Quick Answer: Off-Nadir Delta is a geographic risk intelligence 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 you can use for first response and situational awareness. It has four product surfaces: the Watchfloor (today's prioritized picture of global risk — where to look now), Delta Agent (an AI analyst that explains what happened and why it matters, and recommends which satellite sensor and area to image next), the Map (verify events from space with Sentinel-1 SAR, Sentinel-2 optical, VIIRS nighttime lights, and NASA FIRMS active fires — no GIS software required), and Daily Reports (a written daily assessment with Key Judgments, calibrated confidence, and an outlook). Built for OSINT, geopolitical-risk, and satellite-intelligence analysts, and for developers integrating signals and briefs via API and MCP — with emergency management, media, enterprises, and researchers using it too. No intelligence background required. Free tier available. Teams use it for geopolitical & supply-chain risk intelligence, defense and maritime domain awareness, disaster response, environmental and crop monitoring, urban planning, nighttime-lights analysis, research and education, and programmatic access for developers and AI agents (REST API + MCP).
Use Cases
How emergency managers, government teams, journalists, enterprises, researchers, and independent analysts use Off-Nadir Delta's four surfaces — the Watchfloor, Delta Agent, the Map, and Daily Reports — to turn scattered signals into prioritized geographic risk intelligence they can act on.
Geopolitical & Supply-Chain Risk
How do risk teams track world events with satellites?
By pairing a live event feed with satellite follow-up. The Watchfloor plots geolocated security and geopolitical events, distilled from global news media, on a daily world dashboard; Delta Agent turns any question into a sourced, geolocated brief; and the Daily Report delivers Key Judgments with calibrated confidence — so a headline becomes a checkable location you can collect fresh imagery over.
How Off-Nadir Delta helps
- Scan the Watchfloor — no login required — to see where events cluster today.
- Ask Delta Agent for a cited brief on a port, corridor, or facility you depend on.
- Read the Daily Report: Key Judgments, an outlook, and collection priorities.
- Cue continuous monitoring on the exact locations that matter — a tip-and-cue workflow from news to imagery collection.
Defense & Maritime Domain Awareness
How does maritime domain awareness work from space?
Sentinel-1 radar images the ocean day and night, through cloud — so ports, chokepoints, and anchorages can be watched on every pass. Off-Nadir Delta runs SAR ship detection on any scene to reveal vessels, including ones that are not broadcasting AIS, and continuous monitoring flags unusual activity in an area of interest.
How Off-Nadir Delta helps
- Detect ships in Sentinel-1 SAR scenes over any port, strait, or anchorage with ship monitoring.
- Watch harbors and chokepoints continuously with automated area monitoring.
- Fuse event signals with imagery for maritime & security situational awareness.
Disaster Response & Assessment
How is satellite imagery used in disaster response?
Radar first, optical second. Sentinel-1 SAR sees through cloud and smoke, so flood extent can be mapped while the storm is still overhead; NASA FIRMS detects active fires at 375 m resolution, updated several times a day; and before/after difference analysis turns two acquisitions into a damage map for responders and insurers.
How Off-Nadir Delta helps
- Track wildfires on the live fire map — runs on this site, no login needed.
- Map flood extent under cloud cover with Sentinel-1 SAR.
- Run pixel-level change detection between pre- and post-event imagery.
Environmental Monitoring
How do you monitor environmental change with free satellite data?
Sentinel-2 has imaged the world's land surface at 10 m resolution roughly every five days since 2015 — free and open. That archive makes deforestation, coastal change, and water stress measurable: compute vegetation and water indices such as NDVI and NDWI, compare any two dates with difference analysis, and set up continuous monitoring that alerts you when an area departs from its normal pattern.
How Off-Nadir Delta helps
- Browse global NDVI right now on the free NDVI map — no login needed.
- Quantify change between any two dates with difference analysis.
- Get automatic anomaly alerts from continuous area monitoring.
Agriculture & Crop Monitoring
How does satellite crop monitoring work?
Sentinel-2's 10 m resolution resolves individual fields, and its roughly 5-day revisit builds a season-long time series. Vegetation indices like NDVI make crop vigor measurable from space, so stress, irrigation problems, and slow emergence show up before they are obvious on the ground — without driving to every field.
How Off-Nadir Delta helps
- Explore global NDVI for any region — daily VIIRS and a MODIS archive back to 2000 — on the free NDVI map.
- Track a farm's growing season with monitored areas and alerts.
- Learn the index math (NDVI, NDWI, NDMI) in the glossary.
Urban Planning & Development
How is urban growth monitored from space?
By comparing acquisitions across years. Multi-date Sentinel-2 imagery documents expansion, new construction, and green-space loss objectively; difference analysis highlights exactly which pixels changed; and VIIRS nighttime lights add an activity dimension — where electrification and economic activity are growing after dark.
How Off-Nadir Delta helps
- Compare multi-year imagery and export objective evidence for planning decisions.
- Map exactly what changed with pixel-level change detection.
- Watch nighttime lights as a proxy for activity and electrification.
Nighttime Lights Analysis
What can nighttime lights data reveal?
NASA's Black Marble product turns VIIRS Day-Night Band observations into a daily, cloud-corrected picture of the Earth at night. Lighting is a strong proxy for human activity: analysts use it to spot power outages after storms or strikes, track electrification, and watch economic activity where ground data is scarce.
How Off-Nadir Delta helps
- Browse daily VIIRS nighttime lights on the nighttime lights map.
- Compare pre- and post-event lighting with difference analysis to assess outages.
Research & Education
Can students and researchers use satellite data without GIS software?
Yes — everything runs in the browser, with a free tier and nothing to install. Search and visualize Sentinel-1, Sentinel-2, and VIIRS scenes; open your own GeoTIFFs in a client-side viewer that never uploads your file; and lean on the guide and glossary to learn remote-sensing concepts as you go.
How Off-Nadir Delta helps
- Start with the step-by-step getting-started guide.
- View your own GeoTIFF in the browser — files never leave your machine.
- Look up remote-sensing and intelligence terms in the glossary.
Developers & AI Agents
Can software and AI agents use Off-Nadir Delta programmatically?
Yes. The Event Intelligence API exposes event signals, the daily brief, and analyst endpoints over REST with OpenAPI documentation, and the MCP server gives AI agents the same capabilities as tools — so an agent can ask what is happening in the world, request an assessment, and cite the sources.
How Off-Nadir Delta helps
- Pull signals and the daily brief over the Event Intelligence API.
- Connect an AI agent via the MCP server.
- Read the API documentation and OpenAPI spec.
Frequently Asked Questions
Which parts of Off-Nadir Delta are free to use without an account?▼
Does satellite monitoring work at night or under cloud?▼
Can I monitor an area continuously and get alerted?▼
Do I need GIS experience to use these tools?▼
Can my scripts or AI agents access the intelligence?▼
Related Resources
Geopolitical & Event Intelligence
Track world events and confirm them from space
Learn moreAI Satellite Analysis
What AI can (and cannot) do with satellite imagery
Learn moreGeospatial Intelligence (GEOINT)
GEOINT, OSINT, and remote sensing explained
Learn moreOSINT Satellite Intelligence
Satellite imagery in open-source investigations
Learn moreDaily Intelligence Report
A written daily assessment to analytic standards
Learn moreBest OSINT Satellite Tools
An honest ranking of the tools in this space
Learn moreSatellite Data Sources
Sentinel-1/2, VIIRS, FIRMS, and more
Learn moreGetting Started Guide
Watchfloor, Agent, and Map walkthroughs
Learn morePricing
Free tier and token-based plans
Learn moreSee today's picture first
Open the Watchfloor — no login needed — to see where events cluster right now, or create a free account to analyze imagery on the Map.
From headline to satellite evidence
One connected intelligence workflow across four surfaces — free to start, no GIS software or remote-sensing background required.