I have shapefiles for more than 1000 farms.
I want to use Hydrological model to model the water balance in these farms. Each farm is devided in to seperate parts .
My problem is that the whole area of these farms is not under cultivation and in each season farmers decide based on available water and their budget to put how much of their land under cultivation
In other words, I do not know what the percentage of farms is being used by each farmer.
I have estimated NDVI from landsat8. These NDVI values can help me to find the area of each farm which is being used by farmer.
How can i find the area of my shapefiles which have specific NDVI? For example, if I have shapefile for 200 Hac farm , what area of this shapefile has NDVI between 0.1 and 1?