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QGIS: Calculate NDVI for the Drone Geotiff File

Sometimes you need to calculate the average NDVI for some polygon inside the field. You can do the following in a QGIS program.

- Visualize Initial Drone NDVI geotiff

- Create a new layer

- Setup layer name and geometry type, and press OK

- Select the layer in the Layers panel
Select “Toggle Editing” (1)
Select “Add Polygon Feature” (2)

- Draw a polygon. To finish drawing press the right mouse button and set “id” in the popup.
Finish the layer by pressing “Toggle Editing” again and press “Save”.

- Select Zonal statistics in the “Processing toolbox” panel.

- Select raster layer (1),
Select polygon layer (2),
Press “Run” (3).
- Select the layer in the Layers panel and press the right mouse button, in the context menu select Open Attribute Table.

- Calculated statistics will be shown in the table.