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I have 10 meter DEM model with holes on the borders. I also have full 30m DEM model. The DEMs are in different coordinate system. transform 10m coordinate system to the same coordinate system as 30m meter slice a 0.1 x 0.1 degree tiff with gdal_translate - gdal_translate -projwin 5 48.10 5.10 48 -ot Int16 -r bilinear bigTiff.tiff slice.tiff slice a 0.1 x ...


I think a way to achieve what you're trying to do is gdal_merge.py (i.e., a Python command line tool, see http://www.gdal.org/gdal_merge.html). In case of overlap, that tool will take the cells of the last named raster rather than those of any previous rasters, so listing the 10m raster last will ensure it's values are used when there's overlap. In that case ...

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