[gdal-dev] Opening gridded xyz data that is out of order

[Richard Barnes]

I wonder if GDAL shouldn't suggest sorting as a means of fixing the issue,
possibly with Mark's command?

On Sep 11, 2017 7:32 AM, "Andreas Neumann" <a.neumann at carto.net> wrote:

> Hi Mark (and others),
>
> Your sort command worked like a charm. It was also very fast!
>
> Now gdalinfo produces this nice information output:
>
> Driver: XYZ/ASCII Gridded XYZ
> Files: dtmav_sorted.xyz
> Size is 5000, 5000
> Coordinate System is `'
> Origin = (2708000.000000000000000,1210000.000000000000000)
> Pixel Size = (2.000000000000000,2.000000000000000)
> Corner Coordinates:
> Upper Left  ( 2708000.000, 1210000.000)
> Lower Left  ( 2708000.000, 1220000.000)
> Upper Right ( 2718000.000, 1210000.000)
> Lower Right ( 2718000.000, 1220000.000)
> Center      ( 2713000.000, 1215000.000)
> Band 1 Block=5000x1 Type=Float32, ColorInterp=Undefined
>   Min=728.210 Max=2294.290
>   NoData Value=0
>
> Now I can open this in QGIS as a normal data source and simply safe as a
> GeoTIFF file.
>
> Thanks a lot to all who answered so quickly!
>
> Glad that a simple sort command on the command line helped to solve the
> issue! I will contact the data provider and ask them if they could deliver
> this data in an already sorted form so that GDAL recognizes it as gridded
> data.
>
> Andreas
>
> On 11.09.2017 16:12, Mark Johnson wrote:
>
> 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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