Free NDVI Crop Health Map — Monitor Your Farm with Sentinel-2 Satellite Imagery

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Tap Draw field to mark your land. NDVI loads automatically.
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How it works

  1. 1. Draw your fieldMark your land's boundary on the map — takes about a minute, no signup needed.
  2. 2. See crop healthThe latest cloud-free Sentinel-2 satellite image loads automatically as an NDVI color map: green is healthy, red is stressed.
  3. 3. Act where it mattersWalk straight to the weak zones, track changes across dates, and export the map image to share.

Frequently asked questions

What is NDVI?

NDVI (Normalized Difference Vegetation Index) measures how much healthy green vegetation is present in each 10×10 meter square of your field, computed from Sentinel-2 satellite imagery as (NIR − Red) / (NIR + Red). Values near 0.8 indicate a dense healthy canopy; values below 0.2 indicate bare soil or severe stress. Read the full NDVI guide →

Is ndvi.us really free?

Yes. The imagery comes from the European Space Agency's Sentinel-2 satellites, which are free and open under the EU Copernicus programme. There is no signup, subscription, or field limit.

How often is the satellite imagery updated?

Sentinel-2 passes over most farms every 3–5 days. Cloudy passes are automatically skipped, so the map always shows the most recent usable image, which can occasionally be one to three weeks old during cloudy seasons. More on revisit times →

What field size does it work for?

Best results come from fields of half an acre or larger. Each pixel covers 10×10 meters, so very small plots will look blocky but the field average remains meaningful.

Want to get more from satellite monitoring? Visit the crop monitoring blog.