🤔 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 absorbs a lot of 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 (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.
🍎 Contrasted NDVI
The 'Contrasted NDVI' layer in the mobile and web apps shows differences in the field's NDVI values more clearly with bright, contrasting colors. You can spot problem areas on your smartphone screen, even on a bright sunny day out in the field. NDVI is typically shown on a scale of 0 to 1. But the color scale for contrasted NDVI ranges from the minimum to maximum NDVI values in this particular field.
🔍 How to check vegetation quality in the web app
NDVI data is available in the field card on the 'Status' tab.
How to view the current NDVI index on a map
Go to the 'Fields' section of the main menu.
Click the drop-down list in the upper-left corner of the map, select NDVI in the Map Layer column, and Average NDVI in the Label column, if needed.
You may also find it useful to select sort order by NDVI value in the field list settings.
How to view the index for a specific date
Go to the 'Fields' section of the main menu and select a field from your field list or click it on the map.
On the 'Status' tab, expand the field preview and select the NDVI or Contrasted NDVI layer. It may take a few seconds to calculate the index.
A calendar bar with the dates of the available images will appear at the top of the screen. Switch between dates to see how the index has changed over time.
Click the split window icon on the right side of the screen to compare NDVI for different days or with other data layers.
How to view the NDVI chart
Go to the 'Fields' section of the main menu and select a field from your field list or click it on the map.
Use the NDVI chart in the Status tab to see how NDVI values changed during the season. Select your own time frame to plot the graph if necessary.
When hovering the mouse over the chart line, the app will show the median value of the index on that date.
📱 How to monitor NDVI in the mobile app
Go to the 'Fields' tab.
Select NDVI or Contrasted NDVI as a map layer to see your entire farm's NDVI imagery.
Click a specific field to check its NDVI for different dates.
You can also turn on notifications in the OneSoil Scouting mobile app to learn about NDVI updates! In the mobile app, open the 'Profile' tab and select 'Settings'. Activate the notifications by clicking the tumbler in the 'Notifications' section.
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