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how can we create a DEM in QGIS from point data in CSV files? A similar problem was discussed here, using a shp-file. Our CSV's are too big, so that dxf2shp crashes. So we are looking for another way to do this.

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Harald
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  • Had the same issue some time ago and used GRASS GIS sucessfully, as proposed by the answer to my question here: http://gis.stackexchange.com/questions/140683/proof-low-deviations-in-dem-compared-to-point-dataset – ulrich Mar 01 '16 at 14:42
  • "Our CSV's are too big, so that dxf2shp crashes".A dxf and a CSV are different things. Try to load your points with the add delimited text layer option, assing the proper coordinate system and save your points as a shape file (I am assuming they have some sort of z value). The you can use the interpolation option in the raster menu – Gerardo Jimenez Mar 01 '16 at 18:01
  • @tareq: Thanks a lot. But ... too many errors while installing GRASS. I just found it why: CURRENT GRASS BINARIES MAY NOT WORK WITH EL CAPITAN - OS X 10.11.... So I have to search for a solution with QGIS... – Harald Mar 01 '16 at 18:14
  • are you able to install SAGA GIS on El Capitan? If so, it should let you do this quite easily. Also, what do you mean by a large file, how many points (lines)? – Steven Kay Mar 01 '16 at 23:08
  • @StevenKay: There are more 100k lines. If I convert it to DXF, then the DXF is more than 300 MB... SAGA GIS: I try to install it right now, using fink, but I can see a huge amount of warnings .... – Harald Mar 02 '16 at 14:40

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While I can't be certain without seeing your files and knowing the number of lines etc. you should be able to do this using the gdal_grid utility.

Ian Turton
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