I want to compare 2 same tiles at different dates.
I use the raster calculator like this :
(IR_band_frb - IR_band-aug)^2
The data range goes from -6049 to 4486 ... Why I get negativ results ?
(Same when I write "abs" instead of "^2" symbol)
But I get missing values (transparent "colors" in the output raster). So negatives values are passed to the square root operation.
Maybe do you have a better way for comparing 2 rasters in QGIS, do not hesitate !