Re: [gdal-dev] gdalwarp -t_srs problems SOLVED

Thu, 25 Feb 2010 04:53:15 -0800

Zoltan Szecsei wrote:

I've tried various -t_srs permutations trying to convert a tiff ortho from LATLONG to UTM34S but I keep ending up with PROJCS in the Northern hemisphere, even though the Corner Coordinates show a latitude in the South. The UTM coords are not in the expected value range, either.

Note I am not using -s_srs as I am expecting that from the TIFF headers.

gdalwarp    -t_srs 'epsg:32734'     3319bc23.tif     bc23.tif
Notice the UTM zone, Central Meridian and False Northing in the target bc23.tif file.

The reason for this problem is that the coordinates embedded in the source tif image are garbage.
The image originates from a SID image, that is in Lo19 Gauss using Hartebeeshoek94  (epsg:2048)
On export Lizardtech's GeoViewer defaults to LatLong.

I was able to get the original SID & SDW files for the image, and noticed that it's contents were Gauss values, so I re-exported the image from GeoViewer, forcing use of the world files, and now everything is hunkey-dorey.

Thanks anyway.

Kind regards,
Zoltan





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Zoltan Szecsei
Director

Geograph (Pty) Ltd.
P.O. Box 7, Muizenberg 7950, South Africa.

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