I am new to QGIS and I am trying to import more than 700 xyz (it is the same as ASCII?) files into the map so I can get a digital elevation model and then get the average elevation for some small polygons. I can simply import individual xyz file but importing more at once doesn't work for me?
I would like to make something such as a virtual raster catalog but I get:
Warning 6: gdalbuildvrt does not support positive NS resolution.
My files look like this: (they have no headers)
383000.0 97000.0 83.30
383005.0 97000.0 82.80
383010.0 97000.0 82.70...
Joseph
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Welcome to GIS:SE @Ivan! Perhaps these posts might help: How do you import simple xyz in QGIS; and Create a Raster file out of a ASCII grid file?Joseph– Joseph2016年10月11日 09:36:14 +00:00Commented Oct 11, 2016 at 9:36
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Does your data fulfill the ordering rules from gdal.org/frmt_xyz.html and gis.stackexchange.com/questions/115024/…? If yes, use gdal_transform -of VRT first, then gdalbuildvrt.AndreJ– AndreJ2016年10月11日 14:40:14 +00:00Commented Oct 11, 2016 at 14:40
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Possible duplicate of gis.stackexchange.com/questions/64471/…. See also trac.osgeo.org/gdal/ticket/5601 for a workaround.AndreJ– AndreJ2016年10月11日 14:42:32 +00:00Commented Oct 11, 2016 at 14:42