Dear all I have some strange behaviour in r.mapcalc that i can not figure out the reason. I have a Float32 raster with very large pixels values wget https://www.dropbox.com/s/pxh473rs34wvxuc/basin_lbasin_172_oft_crop.tif?dl=0 min max 241981407232 3266766176256 I want rescale to in such a way that the min is reachin 1 and the maximum value is - min Therfore min=241981407231.0 r.mapcalc " output = float( float(input) - $min ) " and i get
min max output 1 3024784719872 which rather should be 3266766176256 - 241981407231 = 3024784769025 It seems to me that the subtraction is working fine for small numbers but not for larger numbers. I tried all the combinations of r.mapcalc " output = float( float(input) - $min ) " r.mapcalc " output = float( input - $min ) " Attached the script. Did I reach some numerical limitation? Any suggestions? Thanks giuseppe -- Giuseppe Amatulli, Ph.D. Research scientist at School of the Environment Yale University New Haven, CT, USA - 06511 Tweeter: @BigDataEcology Teaching: http://spatial-ecology.net Work: https://environment.yale.edu/profile/giuseppe-amatulli/
sc39_lbasin_basin_uniq_CompUnit_test.sh
Description: application/shellscript
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