Off-Nadir Delta
Browser-Based Satellite Imagery Analysis WebGIS
Unlock the Power of Satellite Data
Fast, simple, and powerful satellite imagery analysis.
Access global data in seconds, analyze with a few clicks.
Lightning Fast
Instant satellite data access. No waiting, no complex setup. Start analyzing in seconds.
Easy to Use
Search, visualize, analyze—all with just a few clicks. No training required.
Clean Interface
Minimal design, maximum power. Focus on your data without distraction.
Satellite Data at Your Fingertips
Access multiple satellite data sources directly in your browser
Sentinel-2 Optical
10-meter resolution multispectral imagery. Ideal for vegetation analysis and land cover mapping.
Learn moreSentinel-1 C-Band SAR
C-band radar for surface features. Works through clouds, day or night. Perfect for flood detection.
Learn moreNISAR L-Band SAR
L-band radar penetrates forest canopy. Ideal for biomass estimation and vegetation monitoring.
Learn moreVIIRS Nighttime Lights
NASA Black Marble data showing Earth at night. Track urban development and power outages.
Learn moreActive Fire Monitoring
Near real-time fire hotspots from NASA FIRMS. VIIRS 375m resolution, updated daily. No API key needed.
Learn moreYour Own Data
Upload GeoTIFF, COG, or GeoJSON files. Combine with satellite imagery for custom analysis.
Learn moreLearn & Analyze
Step-by-step guides to help you get the most from satellite data
NDVI Vegetation Analysis
AgricultureCalculate vegetation health indices using Sentinel-2 imagery
Read guideChange Detection
AnalysisCompare satellite images before and after any event
Read guideSAR Flood Mapping
DisasterLearn to detect and map floods using radar imagery
Read guideSAR Ship Detection
MaritimeIdentify vessels in SAR imagery for maritime monitoring
Read guideLatest Articles
Tutorials and insights on satellite imagery analysis
Active Fire Monitoring with NASA FIRMS: Real-Time Hotspot Detection from Space
NASA FIRMS provides near real-time fire hotspot data from VIIRS and MODIS satellites. Learn how active fire monitoring works, what the data shows, and how to use it in Off-Nadir Delta for wildfire tracking and disaster response.
SAR vs Optical Satellite Imagery: A Practical Guide to Choosing the Right Sensor
SAR and optical satellites measure fundamentally different things. This guide explains the physics, strengths, and limitations of each — and when to combine them for better results.
Estimating Soil Moisture with SAR: Why Radar Sees What Optical Can't
How SAR backscatter responds to soil moisture content, the physical basis for radar-based soil moisture estimation, and practical challenges including vegetation cover and surface roughness effects.
Everything You Need
Simple tools. Fast results. Easy analysis.
Instant Map View
Clean, fast-loading map interface. Drag-and-drop layers. Switch views in one click. No clutter, just your data.
Quick Search
Find satellite data in seconds. Simple filters. Instant results. Access years of imagery without the wait.
One-Click Visualization
Apply different color schemes instantly. True Color, False Color, indices—all ready to use. No complex configuration.
Easy Comparison
Compare images side-by-side with simple controls. Track changes over time. Detect patterns effortlessly.
Save & Resume
Save your work instantly. Resume anytime. Share with one link. No complicated file management.
Real-Time Fire Monitoring
NASA FIRMS active fire data updated daily. Overlay fire hotspots on satellite imagery to assess wildfire impact and response.
Protected & Trusted
Your account is designed to stay secure. Built-in protection against common attacks, plus extra security when you need it. Just sign in and start.
Browser-Based, No Setup
No software to install. Access satellite imagery and analysis tools from any browser, anywhere. Start working in seconds.
Import & Overlay
Upload your own GeoTIFF, COG, or GeoJSON files. Combine with satellite data on a single map for custom analysis.
Frequently Asked Questions
Quick answers to common questions about satellite imagery and our WebGIS.
Off-Nadir Delta is a browser-based WebGIS platform for satellite imagery analysis. Access Sentinel-1 SAR, Sentinel-2 Optical, NISAR L-Band SAR, VIIRS Nighttime Lights, and NASA FIRMS Active Fire data directly in your browser without any GIS software installation.
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Join professionals and researchers using Off-Nadir Delta for satellite imagery analysis. Get started for free today.