Hello Marion, On Mon, Jul 2, 2018 at 12:18 PM, marion-brunet <[email protected]> wrote: > Hello, > > I am trying to calculate the difference between two raster layers. For that, > I am using GRASS in QGIS. I use the command r.mapcalc. In the field > "expression to evaluate" I wrote > r.mapcalc expression=diff =TIN_12_17-TIN_06_18
be sure to have white spaces around the - (minus) TIN_12_17-TIN_06_18 --> TIN_12_17 - TIN_06_18 and, as Vero wrote, perhaps quotes. So, pls try: r.mapcalc expression="diff =TIN_12_17 - TIN_06_18" Best, Markus _______________________________________________ grass-user mailing list [email protected] https://lists.osgeo.org/mailman/listinfo/grass-user
