# Off-Nadir Delta

> AI-ready OSINT and satellite GEOINT platform that takes world events from the first report to satellite evidence: where each event happened, whether it could be seen from orbit, and what evidence is still missing — drawing on news, official hazard feeds, open data and satellite imagery. There are three ways to look, distinguished by scope: the Watchfloor (everywhere, today — today's prioritized picture of global risk, so you know where to look now; the latest events up to the previous day are free to browse, and the real-time view of today is on paid plans), the Map (one place, right now — verify an event from space with Sentinel-1 C-band SAR, NISAR L-band SAR, Sentinel-2 optical, VIIRS nighttime lights, and NASA FIRMS active fires, no GIS software required), and Delta Watchlist (what you care about, over time — fix an area or follow an event, pick what to count such as ships alongside a berth, a burn index or a water index, and every new Sentinel-1, Sentinel-2, NISAR or VIIRS acquisition over it is measured automatically). And two ways to be told: Delta Agent (an AI analyst that explains what happened and why it matters, and recommends which satellite sensor and area to image next), and Delta Reports (a written daily assessment with Key Judgments, calibrated confidence, and an outlook). The same intelligence is also available programmatically: a REST API and Python SDK expose the signals, the daily brief, satellite scene search, collection planning, the Watchlist and AI analysis to your own stack, and an MCP server gives AI assistants the conversational part (bearer-key auth, token-metered). Built for OSINT, geopolitical-risk, and satellite-intelligence analysts, and for developers integrating live signals and briefs through the API and MCP. Also applicable to emergency management, media, enterprise-risk, and research workflows. Free to browse (the latest events up to the previous day); no GIS software installation required.

**Canonical URL:** https://offnadir-delta.com (non-www)
**Full Documentation:** https://offnadir-delta.com/llms-full.txt

---

## 1. What is Off-Nadir Delta?

Off-Nadir Delta is an AI-ready OSINT and satellite GEOINT platform. Disasters, conflict, environmental change, and infrastructure failures unfold worldwide every day, but the signals are scattered across news, open data, and satellite imagery — and reading them takes expertise and time. Off-Nadir Delta combines an AI analyst, maps, satellite data, and open sources to explore, visualize, and prioritize geographic events, turning them into intelligence for first response and situational awareness — built around five product surfaces, grouped by what you are trying to do. **Watchfloor:** a daily global situational-awareness dashboard — track geolocated conflict, security, disaster and infrastructure events (Delta Signals, drawn from global news media and official hazard feeds), AI-enriched, newest first with a severity score on each (ranked by imaging value on plans that include it). The latest events up to the previous day are free to browse; paid plans add the real-time view of today (narrowed to the last 15 minutes or hour), a chosen date range, and the full detail of each event. Delta Signals is evidence-based: every signal links back to its original sources and an AI-corrected, source-linked location. Where raw open-source feeds often place an event only at country or regional level — or where it was reported from rather than where it happened — Delta resolves it to precise coordinates only as far as the reporting names the place, and drops a location that contradicts the reported country, so you can open, check, and share the evidence behind it. Without an account you can see the previous day's top events and every event on the map; a free account opens every event and its details. **Delta Agent:** an AI intelligence analyst you chat with in plain language — it reasons over live events with real GEOINT/OSINT tradecraft and returns a sourced, geolocated brief that recommends which sensor (SAR or optical) and area to image next; it reads satellite imagery, remembers the conversation, and shows its sources (login required; metered by tokens). **Map:** a no-code satellite-imagery workbench for looking at ONE PLACE RIGHT NOW — stack Sentinel-1 SAR, NISAR L-band SAR, Sentinel-2 optical, VIIRS nighttime lights, and your own data, then run change detection and SAR vessel detection. **Delta Watchlist:** what you care about OVER TIME — fix an area or follow an event, pick what to count (ships alongside a berth, a burn index, a water index, vegetation, nighttime lights), and every new Sentinel-1, Sentinel-2, NISAR or VIIRS acquisition over it is measured automatically, building a time series you return to. Unusual readings are flagged against the area's own recent history using a median-absolute-deviation (MAD) modified z-score (threshold 3.5 over the last 30 measurements, minimum 5) rather than a mean±standard-deviation band, so a single outlier does not move the bar it is judged against. Free plans can watch one place. **Delta Reports:** a written daily intelligence report on world events, produced to professional analytic standards — Key Judgments with calibrated confidence, an outlook, and collection priorities, with an analytic-quality score and PDF export; read any day from a calendar archive. **Developer API & MCP:** the same intelligence is available programmatically — a REST API and an MCP server expose the signals, the daily world brief, satellite scene search, and AI analysis (assess and analyst) for your own dashboards, pipelines, or AI agents, with bearer-key auth, token metering, and cursor pagination; the MCP server works with Claude Code, Claude Desktop, Cursor, VS Code, or any MCP client. On the Watchfloor, Starter adds the real-time view, a chosen date range and what happened — the reported facts, the places and facilities named and the value of every change — and Pro adds the evidence behind it: every source with the report behind each fact and change, the related events, the collection recommendation with the GEOINT score and imagery status, and the market reasoning (the same parts are withheld by plan through the API and on public event pages). AI remote-sensing deep-dives are metered by tokens. No software installation required.

**Built For:** Primarily OSINT, geopolitical-risk, and satellite-intelligence analysts, and developers integrating live signals and briefs through the API and MCP. It also supports workflows such as — no intelligence background required — emergency management and government; journalism and media; risk, supply-chain, and insurance analysis; enterprise asset and supply-chain exposure; environmental research; disaster response; agriculture and agronomy; urban planning; education; and independent analysis.

- [Delta Watchfloor](https://offnadir-delta.com/watchfloor): Daily global situational-awareness dashboard. Every event shows the reports behind it, how precisely it is located (country, town, or street block and facility) and whether it could be seen from orbit; events made from satellite and instrument measurements sit beside the reported ones (free to browse; without an account, the previous day's top events and every event on the map)
- [Delta Agent](https://offnadir-delta.com/agent): Chat with an AI intelligence analyst — sourced, geolocated briefs grounded in real tradecraft, with sensor and area-of-interest tasking recommendations (login required; metered by tokens)
- [Delta Map](https://offnadir-delta.com/map): One place, right now — browser-based satellite-imagery workbench with Sentinel-1 SAR, NISAR L-band SAR, Sentinel-2 optical, VIIRS, change detection and SAR vessel detection (no GIS software)
- [Delta Watchlist](https://offnadir-delta.com/watchlist): One place, over time — put an area under continuous satellite watch and track a number across acquisitions (ships alongside a berth, a burn index, a water index), measured automatically on every new pass, with anomalies flagged against the area's own history. Watch a specific site too — a port, airport or base from the facility registry, or any point — at facility, city or country scale, and be told when something changes there. Events, sites and areas each have their own tab. Readable and configurable over the API and MCP too.
- [Situational Awareness Dashboard](https://offnadir-delta.com/situational-awareness-dashboard): What Delta Watchfloor is and how to track global events with it
- [Global Situation Brief](https://offnadir-delta.com/brief): Daily AI-synthesized OSINT/GEOINT brief of worldwide event signals — headline, executive summary, top developments with why-it-matters and what-to-watch, per-theme roll-up, and ranked signals. Permanent, citeable per-day archive pages at /brief/YYYY-MM-DD (public, updated daily; RSS at /brief/feed.xml)
- [Watchfloor Views](https://offnadir-delta.com/watchfloor/conflict-map): The Watchfloor cut by kind of event or by region at /watchfloor/<view> — the events of the last 7 days that could be placed on the map, each with how precisely it is located, whether it could be seen from orbit and how many outlets reported it: Conflict map (https://offnadir-delta.com/watchfloor/conflict-map), Protest map (https://offnadir-delta.com/watchfloor/protest-map), Maritime incidents map (https://offnadir-delta.com/watchfloor/maritime-incidents-map), Natural disaster map (https://offnadir-delta.com/watchfloor/natural-disaster-map), Infrastructure incidents map (https://offnadir-delta.com/watchfloor/infrastructure-incidents-map), Aviation incidents map (https://offnadir-delta.com/watchfloor/aviation-incidents-map), Middle East conflict map (https://offnadir-delta.com/watchfloor/middle-east-conflict-map), Red Sea events map (https://offnadir-delta.com/watchfloor/red-sea-events-map), Black Sea events map (https://offnadir-delta.com/watchfloor/black-sea-events-map), South China Sea events map (https://offnadir-delta.com/watchfloor/south-china-sea-events-map), Sahel conflict map (https://offnadir-delta.com/watchfloor/sahel-conflict-map). A view with too few events is marked noindex
- [Country Situation Pages](https://offnadir-delta.com/situation/ukraine): Per-country situation monitors at /situation/<country> — geolocated event signals, activity trend and imagery context for 34 countries (e.g. ukraine, russia, united-states, china, japan). Thin pages are marked noindex until they have enough signal
- [Event Pages](https://offnadir-delta.com/events/<event-slug>): One page per tracked event at /events/&lt;event-slug&gt; — what happened, the resolved location (point or area), when it was first reported and last updated, every source article behind it, the satellite observability verdict and recommended sensor, and what imagery could confirm it. Only events reported by at least five distinct outlets (syndication is not collapsed, so this is breadth of reporting, not independent confirmation), with a resolved location, a passed quality check and a place established beyond "reported", are indexed; the rest stay noindex
- [Delta Reports](https://offnadir-delta.com/reports): In-app daily intelligence report viewer — pick any day on a calendar to read that day's report with AI key judgments, an interactive world signal map, satellite-tasking recommendations, and PDF export. Archive depth scales with plan; the public citeable narrative lives at /brief.
- [Event Intelligence API](https://offnadir-delta.com/docs): Build with it — the same signals, imagery search, monitoring and analyst briefs over a REST API and an MCP server, so your own code or AI agent can call them directly (bearer-key auth, token-metered; Python SDK available)
- [What Is a Daily Intelligence Report?](https://offnadir-delta.com/daily-intelligence-report): Explainer — what a daily intelligence report is, what goes into it (Key Judgments, calibrated confidence, outlook, collection priorities, analytic-quality score), and how Off-Nadir Delta produces one daily to professional analytic standards (ICD-203-style tradecraft)
- [About](https://offnadir-delta.com/about): Platform overview and mission
- [About (Markdown)](https://offnadir-delta.com/about.md): Plain text version

---

## 2. Pricing & Constraints

**Pricing Model:** Tokens are deducted by operation. Tile requests, imagery searches, assessments, monitoring runs, and Analyst questions have different costs. Estimated and maximum costs are shown before execution.

| Plan | Status | Best For |
|------|--------|----------|
| Free | Available | Browse the Watchfloor & Delta Agent; Sentinel-1 SAR and Sentinel-2 optical; active fires; terrain; one monitored area; personal use. VIIRS night lights and NISAR can be viewed with a satellite pass paid in tokens (viewing only; token packs can be bought on Free) |
| Starter | Available | VIIRS nighttime lights, NISAR, change detection, export, more monitored areas; the real-time Watchfloor view, a 30-day date range and what happened in each event — the reported facts, places and every change (Free shows the latest events up to the previous day) |
| Pro | Available | Commercial-use license; the evidence behind each event (every source with the report behind each fact, related events, the imaging recommendation with the GEOINT score, market reasoning); unlimited monitoring, full history depth, Delta Agent deep-dives |
| Team / Team Plus | Rolling out | Teams: one shared monthly token pool for the whole org on a single bill (no per-seat wallets); members inherit the plan. Manage from Account → Organization |

History depth counts back from today, but the event record starts on 2026-09-23: no plan reaches events before that date, because none were recorded.

**Pricing and token allocations may change. The Pricing page is the source of truth for current details:**
https://offnadir-delta.com/pricing

**Key Constraints:**
- Typical browsing session: ~20-50 tokens (approx., varies by zoom/area)
- Tokens reset monthly (no rollover)
- Commercial use requires the Pro plan or a Team plan
- Data attribution required (see Data Sources below)

**Learn More:**
- [Pricing](https://offnadir-delta.com/pricing): Plans and feature comparison
- [Token Guide](https://offnadir-delta.com/token-guide): How tokens work, optimization tips

---

## 3. Data Sources & Attribution

- [Data Sources](https://offnadir-delta.com/data-sources): Full reference for every data source — resolution, revisit, bands, and attribution

**Sentinel-1 SAR (Radar)**
- Source: Copernicus Sentinel-1, European Space Agency (ESA)
- Access: Microsoft Planetary Computer STAC API
- License: Copernicus Open Access (free with attribution)
- Citation: "Contains modified Copernicus Sentinel data [YEAR]"

**Sentinel-2 Optical (Multispectral)**
- Source: Copernicus Sentinel-2, European Space Agency (ESA)
- Access: AWS Earth Search STAC API (Element 84)
- License: Copernicus Open Access (free with attribution)
- Citation: "Contains modified Copernicus Sentinel data [YEAR]"

**NISAR L-band SAR (Radar)**
- Source: NISAR, a joint NASA / ISRO mission
- Access: NASA CMR STAC (Alaska Satellite Facility DAAC), collection NISAR_L2_GCOV_PROVISIONAL_V1
- Product: L2 GCOV (geocoded covariance), HH and HV polarizations, 10 m frequency-A grid
- Calibration: PROVISIONAL — backscatter values are indicative, not measured
- Availability: paid plans (Starter and above)
- License: NASA Open Data Policy (free for all uses)
- Citation: "Contains NASA/ISRO NISAR data processed by ASF DAAC"

**VIIRS Nighttime Lights**
- Source: NASA Black Marble VJ146A2 (VIIRS on NOAA-20, from 2019-08-28); VNP46A2 (Suomi NPP archive, from 2012-01-19) for earlier dates
- Access: NASA CMR API
- License: NASA Open Data Policy (free for all uses)
- Citation: "NASA Black Marble VJ146A2 (NOAA-20); VNP46A2 (Suomi NPP) for dates before 2019-08-28"

**NASA FIRMS Active Fire**
- Source: NASA FIRMS (Fire Information for Resource Management System)
- Access: NASA GIBS WMS (no API key required)
- Sensors: VIIRS (NOAA-20 by default, NOAA-21; S-NPP for dates up to 2026-10-31 — NOAA ends S-NPP data distribution on 2026-11-01) at 375m; MODIS (Terra, Aqua) at 1km
- License: NASA Open Data Policy (free for all uses)
- Update frequency: Daily (VIIRS ~12h latency, MODIS ~1-2 day latency)

**Data Specifications:**
| Satellite | Type | Resolution | Revisit | Archive |
|-----------|------|------------|---------|---------|
| Sentinel-1 | SAR (Radar) | 10-20m | 6 days | 2014-present |
| Sentinel-2 | Optical | 10m | 5 days | 2015-present |
| NISAR | SAR (Radar, L-band) | 10m | 12-day repeat (~6-day avg revisit) | 2026-present |
| VIIRS | Nighttime Lights | ~500m | Daily | 2012-present |
| VIIRS/MODIS | Active Fire (FIRMS) | 375m/1km | Daily | 2000-present |

---

## 4. Key Features

- [Sentinel-1 SAR Viewer](https://offnadir-delta.com/sentinel-1-sar-viewer): Live map of recent radar passes (no login), cloud-penetrating, flood mapping
- [NISAR L-Band Viewer](https://offnadir-delta.com/nisar-l-band-viewer): View NASA-ISRO NISAR L-band radar (HH/HV, 10 m, provisional calibration) — sees flooding and structure beneath vegetation canopy that C-band cannot reach
- [Sentinel-2 Viewer](https://offnadir-delta.com/sentinel-2-viewer): Live map of recent natural-color passes (no login), 10m optical imagery, vegetation analysis
- [NDVI Online](https://offnadir-delta.com/ndvi-online): Live global NDVI browse map on-page (VIIRS 8-day, MODIS archive since 2000; no login) + 10m Sentinel-2 NDVI in the workspace
- [Change Detection](https://offnadir-delta.com/change-detection): Multi-temporal comparison and difference analysis
- [Nighttime Lights](https://offnadir-delta.com/nighttime-lights-map): VIIRS Black Marble, urban analysis
- [Flood Mapping](https://offnadir-delta.com/flood-mapping-sar): SAR-based disaster response
- [Ship Monitoring](https://offnadir-delta.com/ship-monitoring): Maritime vessel detection
- [Ship Detection Algorithms](https://offnadir-delta.com/ship-detection-algorithms): Why two SAR ship detections of the same water disagree — the land mask (coastline source and shoreline buffer), not the detector, is usually what changes a coastal vessel count. Includes a measured Natural Earth 10m vs OpenStreetMap coastline comparison over Tokyo Bay (121 m mean displacement, 2026-08-06) and the buffer trade-off table. Every run records algorithm version, release, parameter profile and a configuration hash, so counts can be checked for comparability
- [Free GeoTIFF Viewer](https://offnadir-delta.com/geotiff-upload): View GeoTIFF files instantly in the browser — 100% client-side, file never uploaded, no login
- [Reference Layers](https://offnadir-delta.com/reference-layers): Basemaps and overlays
- [Measured Events](https://offnadir-delta.com/measured-events): Events made from instrument data or an official record instead of news reporting — a satellite measurement, published ship counts, a seismic record or an official forecast. Each kind has its own mark and category on the Watchfloor map; the title and summary are written by a fixed rule, not rewritten by a language model; each is kept as its own event, states what was recorded and never a cause. The hub for the six kinds: Thermal Anomalies, Transit Anomalies, Night-Light Anomalies, SO2 Anomalies, Earthquakes Near Facilities (a seismic record matched to registered facilities, not a measurement by this product) and Cyclone Wind Exposure (an official forecast wind field over registered places, not a measurement).
- [Thermal Anomalies](https://offnadir-delta.com/thermal-anomalies): Heat sources measured by satellite that are far above the recent level of the same spot — near registered facilities (refineries, power plants, ports, bases), and strong isolated ones at night. A measurement, not a report: each record gives the strength, the earlier level, the satellites and the facility, and never a cause. On the Watchfloor map, linked to reporting that names the same facility, and over GET /api/v1/thermal-anomalies
- [Transit Anomalies](https://offnadir-delta.com/transit-anomalies): When the number of ships passing a strait or canal leaves its own usual level — at 28 places including the Strait of Hormuz, the Suez Canal, Bab el-Mandeb, the Strait of Malacca, the Bosporus, the Panama Canal and the Taiwan Strait. A measurement, not a report: each record gives the place, the direction and the change against the usual level, and never a cause. The underlying measurements are updated weekly, so a change shows 4 to 11 days after it happens. On the Watchfloor map as ship marks, watchable from each place's card, and over GET /api/v1/transit-anomalies as an index (usual level = 100), not ship counts
- [Night-Light Anomalies](https://offnadir-delta.com/night-light-anomalies): Nights on which the satellite-measured night lights over a city (NASA Black Marble, VIIRS Day/Night Band on NOAA-20) were below half of that city's own usual level, judged only when at least 70% of the city's area could be observed. A fixed list of cities. A measurement, not a report: it states the percentage, the night and how much of the city was observed, and never a cause — not a confirmed blackout. Recent nights are provisional. On the Watchfloor map as crescent marks, and over GET /api/v1/nightlight-anomalies. The monitored cities are also drawn on the Watchfloor map whether or not they have a record (Layers: Night lights), each with its latest judged night as a share of its own usual level; the same list is in the `cities` field of that endpoint
- [SO2 Anomalies](https://offnadir-delta.com/so2-anomalies): Days on which Sentinel-5P measured sulfur dioxide clearly above the local background around a volcano that has a current volcanic ash advisory — the pixels near the volcano against the ring around them in the same overpass. A measurement, not a report: it states the observation time, the largest column and how many pixels stood out, not the size of an eruption and not whether ash was present. On the Watchfloor map, and over GET /api/v1/so2-anomalies. Contains modified Copernicus Sentinel-5P data
- [Earthquakes Near Facilities](https://offnadir-delta.com/earthquakes-near-facilities): U.S. Geological Survey earthquake records with a registered facility (port, airport, base, energy or nuclear site, dam, bridge) close to the epicentre — within 25 km for magnitude 5.0 or more, 50 km for 5.5 or more, 100 km for 6.5 or more, at a depth of 70 km or less. A seismic record and distances, not a measurement of shaking and not a damage assessment. On the Watchfloor map, and over GET /api/v1/quake-exposures
- [Cyclone Wind Exposure](https://offnadir-delta.com/cyclone-wind-exposure): The registered facilities and straits inside the 34-knot (tropical-storm-force) wind radii of a U.S. National Hurricane Center forecast advisory, now or at a forecast position within 48 hours; one record per storm, updated with each advisory. Atlantic, eastern Pacific and central Pacific only. A forecast applied to a registry — not an observation of wind or damage, and not an official forecast or warning. On the Watchfloor map, and over GET /api/v1/cyclone-exposures
- [Live Active Fire Map](https://offnadir-delta.com/active-fire-map): Interactive NASA FIRMS fire map directly on the page — no login, no API key, dates back to 2000
- [Delta Watchlist](https://offnadir-delta.com/watchlist): Time-series monitoring of any area, measured on every new satellite pass, with automatic anomaly detection
- [Satellite Area Monitoring (Guide)](https://offnadir-delta.com/satellite-area-monitoring): What area monitoring is and how to monitor any area with satellite time series, no GIS or code
- [No-Code Google Earth Engine Alternative](https://offnadir-delta.com/google-earth-engine-alternative): Monitor areas with satellite imagery in the browser without writing code
- [Monitor an Area Without QGIS](https://offnadir-delta.com/monitor-area-without-qgis): No-install, browser-based alternative to desktop GIS for area monitoring
- [Delta Watchlist (Markdown)](https://offnadir-delta.com/watchlist.md): Full feature reference with supported indices, workflow, and FAQ

---

## 5. Getting Started

- [Getting Started Guide](https://offnadir-delta.com/guide): Step-by-step tutorial
- [Guide (Markdown)](https://offnadir-delta.com/guide.md): Plain text version

### For developers & AI agents (API + MCP)

Off-Nadir Delta exposes the same intelligence programmatically over a REST API and an MCP (Model Context Protocol) server. All endpoints live under `/api/v1`, authenticate with a bearer API key (`Authorization: Bearer ond_...`), and are metered on your token balance. REST endpoints: `GET /api/v1/signals` (geolocated world event signals, cursor-paginated — follow `meta.next_cursor` to read every matching signal; the filters are the app's own, with the same choices — the Watchfloor's date range (`start_date`/`end_date`) or time window (`recency` 15m/1h/24h, default 24h), `categories`, free-text search `q` (every word must match, `"phrase"` keeps the order, `-word` excludes), `stages`, `min_severity_band` (4/6/9), `min_publishers` (2/3/5), `min_impact` (Delta Impact Scale level 1–5; events with no level are left out), `reach` (local/regional/international), `threat_vector` (aerial/ground/maritime/cyber/economic/political), `confirmation` (reported/claimed/disputed), `observable_from_orbit`, `sequences_only` (only the events that bring together several separate incidents; every plan), `markets`, `placement` (all/map/list) and `linked_to` (only the events that share one actor, named place or registry facility — the Watchfloor's "Filter to these events"), `watch_id` (only the events linked to one of your watches — the Watchfloor's "Near my places" for one place); sort by latest/oldest/geoint (latest by default; geoint = imaging value); a parameter the app does not offer is refused with 400 naming its replacement), `GET /api/v1/signals/{id}` (fetch one signal by its id), Each signal reports how precisely its place is established (`stage`: reported / localized / pinpointed, with `stage_reason` saying why it is not finer), whether a satellite could see it (`collection.observable`, with `observable_reason`), the breadth of reporting as the number of distinct outlets (`reporting.distinct_hosts` — syndication is not collapsed, so this is not a count of independent sources) and the best NATO grading of its reports (`reporting.source_reliability_best` / `reporting.credibility_best`), `GET /api/v1/collection/plan` (the deterministic SAR+optical imagery plan for one event — each collection searched exactly once against the event footprint), `GET /api/v1/collection/priority` (where observation is most worthwhile and what class of satellite it needs — separates targets a free Sentinel pass answers from those needing commercial sub-metre tasking), `GET /api/v1/collection/observability` (exhaustive survey of which events a given sensor can actually resolve), `GET /api/v1/passes` (next satellite passes over a target — free systematic Sentinel/Landsat/NISAR acquisitions separated from taskable commercial access windows for WorldView/ICEYE/Capella/SkySat/Umbra/Synspective/iQPS/RADARSAT-2/COSMO-SkyMed, with off-nadir angle, sunlit flag and orbital-element age), `GET /api/v1/imagery` (satellite imagery catalog search — Sentinel-1, Sentinel-2 and NISAR L-band scenes over an area, the natural follow-up to a signal), `GET /api/v1/brief` (the AI-synthesized World Brief, free of tokens — `period=daily` on every plan for the days inside the plan's history window (the same window as the app's Reports), `weekly` and `monthly` roundups included by plan; category and location counts cover every event in the period), `GET /api/v1/elevation` (terrain height at a point or over an area — free; POST for a polygon), `GET /api/v1/terrain` (analysis derived from the terrain — free: SAR layover/shadow fractions over an area for a given incidence and look direction, and the ground profile plus a line-of-sight verdict between two points), `POST /api/v1/index-series` (spectral-index time series over an area, measured scene by scene back through the Sentinel-2 archive — how NDVI/NBR/NDWI and the rest moved since a given year; metered per scene actually measured, and `estimate_only` returns the scene count, real date span and cost for free first), `POST /api/v1/ships` (count vessel-like targets in one Sentinel-1 or NISAR L-band scene over an area using CFAR detection — radar sees through cloud and at night; the response carries the caveats that change what the count means, such as an unavailable land mask or a scene covering only part of the area), `GET /api/v1/layer-sets` + `GET /api/v1/layer-sets/{layerSetId}` (the named map configurations saved on your account — what each holds, its tags, and when it was last opened; free), `GET /api/v1/uploads` (the data you uploaded to the map and the formats the uploader accepts — free), `GET /api/v1/usage` (remaining token balance and plan capabilities — free), `GET|POST /api/v1/satellite-pass` (the satellite pass: view VIIRS night lights and NISAR for a fixed period on a plan without them, paid in tokens; viewing only — not monitoring or ship detection; reading is free), `GET /api/v1/status` (data freshness & pipeline status — free), `GET /api/v1/version` (server version and contract fingerprints — free, no API key needed), `POST /api/v1/assess` (AI remote-sensing assessment of one event; signals with no satellite-observable physical mark are rejected before any charge), `POST /api/v1/analyst` (agentic OSINT/GEOINT analyst brief with citations; durable async — the run is enqueued and returns 202 with a job_id immediately, executed by a background worker and charged once on completion), `GET /api/v1/analyst/{jobId}` (poll an async analyst run — free), `GET /api/v1/standing-orders` + `POST /api/v1/standing-orders` (put an area under continuous watch — the app's "Watch this area": takes only `bbox`, `name` and `notify_email` and is checked weekly; free to create; a deterministic pass decides whether new events crossed the reporting bar, and an order created this way reports those events without invoking a model, so its checks cost nothing (orders created before 2026-09-28 with a question still run the Analyst when they fire, metered); an order is paused or stopped through the Watch it is bound to — `PATCH` / `DELETE /api/v1/watches/{watchId}`), `GET /api/v1/monitoring` + `POST /api/v1/monitoring` (Delta Watchlist measurements — fix a place and a quantity, and every new Sentinel-1/2 or VIIRS acquisition over it is measured automatically; free to create and to read, metered only per scene actually measured), `GET /api/v1/monitoring/{areaId}` (the full measurement time series for one area, every point traceable to its STAC item — free), `GET /api/v1/thermal-anomalies` (thermal anomalies: heat sources measured by satellite — VIIRS via NASA FIRMS — near registered facilities such as refineries, power plants and ports, and strong isolated ones at night away from any facility (that kind does not rule out vegetation fires) — each far above the strongest detection at the same spot in the three weeks before; a measurement, not a report — it states strength, time, satellite, the facility and the distance, and never a cause; every record is also an event, also returned by `GET /api/v1/signals?categories=thermal_anomaly` with `measured: true`; same cost and plan window as a page of signals), `GET /api/v1/transit-anomalies` (transit anomalies: for every strait and canal where ship transits are measured — 28 places including Hormuz, Suez, Bab el-Mandeb, Malacca, the Bosporus and Panama — whether the 7-day average of transits is within its usual range, and its level as an index computed by this product with the usual level set to 100; ship counts are not returned; a place outside its usual range carries since when and the event recorded for it, also returned by `GET /api/v1/signals?categories=transit_anomaly` with `measured: true`; a measurement, not a report — it states that the number of ships changed and never why; the measurements are updated weekly, so a change becomes visible 4 to 11 days after it happens; takes no parameters; same cost as a page of signals. Sources: UN Global Platform; IMF PortWatch (portwatch.imf.org)), `GET /api/v1/nightlight-anomalies` (night-light anomalies: nights on which the satellite-measured lights over a listed city were below half of the city's own usual level; a measurement, not a report — never a cause; the response also lists every monitored city in `cities`, anomaly or not, with its status and its recent nights as a share of the city's own usual level — the level needs a plan with the full event detail, and brightness values are never returned), `GET /api/v1/so2-anomalies` (SO2 anomalies: sulfur dioxide measured by Sentinel-5P clearly above the local background around a volcano with a current volcanic ash advisory; not the size of an eruption, and not whether ash was present), `GET /api/v1/quake-exposures` (earthquakes near facilities: U.S. Geological Survey earthquake records with registered facilities within a magnitude-dependent distance of the epicentre; a seismic record and distances, not shaking or damage), `GET /api/v1/cyclone-exposures` (cyclone wind exposure: registered facilities and straits inside the tropical-storm-force wind radii of a U.S. National Hurricane Center forecast advisory, now or within 48 hours; Atlantic, eastern Pacific and central Pacific; a forecast, not an observation) — every record of these four is also an event, returned by `GET /api/v1/signals` with `categories=nightlight_anomaly`, `so2_anomaly`, `quake_exposure` or `cyclone_exposure` and `measured: true`, `GET /api/v1/entities` + `GET /api/v1/entities/{entityId}` (the location registry — civil airports, military and naval bases, launch sites, nuclear facilities, ports, power plants, major dams, bridges and government sites, chokepoints and named seas, searchable by name in many languages and by IATA/ICAO code, and the most recent events linked to each; every event link states whether the reporting NAMED the place as where it happened, named it as the target, or the event was only located within range of it, so an association is never mistaken for a location claim — 1 token per lookup, no bulk export), `GET /api/v1/reference` (what a named place, facility or actor is, quoted from Wikipedia with its attribution — the article summary, infobox lines and one photo whose licence could be read; never assessed, and a missing article is reported as missing rather than as unimportant; free on Starter and above; REST only, not an MCP tool), `GET /api/v1/events/{eventId}/related` (the relations recorded for one event — nothing is inferred on request: other events linked to the same registry facility, naming the same place resolved to a town or finer, or stored as the same campaign, each saying what it shares, plus reports of the same event merged into it; events that are merely nearby are not relations and are not returned — 1 token), `GET /api/v1/watches` + `POST /api/v1/watches` + `GET /api/v1/watches/{watchId}` + `PATCH /api/v1/watches/{watchId}` + `DELETE /api/v1/watches/{watchId}` + `POST /api/v1/watches/{watchId}/notes` + `DELETE /api/v1/watches/{watchId}/notes/{noteId}` (the Watchlist — everything under watch, in three kinds: events, sites and areas. A SITE is a registry facility or any point watched for change at facility, city or country scale, from satellite measurements around it and the events linked to it. One list, one entry per target with a state bucket and the latest meaningful change; watch a canonical real-world event or save an area; PATCH (MCP: `update_watch`) pauses/resumes and propagates to the bound monitoring, and for a saved AREA it can turn on new-scene alerts (`imagery_alerts`) — you are told when a new Sentinel-1/2 scene covers the area, which reports that a look is now possible and not what is in it; DELETE removes the watch and its bound resources; free, except `include_passes` on GET which adds the collection outlook and costs the same as `/api/v1/passes`; a watch can also be written on — append-only notes kept against it, where a title starts a thread others can reply to and a note carrying a confidence is a judgment that supersedes the previous one), `GET /api/v1/notifications` + `POST /api/v1/notifications/read` (the Notification Center — every change a watch reported, one row each with read state: an event development, a newly related event, an anomaly, a new event at a site, a new scene, a fired standing order; the same list as the bell in the app; filter by `unread_only`, `kind` or `watch_id`; a value the plan does not open is marked `locked` with the plan that opens it; mark read by `ids` or `all`; free), `GET`/`DELETE /api/v1/notification-channel` and `POST /api/v1/notification-channel/test` (the channel watch notifications are delivered to besides the app and email — one per account: a Slack or Discord channel, connected in the app through Slack’s or Discord’s own consent screen, or a signed webhook; which watches deliver there is `notify_chat` on each watch; the URL and signing secret are never returned; free), `POST /api/v1/notification-channel/webhook` (register an https webhook; every delivery is a JSON POST signed with HMAC-SHA256 in `X-Delta-Signature: t=<unix>,v1=<hex>`; the signing secret is returned once; free), `POST /api/v1/notification-channel/replay` (re-deliver missed notifications to the webhook, up to 7 days per call; free), `GET /api/v1/developments` (what actually CHANGED about the events in an area — new events and updates to events already reported, told apart, each with what the value was and what it became; polling `/signals` and diffing the ids finds new REPORTING, which is a different thing; token-metered like `/signals`), `GET /api/v1/events/{eventId}/thread` (one event end to end — its current state, when it HAPPENED as distinct from when it was reported, the condition of each named site as the latest report describing that site states it, every change in order, and every source article behind it — free — and, for an event made of several separate incidents, those incidents (`sequence.children`, each with its severity band, and `sequence.highest_severity_band` — the most severe incident, never a sum), or for one incident the event it belongs to (`sequence.parents`) and the other incidents (`sequence.siblings`), and any measurement recorded at the same place close in time (`measured_same_place` — a heat source at the same facility, a transit change at the same strait, SO2 over the same volcano, a quake or cyclone at the same site; stored by fixed rules, never a confirmation)). The MCP server (Streamable HTTP at `/api/v1/mcp`) serves the tools meant for a conversation: `query_signals` / `get_event_thread` / `query_developments` / `get_world_brief` / `search_imagery` / `plan_event_imagery` / `rank_imaging_priority` / `predict_satellite_passes` / `assess_signal` / `ask_analyst` / `get_analyst_job` / `list_watches` / `list_notifications` / `get_watch` / `create_watch` / `update_watch` / `delete_watch` / `add_note` / `search_entities` / `get_entity` / `get_related_events` / `get_usage`, and resources `brief://latest` / `brief://{date}` / `signals://schema` / `usage://current` / `status://current` / `watch://{watch_id}`. Its list results are digests on small pages (`query_signals` at most 50 rows, `search_imagery` at most 25 scenes without per-band asset links) and each carries `full_records` — the same query as a REST URL and a Python SDK call, for every field and pages of up to 500. Monitored areas, standing orders, saved layer sets and uploads, elevation, terrain, index series, ship detection, note deletion, marking notifications read and the observability survey are on the REST API and the Python SDK only; calling their former MCP tool names returns `code: api_only` with the REST operation to use. Machine-readable OpenAPI 3.1 at `/api/v1/openapi.json`. Available on every plan including Free — metering is against your token balance (`get_world_brief` and `get_usage` are free). Two surfaces additionally carry a per-plan count limit: how many standing orders you may have running (Free: one) and how many monitored areas you may keep (Free: one). On Free, the event filters beyond category — `q`, `stages`, `min_severity_band`, `min_impact`, `reach`, `threat_vector`, `confirmation`, `observable_from_orbit`, `min_publishers`, `markets` and `placement` on `/signals` — are not applied, and `meta.filter_clamp` names the ones dropped; category, bbox and the time window work on every plan. For teams, a Team plan gives the whole organization one shared token pool: every member's API and MCP usage draws from the same wallet on a single bill (managed at Account → Organization).

API metering in Delta tokens (map tiles are metered separately, by pixels, bands and processing type — see /token-guide): signals search 1 per 10 rows returned (minimum 3 per request; the measured-event readers and developments follow the same rule), signal by id 1, imagery search 2, collection plan 4, imaging priority 1, observability survey 1, satellite passes 2 per call; AI tools are assess_signal 5 (quick) / 15 (deep) and ask_analyst usage-based from 5 up to a promised ceiling (123 fast / 415 deep), charged once on completion — an empty or unusable result is not charged. Brief, usage, status, version, standing-order management and job polling are free. The authoritative machine-readable price list is `_meta.pricing_contract`, attached to every MCP response; current values are always at https://offnadir-delta.com/docs/api.

- [Developers — overview](https://offnadir-delta.com/docs): Start here — what you can pull, how to connect (REST API, Python SDK, MCP server, GPT Actions), the quickstart and the open-source Python SDK (Apache-2.0; typed models, sync and async clients, auto-pagination)
- [REST API reference](https://offnadir-delta.com/docs/api): Every endpoint under /api/v1 — parameters, example requests/responses, authentication, rate limits, pagination, errors, and the OpenAPI specs
- [MCP server & AI agents](https://offnadir-delta.com/docs/mcp): The MCP server for AI agents (OAuth 2.1 or API key; setup for claude.ai, ChatGPT, Claude Code, Claude Desktop, Cursor, VS Code; the tools and resources; demo prompts), instructions for agents that run code (use the Python SDK), and GPT Actions for a ChatGPT custom GPT (`/api/v1/openapi-gpt-actions.json`)
- [API Playground](https://offnadir-delta.com/docs/playground): Run real v1 API requests in the browser with your own key — grouped endpoint forms, live JSON response, rate-limit headers, and matching cURL / Python / TypeScript snippets
- [Runnable examples (GitHub)](https://github.com/Off-Nadir-Lab/offnadir-delta-examples): Clone-and-run Python programs for the API and MCP server (Apache-2.0) — first query, collection tasking loop, cursor pagination with a client-side count by category, concurrent signals + imagery, AI assess/analyst, and direct MCP tool calls
- [Delta Recipes](https://offnadir-delta.com/docs/recipes): One workflow, four ways to run it (web app / REST / Python / MCP) — first query (https://offnadir-delta.com/docs/recipes/first-signals-query), collection tasking loop (https://offnadir-delta.com/docs/recipes/collection-tasking-loop), cursor pagination (https://offnadir-delta.com/docs/recipes/paginate-and-aggregate), concurrent signals + imagery (https://offnadir-delta.com/docs/recipes/concurrent-signals-imagery), AI assess & analyst (https://offnadir-delta.com/docs/recipes/assess-and-analyst), MCP from Python (https://offnadir-delta.com/docs/recipes/mcp-from-python), daily situation briefing (https://offnadir-delta.com/docs/recipes/daily-situation-briefing), assess the top signal (https://offnadir-delta.com/docs/recipes/assess-top-signal), AOI watch (https://offnadir-delta.com/docs/recipes/aoi-watch), changes pushed to your own system by signed webhook (https://offnadir-delta.com/docs/recipes/webhook-watch-alerts), market exposure check (https://offnadir-delta.com/docs/recipes/market-exposure-check)

**Quick Start:**
1. Sign up free at https://offnadir-delta.com/auth/signup
2. Navigate to your area of interest
3. Select satellite data source (Sentinel-1/2, NISAR, VIIRS)
4. Search by date range
5. Add imagery to map
6. Analyze and export

---

## 6. Glossary & Technical Terms

- [Glossary](https://offnadir-delta.com/glossary): Full terminology reference

**Key Terms:**
- **SAR**: Synthetic Aperture Radar - works through clouds, day/night
- **NDVI**: Vegetation health index (-1 to +1)
- **GRD**: Ground Range Detected SAR product
- **RTC**: Radiometrically Terrain Corrected SAR
- **COG**: Cloud Optimized GeoTIFF
- **STAC**: SpatioTemporal Asset Catalog API standard

---

## 7. FAQ

- [FAQ](https://offnadir-delta.com/faq): Detailed answers on satellite data, tokens, plans, and platform usage
- [FAQ (Markdown)](https://offnadir-delta.com/faq.md): Plain text version
- [Active Fire Map (Markdown)](https://offnadir-delta.com/active-fire-map.md): FIRMS sensor specs and usage guide

**Common Questions:**
- **Why use Off-Nadir Delta if I already have ChatGPT or Claude?** A general AI assistant reads what it can fetch at the moment you ask, inside one context window, and does not keep a running record of the events once the conversation ends. Off-Nadir Delta reads continuously whether or not anyone asks: in the 24 hours to 19 October 2026 it took in 15,122 articles, about 45 million characters of text — more than ten 1M-token context windows. It folds reports of the same event into one record, keeps what changed with the source behind each change, places each event only as precisely as the reporting allows and says whether a satellite could check it, and records events that never reach the news, such as satellite-measured heat sources and changes in ship transits through straits. It does not replace your assistant: connect Delta over MCP or the REST API, and the assistant reasons over these records instead of re-reading the news. The reasoning and the measurements: https://offnadir-delta.com/blog/why-use-event-intelligence-when-you-have-chatgpt-or-claude
- **Is it free?** Yes, free tier available. Paid plans add more tokens; the Pro and Team plans add commercial use.
- **Do I need GIS experience?** No, designed for beginners.
- **What browsers work?** Chrome, Firefox, Edge, Safari (Chrome/Firefox recommended).
- **Can I upload my data?** Yes, GeoTIFF and GeoJSON supported.
- **Does fire data need an API key?** No. NASA FIRMS is displayed via GIBS WMS, free and keyless.
- **Does fire data use tokens?** No. FIRMS overlay is free, no token cost.
- **What is a measured event on Off-Nadir Delta?** An event made from instrument data or an official record instead of news reporting. It has its own mark and category on the map, its text is written by a fixed rule, and it states what was recorded and never a cause. The kinds and their limits: https://offnadir-delta.com/measured-events
- **What is a thermal anomaly on Off-Nadir Delta?** A heat source a satellite measured (NASA FIRMS VIIRS 375 m) that is far above the recent level of the same spot, so a flare that burns every night does not count. Definition, limits and API: https://offnadir-delta.com/thermal-anomalies
- **Is there a thermal anomaly API?** Yes: GET /api/v1/thermal-anomalies (and client.thermal_anomalies in the Python SDK). Every plan gets the time, position and kind; the facility, strength and linked reporting need a plan with the full event detail.
- **What is a transit anomaly on Off-Nadir Delta?** A record that the 7-day average of ships passing a strait or canal left its own usual level (the median of the 7-day averages over the 12 weeks before). It states that the number changed, not why, and it shows days after the change, not hours. Definition, limits and API: https://offnadir-delta.com/transit-anomalies
- **Is there a transit anomaly API?** Yes: GET /api/v1/transit-anomalies (and client.transit_anomalies in the Python SDK). Every plan gets each place, its status and since when it has been outside its usual range; the index and the change need a plan with the full event detail. Ship counts are not returned.
- **What is a night-light anomaly on Off-Nadir Delta?** A record that the satellite-measured night lights over a listed city were below half of that city's own usual level on a night when at least 70% of the city could be observed. It states that the light fell, not why; it is not a confirmed blackout. Definition and limits: https://offnadir-delta.com/night-light-anomalies
- **What is an SO2 anomaly on Off-Nadir Delta?** A record that Sentinel-5P measured sulfur dioxide clearly above the local background around a volcano with a current volcanic ash advisory. It does not give the size of an eruption or whether ash was present. Definition and limits: https://offnadir-delta.com/so2-anomalies
- **Does Off-Nadir Delta show earthquakes near ports, plants or bases?** Yes: a U.S. Geological Survey earthquake record with a registered facility within a magnitude-dependent distance of the epicentre is recorded as an event, with the distance to each facility. It does not say a facility was shaken or damaged. Definition and limits: https://offnadir-delta.com/earthquakes-near-facilities
- **Does Off-Nadir Delta show which facilities are in a hurricane's wind field?** For the Atlantic, eastern Pacific and central Pacific: the registered facilities and straits inside the 34-knot wind radii of a U.S. National Hurricane Center forecast advisory, now or within 48 hours. It is a forecast, not an observation, and not an official warning. Definition and limits: https://offnadir-delta.com/cyclone-wind-exposure
- **Is there an API for these four kinds?** They are events: GET /api/v1/signals with categories=nightlight_anomaly, so2_anomaly, quake_exposure or cyclone_exposure returns them with measured: true. Readers per kind are GET /api/v1/nightlight-anomalies, /api/v1/so2-anomalies, /api/v1/quake-exposures and /api/v1/cyclone-exposures (client.nightlight_anomalies, client.so2_anomalies, client.quake_exposures and client.cyclone_exposures in the Python SDK). Every plan gets that a record exists, its kind, time and position; which city, volcano, facilities or storm and the values need a plan with the full event detail.
- **Where can I view NASA FIRMS fires online for free?** The live map at https://offnadir-delta.com/active-fire-map — no login or API key required.
- **Is there a free online GeoTIFF viewer?** Yes: https://offnadir-delta.com/geotiff-upload parses .tif files entirely in the browser; nothing is uploaded to a server.
- **Can Off-Nadir Delta alert my own system when something changes?** Yes. Changes on your Watchlist (a facility or any point, an area, or an event) are checked every hour and delivered in the app and by email, and — one channel per account — to Slack, Discord or a signed webhook of your own. A webhook delivery is a JSON POST signed with HMAC-SHA256 (`X-Delta-Signature` over the timestamp and the raw body); each change says what moved, with its value before and after where your plan includes it, and missed deliveries can be replayed (up to 7 days per call). Connecting a channel is free. Walkthrough with a verifying receiver: https://offnadir-delta.com/docs/recipes/webhook-watch-alerts
- **Is it real-time?** Not to the second: watch changes are checked every hour, and a satellite measurement can only come after the next pass over the place.

---

## 8. Use Cases

- [Use Cases](https://offnadir-delta.com/use-cases): Nine real-world applications — geopolitical & supply-chain risk, maritime domain awareness, disaster response, environmental & crop monitoring, urban planning, nighttime lights, research/education, and API/MCP access for developers and AI agents
- [Best OSINT Satellite Imagery Tools](https://offnadir-delta.com/best-osint-satellite-imagery-tools): Honest comparison, by use (not a ranking), of the main OSINT satellite imagery tools (Copernicus Browser, Sentinel Hub, NASA Worldview, USGS EarthExplorer, Google Earth Pro, Planet, Vantor/Maxar, SkyFi, Bellingcat toolkit, GDELT/ACLED/LiveUAMap) with an at-a-glance comparison table, and where Off-Nadir Delta fits
- [OSINT & Risk](https://offnadir-delta.com/osint-satellite-intelligence): Geospatial OSINT, geopolitical and security risk, and news verification in one workflow — discover events from global news media and official hazard feeds, see how precisely each is located (reported / localized / pinpointed) and how widely and how reliably it is reported (distinct outlets, NATO source grading, change history), check whether it could be seen from orbit and when it can next be imaged, keep watch on events, areas and facilities, and cite the public event page. Sections for risk teams (#risk) and for journalists and fact-checkers (#verification)
- [Geospatial Intelligence (GEOINT)](https://offnadir-delta.com/geospatial-intelligence): What GEOINT is and how it differs from OSINT and remote sensing — open-source geospatial intelligence in the browser, from geolocated event to Sentinel SAR/optical confirmation
- [AI Satellite Imagery Analysis](https://offnadir-delta.com/ai-satellite-analysis): How AI analyzes satellite imagery — Delta Agent as a reasoning intelligence analyst plus pixel-level change detection and SAR vessel detection, on open Sentinel data
- [Defense & Collection Planning](https://offnadir-delta.com/defense-satellite-intelligence): Open-source, unclassified GEOINT for defense and security analysts and collection managers — where imaging is worth it and with what class of sensor, the SAR + optical plan for one event, when a place can next be imaged by 13 satellite families (free systematic vs commercial taskable), terrain (SAR layover/shadow, line of sight), sourced briefs, and facility-scale watches. Decision support, not targeting
- [Maritime Domain Awareness](https://offnadir-delta.com/maritime-domain-awareness): Watch a port or chokepoint from the facility registry as a site on the Watchlist, count vessel-like targets in each new Sentinel-1 (or NISAR, on plans that include it) SAR pass with caveats stated, flag counts that depart from the place's own history, tie maritime events to the facility, and see the next SAR pass. SAR detects radar returns, not vessel identity; AIS is not ingested
- [Liveuamap Alternative](https://offnadir-delta.com/liveuamap-alternative): A global events map that adds analyzable Sentinel SAR/optical imagery, an AI analyst, and your own monitored areas — the latest events up to the previous day are free to browse; today in real time is on paid plans
- [Google Earth Pro Alternative](https://offnadir-delta.com/google-earth-pro-alternative): What to use after Google Earth Pro for desktop stops being available for download on June 25, 2027 — Google's own path (Google Earth on the web), QGIS and Copernicus Browser, and where Off-Nadir Delta fits (dated Sentinel-2/Sentinel-1 scenes, terrain, GeoTIFF/GeoJSON upload, area monitoring) with what it does not replace (no Google basemap, 3D globe or KML import); side-by-side table
- [ACLED Alternative](https://offnadir-delta.com/acled-alternative): A complement to ACLED, not a replacement — ACLED's free Open level gives aggregated data (event data depends on access level); Off-Nadir Delta adds recent events machine-read from global news media and official hazard feeds, with place precision, NATO source grading, change history and a satellite-observability check; record starts 2026-09-23, free to browse up to the previous day
- [Satellite Pass Prediction](https://offnadir-delta.com/satellite-pass-prediction): When a place can next be imaged and by which satellite — SGP4 over public orbital elements across free systematic collectors (Sentinel-1, Sentinel-2, NISAR, Landsat) and taskable commercial platforms (WorldView, ICEYE, Capella, SkySat); explains why an access window is not a guaranteed collect, and why look side and incidence decide what a pass can actually measure
- [Best GeoTIFF Viewers](https://offnadir-delta.com/best-geotiff-viewers): QGIS, GDAL, ArcGIS Pro and an in-browser viewer compared by job — install requirement, cost, analysis capability and practical file size; covers COG, the OGC GeoTIFF standard, and why a raster renders black
- [Best Active Fire Maps](https://offnadir-delta.com/best-active-fire-maps): Free live fire maps compared by job (NASA FIRMS, NASA Worldview, EFFIS, Zoom Earth, Off-Nadir Delta) with sensor resolution, coverage, latency and login requirements side by side; explains why a thermal hotspot is not a mapped burn
- [Best Free SAR Viewers](https://offnadir-delta.com/best-free-sar-viewers): Free ways to view Sentinel-1 SAR imagery compared by job (Copernicus Browser, ASF Vertex, Google Earth Engine, Off-Nadir Delta) with account, coding and processing side by side
- [Track World Events With ChatGPT or Claude](https://offnadir-delta.com/ai-assistant-event-tracking): What a general AI assistant can and cannot do with world news on its own (watch a place, say what changed, tell one event from many reprints, check from orbit, see events never reported), how to connect Off-Nadir Delta to Claude or ChatGPT over MCP, and example questions with the tool each one uses
- [Dark Vessel Detection Tools](https://offnadir-delta.com/dark-vessel-detection-tools): Free ways to find vessels that do not broadcast AIS compared by job (Global Fishing Watch, Skylight, Copernicus Browser, Off-Nadir Delta) — what each detects, whether it matches to AIS, which satellites, and whether you can run it on your own area
- [Copernicus Browser Alternative](https://offnadir-delta.com/copernicus-browser-alternative): Where Copernicus Browser (free, official, best for browsing/evalscripts/download) ends and Off-Nadir Delta begins (where-to-look event layer, automated re-measurement on every pass with anomaly alerts, sourced AI brief); side-by-side table
- [EO Browser Alternative](https://offnadir-delta.com/eo-browser-alternative): A no-code browser alternative for viewing and comparing Sentinel-1/2, NISAR, and VIIRS imagery, and for monitoring an area over time
- [Zoom Earth Alternative](https://offnadir-delta.com/zoom-earth-alternative): Beyond live weather imagery — analyzable Sentinel SAR/optical scenes, change detection, and geolocated event context
- [GDELT Visualization Tool](https://offnadir-delta.com/gdelt-visualization-tool): See GDELT world-event data on a map, AI-enriched and geolocated, with satellite imagery over the same place
- [SAR vs Optical](https://offnadir-delta.com/sar-vs-optical): Comparison guide
- [Satellite Area Monitoring (Guide)](https://offnadir-delta.com/satellite-area-monitoring): What area monitoring is and how to do it with satellite time series — the explainer behind the Delta Watchlist

**Applications:**
- Environmental Monitoring: Deforestation, wetlands, vegetation health, long-term NDVI trends
- Disaster Response: Flood mapping, active fire monitoring, wildfire damage, earthquake assessment, post-disaster recovery tracking
- Agriculture: Crop health, irrigation, harvest tracking, seasonal phenology monitoring
- Urban Planning: Sprawl analysis, construction monitoring, built-up index time series
- Maritime: Vessel detection, port activity, continuous ship detection monitoring

**Area Monitoring Feature:**
- Draw or upload a polygon (up to 5,000 km²)
- Select one or more indices to track (NDVI, SAR backscatter, NDWI, DNB, Ship Detection, etc.)
- Set analysis start date; Off-Nadir Delta automatically collects all available scenes
- Results displayed as an interactive time series graph with anomaly detection highlighted
- Click any data point to add that satellite scene to the map
- Change analysis period and re-analyze at any time

---

## 9. Blog

- [Blog](https://offnadir-delta.com/blog): Tutorials, case studies, and technical insights
- [RSS Feed](https://offnadir-delta.com/feed.xml): Subscribe for updates

**All Articles:**
- [What an Event Severity Level Rests On: Public Thresholds and Where They Run Out](https://offnadir-delta.com/blog/what-an-event-severity-score-rests-on): Which public scales define how severe a single event is (USGS PAGER, GDACS, EM-DAT, UCDP, Copernicus EMS), which kinds of events have none, and how the Delta Impact Scale and Delta GEOINT Readiness are built from them
- [Night Lights, SO2, Earthquakes and Cyclones: Four Measured Events and What Each One Can and Cannot Tell You](https://offnadir-delta.com/blog/night-lights-so2-earthquakes-cyclones-measured-events)
- [What Is a Transit Anomaly? Telling an Unusual Change in Ship Traffic at a Strait from Routine Variation](https://offnadir-delta.com/blog/what-is-a-transit-anomaly-ship-traffic-straits-canals)
- [What Is a Thermal Anomaly? Telling an Unusual Heat Source from a Routine Flare in Satellite Data](https://offnadir-delta.com/blog/what-is-a-thermal-anomaly-satellite-heat-sources)
- [How to Verify a Reported Event with Free Satellite Imagery: An OSINT Workflow](https://offnadir-delta.com/blog/verify-reported-event-free-satellite-imagery)
- [How to Find the Most Recent Satellite Image of Any Place](https://offnadir-delta.com/blog/find-most-recent-satellite-image-of-a-place)
- [What Can You Actually See in 10 m Satellite Imagery? An OSINT Guide by Target](https://offnadir-delta.com/blog/what-can-you-see-in-10m-satellite-imagery-osint)
- [Was There a Fire, and When? Confirming and Dating a Reported Fire with Satellite Data](https://offnadir-delta.com/blog/confirm-and-date-a-fire-with-satellite-data)
- [How to Keep Watch on a Facility with Free Satellite Imagery](https://offnadir-delta.com/blog/keep-watch-on-a-facility-with-free-satellite-imagery)
- [Which Satellite Observation Would Actually Refute Your Hypothesis?](https://offnadir-delta.com/blog/which-observation-would-refute-your-hypothesis)
- [Layover and Shadow: How Much of a SAR Scene Is Actually Usable?](https://offnadir-delta.com/blog/sar-layover-shadow-how-much-terrain-is-usable)
- [Watching a Place: Measuring a Number vs Watching for Events](https://offnadir-delta.com/blog/watching-a-place-measurement-vs-events)
- [When Can a Satellite Next Image This Place? Pass Prediction, Explained](https://offnadir-delta.com/blog/when-can-a-satellite-image-this-place)
- [Build a Daily Situation-Briefing Agent with MCP Tools and Area Watch](https://offnadir-delta.com/blog/daily-situation-briefing-agent-mcp)
- [From a World Event to the Satellite Scenes Over It: One API & MCP Workflow](https://offnadir-delta.com/blog/event-to-satellite-imagery-api-mcp-workflow)
- [From News Feed to Intelligence Report: What Key Judgments and Confidence Add](https://offnadir-delta.com/blog/news-feed-to-intelligence-report)
- [How to Give an AI Agent Live World-Event Awareness (MCP + REST API)](https://offnadir-delta.com/blog/ai-agent-world-event-awareness-mcp)
- [How to Connect an Event-Intelligence MCP Server to Claude, ChatGPT, Cursor, and the Command Line](https://offnadir-delta.com/blog/connect-mcp-server-claude-chatgpt-cursor)
- [What Is Off-Nadir Satellite Imagery? Viewing Angle Explained](https://offnadir-delta.com/blog/what-is-off-nadir-satellite-imagery)
- [Unsupervised Anomaly Detection in Satellite Time Series: When AI Learns 'Normal'](https://offnadir-delta.com/blog/unsupervised-anomaly-detection-satellite-time-series)
- [Can AI Read a Satellite Image? The Reasoning Layer Above Pixel Models](https://offnadir-delta.com/blog/ai-reasoning-layer-satellite-imagery)
- [Port Congestion and Supply-Chain Risk: What Satellites See That Shipping Data Misses](https://offnadir-delta.com/blog/port-congestion-supply-chain-risk-satellite)
- [Watching Mines, Tailings Dams, and Industrial Sites from Space: Environmental and Operational Risk](https://offnadir-delta.com/blog/industrial-site-monitoring-environmental-risk-satellite)
- [What Is Geospatial OSINT? Turning Open Sources Into a Picture of the Ground](https://offnadir-delta.com/blog/what-is-geospatial-osint)
- [Why This Sensor? How the Delta Agent Explains Its Imagery-Tasking Choices](https://offnadir-delta.com/blog/delta-agent-sensor-tasking-tradecraft)
- [A Field Guide to Free Satellite Data Sources: Sentinel-1, Sentinel-2, VIIRS, and NASA FIRMS](https://offnadir-delta.com/blog/free-satellite-data-sources-explained)
- [What Is a Situational Awareness Dashboard? Fusing Global Events With Satellite Imagery](https://offnadir-delta.com/blog/situational-awareness-dashboard-satellite-intelligence)
- [Getting Started with Sentinel-1 SAR Imagery](https://offnadir-delta.com/blog/getting-started-sentinel-1-sar)
- [Four Types of Satellite Image Resolution](https://offnadir-delta.com/blog/satellite-image-resolution-four-types)
- [Five Mistakes Satellite Imagery Beginners Make](https://offnadir-delta.com/blog/five-mistakes-satellite-imagery-beginners)
- [Why SAR Can See Through Clouds](https://offnadir-delta.com/blog/why-sar-sees-through-clouds)
- [Understanding NDVI: Vegetation Health from Space](https://offnadir-delta.com/blog/understanding-ndvi-vegetation-health)
- [Flood Mapping with SAR: A Practical Workflow](https://offnadir-delta.com/blog/flood-mapping-with-sar-practical-workflow)
- [How to Read a SAR Image: Bright and Dark Explained](https://offnadir-delta.com/blog/reading-sar-images-practical-guide)
- [Free vs. Commercial Satellite Imagery](https://offnadir-delta.com/blog/free-vs-commercial-satellite-imagery)
- [Beyond True Color: Sentinel-2 Band Combinations](https://offnadir-delta.com/blog/sentinel-2-band-combinations)
- [What Nighttime Lights Tell Us About Cities](https://offnadir-delta.com/blog/nighttime-lights-urban-analysis)
- [Browser-Based WebGIS vs. Desktop GIS](https://offnadir-delta.com/blog/browser-webgis-vs-desktop-gis)
- [Change Detection: Three Approaches That Work](https://offnadir-delta.com/blog/satellite-change-detection-techniques)
- [How to Choose the Right Satellite Data](https://offnadir-delta.com/blog/choosing-satellite-data-decision-guide)
- [SAR Polarization: VV, VH Demystified](https://offnadir-delta.com/blog/sar-polarization-vv-vh-explained)
- [GeoTIFF and Cloud-Optimized GeoTIFF Explained](https://offnadir-delta.com/blog/geotiff-cloud-optimized-explained)
- [SAR vs Optical: A Practical Guide to Choosing the Right Sensor](https://offnadir-delta.com/blog/sar-vs-optical-when-to-use-which)
- [EVI vs NDVI: When NDVI Isn't Enough](https://offnadir-delta.com/blog/evi-vs-ndvi-vegetation-indices)
- [MNDWI and NDWI Explained: Mapping Water Bodies from Space](https://offnadir-delta.com/blog/water-body-detection-ndwi-mndwi)
- [How to Upload and Analyze Your Own GeoTIFF](https://offnadir-delta.com/blog/upload-analyze-geotiff-guide)
- [Satellite Image Difference Analysis: Step-by-Step](https://offnadir-delta.com/blog/difference-analysis-step-by-step)
- [Multi-Temporal SAR Color Composites](https://offnadir-delta.com/blog/multi-temporal-sar-color-composite)
- [Snow and Ice Monitoring with NDSI](https://offnadir-delta.com/blog/snow-ice-monitoring-ndsi)
- [Choosing the Right Colormap for Satellite Data](https://offnadir-delta.com/blog/understanding-satellite-data-colormaps)
- [Geological Mapping: Iron Oxide and Clay Detection](https://offnadir-delta.com/blog/iron-oxide-clay-geological-mapping)
- [Sentinel-1 GRD vs RTC: Which SAR Product to Use](https://offnadir-delta.com/blog/sentinel-1-grd-vs-rtc-comparison)
- [Reference Layers: Adding Context to Satellite Data](https://offnadir-delta.com/blog/reference-layers-context-satellite-data)
- [Active Fire Monitoring with NASA FIRMS](https://offnadir-delta.com/blog/nasa-firms-active-fire-monitoring)
- [What Is Remote Sensing? A Complete Guide](https://offnadir-delta.com/blog/what-is-remote-sensing-complete-guide)
- [How Satellites Capture Images of Earth](https://offnadir-delta.com/blog/how-satellites-capture-images)
- [The Electromagnetic Spectrum in Remote Sensing](https://offnadir-delta.com/blog/electromagnetic-spectrum-remote-sensing)
- [Satellite Orbit Types and Their Impact on Earth Observation](https://offnadir-delta.com/blog/satellite-orbit-types-explained)
- [Radiometric Calibration: From Raw Numbers to Physical Measurements](https://offnadir-delta.com/blog/radiometric-calibration-basics)
- [Supervised vs. Unsupervised Classification of Satellite Imagery](https://offnadir-delta.com/blog/supervised-vs-unsupervised-classification)
- [Atmospheric Correction: Why Raw Satellite Data Lies](https://offnadir-delta.com/blog/atmospheric-correction-why-it-matters)
- [The Complete Guide to Sentinel-2](https://offnadir-delta.com/blog/sentinel-2-complete-guide)
- [Sentinel-2 Cloud Masking Techniques That Actually Work](https://offnadir-delta.com/blog/sentinel-2-cloud-masking-techniques)
- [Sentinel-2 for Water Quality Monitoring](https://offnadir-delta.com/blog/sentinel-2-water-quality-monitoring)
- [False Color Composites: Seeing What Eyes Cannot](https://offnadir-delta.com/blog/false-color-composites-interpretation)
- [Chlorophyll Mapping with Sentinel-2 Red-Edge Bands](https://offnadir-delta.com/blog/chlorophyll-red-edge-sentinel2)
- [SAVI and Soil-Adjusted Vegetation Indices](https://offnadir-delta.com/blog/soil-adjusted-vegetation-index-savi)
- [Land Surface Temperature from Thermal Satellite Sensing](https://offnadir-delta.com/blog/land-surface-temperature-thermal-sensing)
- [SAR Backscatter Coefficient: Understanding Sigma Naught](https://offnadir-delta.com/blog/sar-backscatter-coefficient-guide)
- [SAR Speckle Noise: What It Is and How to Filter It](https://offnadir-delta.com/blog/sar-speckle-noise-filtering)
- [SAR Interferometry (InSAR): Measuring Ground Movement from Space](https://offnadir-delta.com/blog/sar-interferometry-insar-explained)
- [Coherence-Based Change Detection with SAR](https://offnadir-delta.com/blog/coherence-change-detection-sar)
- [Ascending vs. Descending Orbits in SAR](https://offnadir-delta.com/blog/ascending-descending-orbit-sar)
- [SAR for Soil Moisture Estimation](https://offnadir-delta.com/blog/sar-soil-moisture-estimation)
- [Precision Agriculture with Satellite Data](https://offnadir-delta.com/blog/precision-agriculture-satellite-guide)
- [Crop Type Mapping with Satellite Time Series](https://offnadir-delta.com/blog/crop-type-mapping-satellite-imagery)
- [Crop Yield Estimation from Remote Sensing](https://offnadir-delta.com/blog/crop-yield-estimation-remote-sensing)
- [Irrigation Monitoring and Water Use from Space](https://offnadir-delta.com/blog/irrigation-monitoring-from-space)
- [Early Detection of Crop Stress with Satellite Data](https://offnadir-delta.com/blog/crop-stress-early-detection-satellite)
- [Mapping Soil Properties from Satellite Imagery](https://offnadir-delta.com/blog/soil-properties-mapping-satellite)
- [Deforestation Monitoring with Satellite Data](https://offnadir-delta.com/blog/deforestation-monitoring-satellite-data)
- [Glacier Retreat Monitoring with Satellite Time Series](https://offnadir-delta.com/blog/glacier-retreat-satellite-monitoring)
- [Coral Reef Monitoring from Space](https://offnadir-delta.com/blog/coral-reef-monitoring-from-space)
- [Drought Monitoring with Satellite Indices](https://offnadir-delta.com/blog/drought-monitoring-satellite-indices)
- [Mangrove Mapping with Satellite Imagery](https://offnadir-delta.com/blog/mangrove-mapping-satellite-imagery)
- [Ocean Color Remote Sensing: What Satellites See in the Sea](https://offnadir-delta.com/blog/ocean-color-satellite-monitoring)
- [Methane Emission Detection from Satellites](https://offnadir-delta.com/blog/methane-emission-detection-satellites)
- [Air Quality Monitoring: Satellite NO₂ and PM2.5](https://offnadir-delta.com/blog/air-quality-satellite-no2-pm25)
- [Land Cover Change Detection Methods](https://offnadir-delta.com/blog/land-cover-change-detection-methods)
- [Earthquake Damage Assessment with Satellite Data](https://offnadir-delta.com/blog/earthquake-damage-assessment-satellite)
- [Hurricane and Typhoon Tracking from Satellites](https://offnadir-delta.com/blog/hurricane-typhoon-satellite-tracking)
- [Landslide Detection with SAR and Optical Satellites](https://offnadir-delta.com/blog/landslide-detection-satellite-sar-optical)
- [Volcanic Eruption Monitoring from Space](https://offnadir-delta.com/blog/volcanic-eruption-monitoring-satellites)
- [Oil Spill Detection with Satellite SAR](https://offnadir-delta.com/blog/oil-spill-detection-satellite-sar)
- [Post-Disaster Infrastructure Assessment from Space](https://offnadir-delta.com/blog/post-disaster-infrastructure-assessment)
- [Satellite Rapid Damage Mapping Workflow](https://offnadir-delta.com/blog/satellite-rapid-damage-mapping-workflow)
- [Urban Heat Islands from Satellite Thermal Data](https://offnadir-delta.com/blog/urban-heat-island-satellite-thermal)
- [Urban Sprawl Monitoring with Satellite Time Series](https://offnadir-delta.com/blog/urban-sprawl-monitoring-satellite-time-series)
- [Construction Monitoring from Satellite Imagery](https://offnadir-delta.com/blog/construction-monitoring-satellite-imagery)
- [Solar Farm Mapping and Detection from Space](https://offnadir-delta.com/blog/solar-farm-mapping-satellite-detection)
- [Ground Subsidence Monitoring with InSAR](https://offnadir-delta.com/blog/ground-subsidence-insar-monitoring)
- [Population Estimation from Satellite Imagery](https://offnadir-delta.com/blog/population-estimation-satellite-imagery)
- [Reservoir Water Level Monitoring with Satellite Altimetry](https://offnadir-delta.com/blog/reservoir-water-level-satellite-altimetry)
- [Wetland Mapping with SAR and Optical Satellites](https://offnadir-delta.com/blog/wetland-mapping-satellite-sar-optical)
- [Evapotranspiration Estimation from Satellite Thermal Data](https://offnadir-delta.com/blog/evapotranspiration-satellite-estimation)
- [Groundwater Depletion Tracking with GRACE Satellites](https://offnadir-delta.com/blog/groundwater-depletion-grace-satellite)
- [Estimating Forest Biomass from Satellite Data](https://offnadir-delta.com/blog/forest-biomass-estimation-satellite)
- [Mapping Burn Severity After Wildfires with NBR](https://offnadir-delta.com/blog/forest-fire-burn-severity-satellite)
- [Forest Degradation vs. Deforestation: Detection Challenges](https://offnadir-delta.com/blog/forest-degradation-vs-deforestation-satellite)
- [Mapping Tree Canopy Height from Space](https://offnadir-delta.com/blog/tree-canopy-height-satellite-lidar)
- [Forest Type Classification from Satellite Imagery](https://offnadir-delta.com/blog/forest-type-classification-satellite)
- [Modern WebGIS Architecture](https://offnadir-delta.com/blog/webgis-architecture-modern-stack)
- [Google Earth Engine: Power and Limitations](https://offnadir-delta.com/blog/google-earth-engine-satellite-analysis)
- [Open Data Cube for Satellite Time Series](https://offnadir-delta.com/blog/open-data-cube-satellite-time-series)
- [Digital Elevation Models Compared: SRTM, ALOS, Copernicus](https://offnadir-delta.com/blog/digital-elevation-models-dem-comparison)
- [Machine Learning for Satellite Image Classification](https://offnadir-delta.com/blog/machine-learning-satellite-image-classification)
- [STAC Explained: Satellite Data Discovery Standard](https://offnadir-delta.com/blog/stac-spatiotemporal-asset-catalog-guide)
- [Satellite Data in Insurance Risk Assessment](https://offnadir-delta.com/blog/satellite-insurance-risk-assessment)
- [Satellite Monitoring of Mining Operations](https://offnadir-delta.com/blog/satellite-monitoring-mining-operations)
- [Satellite Data for Precision Agriculture](https://offnadir-delta.com/blog/satellite-data-precision-agriculture)
- [Maritime Vessel Detection from Satellite SAR](https://offnadir-delta.com/blog/satellite-maritime-vessel-tracking)
- [Supply Chain Monitoring from Space](https://offnadir-delta.com/blog/satellite-supply-chain-monitoring)
- [Satellite Archaeology and Cultural Heritage](https://offnadir-delta.com/blog/satellite-archaeology-cultural-heritage)
- [Sentinel-2 vs. Landsat 9: A Practical Comparison](https://offnadir-delta.com/blog/sentinel-2-vs-landsat-9-comparison)
- [Satellite Image Compositing and Mosaicking](https://offnadir-delta.com/blog/satellite-image-compositing-mosaicking)
- [How to Monitor Any Area with Satellite Time Series](https://offnadir-delta.com/blog/satellite-area-monitoring-time-series-guide)
- [Vegetation Index Time Series Monitoring with Sentinel-2](https://offnadir-delta.com/blog/vegetation-index-time-series-monitoring)
- [SAR Backscatter Time Series: Detecting Change with Radar](https://offnadir-delta.com/blog/sar-time-series-change-monitoring)
- [Satellite Anomaly Detection in Time Series Data](https://offnadir-delta.com/blog/satellite-anomaly-detection-time-series)
- [Continuous Maritime Monitoring with SAR Ship Detection](https://offnadir-delta.com/blog/continuous-maritime-monitoring-sar-ship-detection)
- [Monitoring Economic Activity with VIIRS Nighttime Light Time Series](https://offnadir-delta.com/blog/viirs-nighttime-lights-time-series-monitoring)
- [Monitoring Water Surface Changes with NDWI Time Series](https://offnadir-delta.com/blog/ndwi-water-surface-change-monitoring)
- [Forest Health Monitoring with NDVI and SAR Vegetation Indices](https://offnadir-delta.com/blog/forest-health-monitoring-ndvi-rfdi)
- [Post-Disaster Recovery Monitoring with Satellite Time Series](https://offnadir-delta.com/blog/post-disaster-recovery-monitoring-satellite)
- [Seasonal Crop Monitoring with NDVI Time Series](https://offnadir-delta.com/blog/crop-season-monitoring-ndvi-time-series)
- [Coastal Change Monitoring with NDWI and SAR Time Series](https://offnadir-delta.com/blog/coastal-change-monitoring-ndwi-sar)
- [Wildfire Recovery Monitoring: From Burn Scar to Regrowth](https://offnadir-delta.com/blog/wildfire-recovery-monitoring-nbr-ndvi)
- [Flood Monitoring with Sentinel-1 SAR Time Series](https://offnadir-delta.com/blog/flood-monitoring-sar-time-series)
- [Multi-Index Satellite Monitoring: Why One Sensor Is Never Enough](https://offnadir-delta.com/blog/multi-index-satellite-monitoring)
- [Environmental Compliance Monitoring with Satellite Imagery](https://offnadir-delta.com/blog/environmental-compliance-monitoring-satellite)
- [How to Choose the Right Satellite Index for Monitoring](https://offnadir-delta.com/blog/how-to-choose-satellite-index-monitoring)
- [Introducing Delta Signals: Geospatial Event Intelligence for Satellite Monitoring](https://offnadir-delta.com/blog/delta-signals-geospatial-event-intelligence)
- [Evidence-Based Event Intelligence: How Delta Signals Stays Source-Linked and Auditable](https://offnadir-delta.com/blog/evidence-based-event-intelligence-source-linked-geolocated)
- [Harmonized Landsat Sentinel (HLS): One Consistent Time Series from Two Sensors](https://offnadir-delta.com/blog/harmonized-landsat-sentinel-hls-guide)
- [The Landsat Program: A Complete Guide to 50+ Years of Earth Observation](https://offnadir-delta.com/blog/landsat-program-complete-guide)
- [Synthetic Aperture Radar (SAR): The Complete Guide](https://offnadir-delta.com/blog/synthetic-aperture-radar-complete-guide)
- [MODIS Satellite Data: The Daily, Decades-Long View of Earth](https://offnadir-delta.com/blog/modis-satellite-data-guide)
- [How Accurate Is Satellite Data? A Practical Guide to Validation and Uncertainty](https://offnadir-delta.com/blog/satellite-data-accuracy-validation-guide)
- [CO₂ and Carbon Monitoring from Satellites: Measuring the Invisible](https://offnadir-delta.com/blog/co2-carbon-monitoring-satellites)
- [Coastal Erosion Monitoring from Satellites: Tracking Shoreline Change](https://offnadir-delta.com/blog/coastal-erosion-shoreline-monitoring)
- [Deep Learning for Earth Observation: From CNNs to Semantic Segmentation](https://offnadir-delta.com/blog/deep-learning-earth-observation-guide)
- [Geometric Correction and Orthorectification of Satellite Imagery](https://offnadir-delta.com/blog/geometric-correction-orthorectification)
- [Hyperspectral Remote Sensing: What 200+ Bands Reveal That Multispectral Can't](https://offnadir-delta.com/blog/hyperspectral-remote-sensing-prisma-enmap)
- [Pansharpening: How to Get High-Resolution Multispectral Imagery](https://offnadir-delta.com/blog/pansharpening-resolution-enhancement)
- [SAR-Optical Data Fusion: Getting More from Two Sensors Than Either Alone](https://offnadir-delta.com/blog/sar-optical-data-fusion-techniques)
- [Satellite Imagery for Agriculture: What Actually Works at Field Scale](https://offnadir-delta.com/blog/satellite-imagery-agriculture-field-monitoring)
- [Spatial vs Temporal Resolution: The Fundamental Trade-Off in Satellite Imaging](https://offnadir-delta.com/blog/spatial-resolution-vs-temporal-resolution)

---
- [NISAR L-Band SAR vs Sentinel-1 C-Band: When Does Wavelength Decide the Answer?](https://offnadir-delta.com/blog/nisar-l-band-sar-vs-sentinel-1)
- [Why Use an Event-Intelligence Platform When You Already Have ChatGPT or Claude?](https://offnadir-delta.com/blog/why-use-event-intelligence-when-you-have-chatgpt-or-claude)

## 10. How It Works, Provenance & Status

- [Methodology](https://offnadir-delta.com/methodology): How signals are collected, AI-enriched, geolocated and scored — including what is automated and what is not reviewed by a human
- [Delta Impact Scale and Delta GEOINT Readiness](https://offnadir-delta.com/methodology/scales): How each event's impact level (0–5, the highest public threshold its reported figures cross — UCDP, EM-DAT, USGS PAGER, GDACS, Copernicus EMS) and imaging class (A–E, from three recorded facts) are worked out. Both are Off-Nadir Delta's own scales, not issued by a public body.
- [Source & Content Policy](https://offnadir-delta.com/source-policy): How news reporting is used — what is collected (public pages; robots.txt rules for all crawlers and machine-readable reservations are followed; rules naming other companies' AI crawlers are not applied), how long article text is kept (deleted 14 days after an event stops receiving reports), what is shown (own summaries and assessments, source links, no article text), the legal position taken, and how publishers and rights holders can ask us to stop
- [Security](https://offnadir-delta.com/security): Data handling, authentication and infrastructure practices
- [Status](https://offnadir-delta.com/status): Current service status and the version the live API/MCP surface reports
- [Changelog](https://offnadir-delta.com/docs/changelog): What changed and when
- [Developer](https://offnadir-delta.com/author/kazushi-motomura): Kazushi Motomura — background and the basis for the technical claims on this site

---

## 11. Legal

- [Terms of Service](https://offnadir-delta.com/terms)
- [Privacy Policy](https://offnadir-delta.com/legal/privacy-policy)
- [Refund Policy](https://offnadir-delta.com/legal/refund-policy)
- [Commercial Transactions](https://offnadir-delta.com/legal/commercial-transactions)
- [Open Source Licenses](https://offnadir-delta.com/legal/oss-licenses)

---

## Developer (E-E-A-T)

**Created by:** Kazushi Motomura (Off-Nadir Lab)
**Note:** Personal independent project, not affiliated with any company.

**Credentials:**
- Ph.D. in Informatics (Yokohama National University, 2026)
- Master's in Earth System Science and Technology (Kyushu University); research in satellite oceanography
- 10+ years in satellite data processing
- Co-author, "Remote Sensing Encyclopedia" (Remote Sensing Society of Japan)

**Links:** [Website](https://offnadir-delta.com) | [GitHub](https://github.com/kazushi-fa) | [LinkedIn](https://www.linkedin.com/in/kazushi-motomura-bb168b28/)

---

## Citation

"Off-Nadir Delta - AI-Ready OSINT & Satellite GEOINT Platform by Off-Nadir Lab (https://offnadir-delta.com)"

Last Updated: 2026-10-19