[Qgis-user] Error in clipping a raster

[Nicolas Cadieux]

Hi,

A raster can only be square or a rectangle. Try with a square or rectangle region.  You can use your current polygone but create a new one using the file extent.  After, you can use the original polygone to create a mask.  Raster math will then take care of "stamping out" the irregular region you do not want with nul values.

Nicolas

> Le 23 mars 2017 à 08:46, Giacomo Fontanelli-2 [via OSGeo.org] <ml-node+s1560n5313854h35 at n6.nabble.com> a écrit :
> 
> Hello forum
> 
> I'm trying to cut a raster (geo tif) using a polygon shape. Both are in the same reference system. The polygon is not a regular polygon, but has many vertex.
> I'm using raster > extraction > clipper, but at the end I receive this error message
> ERROR 1: Unable to compute a transformation between pixel/line and georeferenced coordinates for /home/giacomo/Desktop/RSM/bordi.tif.
> There is no affine transformation and no GCPs.
> 
> Thank you
> 
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