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QGIS SQL (Virtual layer) How to change values where two geometries are equal, otherwise keep value?

b.DTV will be NULL when there are no duplicate geometries so a.DTV+NULL=NULL. With coalesce you can replace NULL with 0, whenever b.DTV is NULL: select a.DTV + coalesce(b.DTV, 0) as DTV, a....
Bera's user avatar
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2 votes

Soften/round edges of raster layer using QGIS

You can use the QGIS Processing GDAL -> Raster extraction -> Contour polygons tool
user2856's user avatar
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