[Qgis-user] Nodata pixels in the raster calculator

[David Strip]

It appears to me that the raster calculator treats a nodata pixel the same as any other pixel, performing the requested operation on the nodata pixel as if it were a valid value. In addition, it appears that there is no way to create an output raster that has a nodata value.*  Are these two statements correct?

I know that I can write a formula
        (raster@1 = <nodata>) * <nodata> + (raster@1 != <nodata>) * <whatever you want for valid pixels>

but this requires you know the nodata value. Even in this case, the resulting raster does not encode that value as nodata.







*The GDAL processing algorithm "Raster Calculator" does allow specifying a nodata value

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