You must sort the data beforehand - the y position must be sorted properly (ASC or DESC)
Standard linux sort program: sort -k2 -n -k1 392_5810.xyz -o 392_5810.sort.xyz (2nd column (y) as numeric, then first column (x) -o = output file As a zip file you can also do: unzip -p 390_5820.zip | sort -k2 -n -k1 -o ../xyz/390_5820.dhhn92.txt that would deal with problem in 1 step. ogr needs to know the range/area to build (minx,miny,maxx, maxy), so when the y switches it assumes a new column. Mark
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