On Wed, Sep 7, 2022 at 11:43 AM Michael Dufty via Qgis-user <[email protected]> wrote: > > It appears that there are two different native raster calculator tools in QGIS > > One is found in at the top of the raster menu > > The other is in the processing toolbox in the raster analysis group >
Yeah, we know it's a mess. Both are based on the same QGIS core implementations, they just use a different GUI but they must give the same results. > > > (Not to mention the GDAL raster calculator and SAGA raster calculator) > This one is based on GDAL instead and it may give different results. > > > Can anyone explain the reason for there being two, and what the differences > are? > > I’ve been very confused by it, mainly because the one in the raster menu does > not appear to handle negative values correctly. I’d been wondering why NDVI > type expressions with negatives randomly worked or not, and discovered it > just depended on which raster calculator I used. > > Is it expected that the one in the raster menu doesn’t handle negative values > correctly? It looks like it might do calculations based on unsigned integers > regardless of the input and output raster formats. > You could file a bug report attaching a small dataset to reproduce the issue and if you are using OpenCL acceleration (see global QGIS settings). Kind regards. -- Alessandro Pasotti QCooperative: www.qcooperative.net ItOpen: www.itopen.it _______________________________________________ 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
