Off-Nadir Delta
Vegetation Analysis

Free NDVI Calculator Online

Browse global vegetation health below — live, free, no login. Then calculate field-level 10m NDVI from Sentinel-2 for your own area of interest.

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This map is 250-500m global data. Your fields deserve 10m Sentinel-2 NDVI.

Calculate 10m NDVI (free account)Learn area monitoring

TL;DR: NDVI = (NIR - Red) / (NIR + Red). Values -1 to +1; healthy vegetation 0.3-0.8. The map above shows global NDVI from NASA VIIRS (8-day, 500m) and MODIS (16-day archive since 2000, 250m) — free, no login. For field-level detail, Off-Nadir Delta calculates NDVI from Sentinel-2 B8 (842nm) and B4 (665nm) at 10m resolution. Used for crop health, deforestation, drought monitoring.

Understanding NDVI Values

-0.2 Bare/Water0.2 Sparse0.4 Moderate0.6 Healthy0.8+ Dense

How NDVI Works

NDVI = (NIR - Red) / (NIR + Red)

Why It Works

Healthy vegetation absorbs red light for photosynthesis and strongly reflects near-infrared (NIR) light. Stressed or sparse vegetation reflects more red and less NIR, resulting in lower NDVI values.

Sentinel-2 Bands Used

  • • B8 (NIR): 842 nm, 10m resolution
  • • B4 (Red): 665 nm, 10m resolution
  • • Result: 10-meter NDVI map

Growth Tracking

Monitor crop development and vegetation growth throughout the season.

Stress Detection

Identify water stress, nutrient deficiencies, and pest damage early.

Time Series

Compare NDVI values across seasons to understand vegetation patterns.

Applications

Precision Agriculture

Variable rate application, yield prediction, irrigation management

Forest Monitoring

Deforestation detection, fire damage assessment, regrowth tracking

Research & Academia

Ecological studies, climate impact research, biodiversity monitoring

Insurance & Finance

Crop insurance verification, agricultural lending due diligence

How It Works

1

Browse Global NDVI Above

Pick a dataset and date on the live map — VIIRS 8-day for the latest, MODIS 16-day archive back to 2000.

2

Zoom Into Your Region

Spot drought stress, seasonal green-up, or deforestation patterns at continental to regional scale.

3

Go Field-Level with Sentinel-2

In the free workspace, search cloud-free Sentinel-2 imagery and apply 10m NDVI to your exact fields.

4

Compare Over Time

Add multiple dates to track seasonal changes, crop growth, or drought impacts.

Frequently Asked Questions

What NDVI data does the map on this page show?▼
The on-page map streams NASA GIBS composites: VIIRS 8-day rolling NDVI at 500m (updated daily, roughly the last 9 months) and the MODIS Terra 16-day NDVI archive at 250m going back to 2000. It is free and requires no login.
What is NDVI?▼
NDVI (Normalized Difference Vegetation Index) is a ratio of near-infrared and red light reflectance. It ranges from -1 to +1, where higher values indicate healthier, denser vegetation.
How do I interpret NDVI values?▼
Values below 0.1 typically indicate water, snow, or bare ground. 0.2-0.4 suggests sparse vegetation. 0.5-0.7 indicates moderate vegetation. Above 0.7 represents dense, healthy vegetation.
What resolution is the NDVI data?▼
The global browse map on this page is 250-500m (MODIS/VIIRS). NDVI calculated from Sentinel-2 in the workspace has 10-meter resolution, allowing you to see individual field variations.
Can I track NDVI over time?▼
Yes! Our time series feature lets you compare NDVI across different dates to monitor crop growth, seasonal changes, or drought impacts.
Is this useful for precision agriculture?▼
Absolutely. NDVI helps identify areas of stress, irrigation problems, pest damage, or nutrient deficiencies before they become visible to the naked eye.

Related Resources

Sentinel-2 Viewer

Full 13-band imagery

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Change Detection

Track vegetation changes over time

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Sentinel-1 SAR

Radar for any weather

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Glossary

NDVI, EVI, NDWI definitions

Learn more

Pricing

Free tier available

Learn more

Understanding NDVI

What NDVI measures and its limits

Learn more

EVI vs NDVI

When to use each vegetation index

Learn more

Start Calculating NDVI

Analyze vegetation health with a free account. No GIS expertise required.

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From headline to satellite evidence

One connected intelligence workflow across four surfaces — free to start, no GIS software or remote-sensing background required.

Step 1

Pick an event on the Watchfloor

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Step 2

Ask Delta Agent why it matters

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Step 3

Look closer on the Map

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Step 4

Reuse the insight

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