Vegetation Analysis

Free NDVI Calculator Online

With Off-Nadir Delta, you can calculate NDVI vegetation indices directly in your browser. Monitor crop health, forest conditions, and biomass using Sentinel-2 imagery — no software required.

TL;DR: NDVI = (NIR - Red) / (NIR + Red). Values -1 to +1; healthy vegetation 0.3-0.8. Calculated from Sentinel-2 B8 (842nm) and B4 (665nm) at 10m resolution. Free in Off-Nadir Delta. 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

Select Your Area

Navigate to your field, forest, or area of interest.

Search Sentinel-2 Data

Find cloud-free imagery for your desired time period.

Apply NDVI Visualization

View NDVI with color scale from bare soil to dense vegetation.

Compare Over Time

Add multiple dates to track seasonal changes or crop growth.

Frequently Asked Questions

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?▼

NDVI calculated from Sentinel-2 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.

Start Calculating NDVI

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

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