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I'd like to use the DEM SRTM 1-arc second (Version 4, 30m) from USGS for Europe. Unfortunately there are some voids. My idea is to fill those voids using the void-filled version 3 (90m) by resampling it to 30m and inserting the missing data in the version 4 DEM.

As I'm new to QGIS I don't know the proper steps. I already got a 30m map by reprojecting the dimensions times three but I'm not sure if that's the right thing to do and I have no idea how to fill the voids afterwards.

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    Only about how to fill the voids... there are patch tools in QGIS Processing Toolbox. One is GRASS r.patch and another is SAGA Patching in Raster tools. My recommendation is SAGA tool (just because I have difficulty running r.patch). – Kazuhito May 1 '17 at 8:27

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