How can I calculate mean NDVI value for each field?
Why it can be needed?
Having datasets for each crops growing stage and Mean NDVI value for each, you can create graphs for monitoring crop growth dynamic.
To do that you need to have two inputs:
1) NDVI image. Go to the Raster tab and from Classification group choose Unsupervised – NDVI to create it if you don’t have.
2) Vector file with fields borders.
This process can be optimized using Spatial Modeler. The model should look as following (in attachment as well):