I've downloaded some dem tiles from here http://www.granit.unh.edu/data/search?dset=dem/dem174, which I'd like to merge into a single smooth digital elevation model usinq QGIS.

So far I've tried to use the raster merge function (gdal_merge.py) with default options. The merge is successful, but null value bands are introduced between the original dem extents that are actually larger than I would have expected from viewing the tiles separately.

How do I get rid of these gaps?

  • You can try building a virtual raster. Go to Raster/miscellaneous/build virtual raster (catalog) – Gerardo Jimenez Aug 27 '13 at 22:11
  • Virtual raster is better, but there are still a few 1-2 cell gaps here and there... – user1521655 Aug 29 '13 at 17:12

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