Hi all, I'm trying to estimate albedo from landsat5 images but I'm getting very strange result. Water bodies, for instance, are giving me an albedo of 0.15 to 0.17, unusualy high. Here is the procedure I'm doing
1) Convert TM images from grey level to radiance using the Lmax / Lmin formula (parameters used given bellow [1]) 2) Apply 6S atmospheric correction, using standard tropical atmosphere, continental aerosol mode 3) Calculate shorwave albedo using Liang (2000) formula (based on bands 1; 3; 4; 5 and 7) Since the albedo of water areas is comming out too high, I'm guessing I messed up the i.atcorr procedure. I don't quite understand what should be the input image (DN or Radiances?) and what is the output image (reflectance scaled to 255?) Thanks Daniel [1] Band LMIN LMAX 1 -1,52 193 2 -2,84 365 3 -1,17 264 4 -1,51 221 5 -0,37 30,2 7 -0,15 16,5 _______________________________________________ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user
