Hola! I am using GRASS inside QGIS and I need to perform some very basic arithmetic on raster map layers using "r.mapcalc". Once I have created my mapset in GRASS and imported all three rasters into GRASS from QGIS view, I define my algorithm by simply doing "Raster_A + Raster_B + Raster_C". However, the output gives the message "Unable to open raster map. Finished with error".
I am not sure what the problema is, but I suspect that it may be related to the extent of each layer, which is different for each raster: Raster_A Layer Extent (layer original source projection): -264465.6428050000104122,3892490.3601970002055168: 1442088.1851800000295043,7588100.0655570002272725 Raster_B Layer Extent (layer original source projection): -231150.3030560000042897,3942814.9593090000562370: 1421853.4221910000778735,7568606.9837530003860593 Raster_C Layer Extent (layer original source projection): -302992.6578800000133924,3856086.4785620002076030: 1162350.0904449999798089,7559207.0393540002405643 Q1: What do these long numbers represent? Q2: Should every raster layer have the exact same layer extent for the mathematical calculation to come out right? Thank you so much in advance! Luciano _______________________________________________ Qgis-user mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/qgis-user
