Using QGIS 3.4, I am trying to merge multiple DEMs downloaded from the National Map Viewer that are in ArcGRID format (Arc/Info Binary Grid). The output will be a large file so I can't use any of the formats limited to 2 or 4GB in size. I would like to save it as a BigTIFF but I don't know how to distinguish that from a TIFF in the merge raster dialogue box. I tried to save it as TIFF but it failed as file was over 4GB.

How do I save merged rasters as BigTIFF or, if this is not possible, how do I merge rasters to produce the smallest possible file size?

  • Maybe you could use a VRT file created with gdalbuildvrt? – Alex Hajnal Nov 10 '18 at 1:38

See the command that the tool is generating to the "GDAL/OGR console call" box. Read GeoTIFF driver documentation https://www.gdal.org/frmt_gtiff.html and edit the command by adding one more option -co BIGTIFF=YES for forcing BigTIFF.

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  • Thank you 30184. I usually use ArcMap, not Q, and I am not sure how I access the tools command parameters? – sparky Nov 14 '18 at 16:06
  • To be more specific, I don't see how I can edit them. When I click in the GDAL/OGR console call, it doesn't allow me to edit the command. – sparky Nov 14 '18 at 16:13
  • 1
    Press + in the Additional creation options panel and write "bigtiff" as a name and "yes" as a value. The command should update. – user30184 Nov 14 '18 at 20:06
  • I added also a screenshot. – user30184 Nov 15 '18 at 7:31

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