Re: [Qgis-user] nodata and raster calc

[Micha Silver]

On 11/02/2019 10:42, Tim Sutton wrote: Hi On 11 Feb 2019, at 10:38, Havard Tveite <havard.tve...@nmbu.no> wrote: nodata + 1 = nodata nodata * 1 = nodata nodata AND 1 = nodata nodata OR 1 = 1 It might be worth noting that in the GRASS mapcalc module, there's a special operator for these situations. From the manpage: NULL-values in any arithmetic or logical operation should result in NULL. (however, &&& and ||| are treated specially, as described below). The &&& and ||| operators observe the following axioms even when x is NULL: x &&& false == false false &&& x == false x ||| true == true true ||| x == true Hmm yes, the OR case should return one! Regards Tim   --- Tim Sutton t...@qgis.org _______________________________________________ Qgis-user mailing list Qgis-user@lists.osgeo.org List info: https://lists.osgeo.org/mailman/listinfo/qgis-user Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-user -- Micha Silver Ben Gurion Univ. Sde Boker, Remote Sensing Lab +972-523-665918

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