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Fractional Cover From NDVI

Question asked by resat10 on Nov 2, 2017


I tried to calculate fractional vegetation cover from NDVI. I have calculated NDVI but I don't know how can I extract NDVI soil and NDVI veg. values to use in the formula below by using my NDVI map. 

 Fc=(NDVI—NDVI soil)/(NDVI veg—NDVI soil)

Thank you for your helps