🤔 What is the NDVI index?
NDVI (Normalized difference vegetation index) is an indicator of plant health. It shows how a plant reflects red and near-infrared light waves.
A healthy plant with a lot of chlorophyll and good cell structure actively absorbs red light and reflects near-infrared light.
The index ranges from -1 to 1. NDVI values between -1 to 0 correspond to surfaces like snow, water, sand, stones, and infrastructure objects, such as roads and houses. NDVI values for plants range from 0 to 1.
Our blog has more insights into what the NDVI index can tell you at different stages of the season.
🔍 How to check the vegetation quality in the web app
Go to the 'Fields' section of the main menu and select a field from your field list or click it on the map. Please note that in the web app, you can only see the NDVI vegetation index for fields that have been added and saved to your account.
Click the field right on the map or click its name in the field list. You'll see its NDVI map. It may take a few seconds to calculate the index.
A bar with the dates of the available images will appear at the top of the screen. Scroll through them to see how the NDVI index has changed over time.
🛰 How to check NDVI for past dates
After you select a field, you'll see a bar with the dates of the available images at the top of the screen. Just scroll through the dates.
Use the Slider or Grid View tool to compare NDVI for different days on the same field. Select a field, and click the split window (Slider) icon on the right side of the screen.
Use the vegetation index chart in the 'Weather' tab to see how NDVI values changed during the season.