[GRASS-user] Create outer line of raster

[Stefan Sylla]

Hi Paul,

you could also use the original ECW-file as a mask in GRASS:

g.copy ecw_sample,MASK

and then any action you will perform for raster processing will only be
within that Mask (assuming the ECW-file does not have any NULL-values
inside).

Stefan


2013/1/9 Paul Meems [via OSGeo.org] <ml-node+s1560n5026252h60 at n6.nabble.com>

>  Hi List,
>
> I have an ECW-file which I convert to GeoTiff using gdal_translate.
> This GTiff file I use in GeoServer as a base map.
>
> This is working great, but because I compress the GTiff with JPEG I get
> white borders around my area. To solve this I can clip my GTiff with the
> outer line of my original ECW file.
>
> My question is how to create such an outer line. I can of course draw it
> myself using QGis or MapWindow but I'd prefer to let it calculated.
> Can GRASS do this? If so which command do I need.
>
> Thanks,
>
> Paul
>
>
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