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]
> <[email protected]> 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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