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  1. pranjal004
    Hey everyone, While calculation emissivity from NDVI index using Sobrino's method, it is clear what we have to do when NDVI is greater than 0.2. But when NDVI is less than 0.2, we are given an equation a + b®. where a and b are regression coefficients and R is the reflectivity. R can be calculated easily. How do we estimate or select the values of a and b? My project area also has water body which has a negative NDVI value. Please help!
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