I tried to convert DN values of a pansharpened 2010 GeoEye-1 image into radiance then reflectance in QGIS using raster calculator with the following formulas: (1) L= gain* DN + bias; (2)p = pi* L* d2/ ESUN* cos0s.
Problem is I came up with negative value ranges for all my bands. May I know what could have possibly went wrong with my computations? I used the same formulas for my Quickbird image and I did not encounter any related problem.
Thank you.
أكثر...
Problem is I came up with negative value ranges for all my bands. May I know what could have possibly went wrong with my computations? I used the same formulas for my Quickbird image and I did not encounter any related problem.
Thank you.
أكثر...