If it's a small number of rasters then you can use the GRASS provider and 'r.mapcalc'. But if you want to compare more than one raster with a base raster, then you will need to call 'r.mapcalc' multiple times to get a cumulative result.
The 'if()' expression(*) will be your friend. Sth. like this: if(ValRas==InRas1,OutRas=OutRas+1,OutRas) (raster names match illustration on ArcGIS help page: http://pro.arcgis.com/en/pro-app/tool-reference/spatial-analyst/equal-to-frequency.htm) For a larger number of 'InRasN' rasters, you would need to add some logical 'ands' (&&), and run computations _iteratively_: if(ValRas==InRas1,OutRas=OutRas+1,OutRas) if((ValRas==InRas1)&&(ValRas==InRas2),OutRas=OutRas+1,OutRas) ... The tricky part is that 'OutRas' cannot be the output raster of the GRASS module. It has to be a pre-existing raster that must be initialized to have '0' in all cells. You pass that same raster to 'r.mapcalc' at every iterative run and at the end you have the cumulative result in 'OutRas'. Best, Ben -- *https://grass.osgeo.org/grass75/manuals/r.mapcalc.html On 15/05/18 13:48, geoff carver wrote: > Anyone know how to do the ArcGIS “equal to frequency” function in QGIS??? > > > > _______________________________________________ > Qgis-user mailing list > [email protected] > List info: https://lists.osgeo.org/mailman/listinfo/qgis-user > Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-user > -- Dr. Benjamin Ducke Deutsches Archäologisches Institut (DAI) Zentrale Berlin, IT-Referat * Projekt "Stunde Null" * _______________________________________________ Qgis-user mailing list [email protected] List info: https://lists.osgeo.org/mailman/listinfo/qgis-user Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-user
