[Qgis-user] reclass raster nodata=0

[Havard Tveite]

You could use the GRASS function r.null (available in
Processing).

Håvard

On 30. des. 2016 11:35, Raymond Nijssen wrote:
> I'd like to reclass a raster that contains just cells with values nodata
> and 1. (I created it by rasterizing a polygon layer.)
>
> Now I want to change all nodata values to 0, but I cannot find any way
> to do this. I tried the grass and gdal tools and the qgis raster
> calculator, but without luck.
>
> Does anyone know?
>
> Thanks!
> Raymond
>
>
> PS
>
> In fact I have 2 of these layers and I want to "union" them. So I tried:
>
> raster1 OR raster2
>
> in the calculator, but that only returns 1 for the cells that contain a
> 1 in both input rasters, resulting in the overlapping area.
>
> By changing nodata to 0, I'm hoping to calculate:
>
> (raster1 + raster2) ^ 0
>
> and get my desired results.
>
> Any ideas on this?
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-- 
Håvard Tveite
Department of Mathematical Sciences and Technology, NMBU
Drøbakveien 31, POBox 5003, N-1432 Ås, NORWAY
Phone: +47 67231548 Fax: +47 64965401 http://www.nmbu.no/imt/