[gdal-dev] Problems with GDAL_GRID

[Dave Burkholder]

I am hoping that someone receiving this email might be able to help me or direct me to someone else who can. Please excuse me if this is an inappropriate use of your mailing list or attachment format.

I am attempting to use GDAL_GRID with linear interpolation to generate a TIF-file and polygonized SHP-file, from a TXT-file of 3D point data generated by a single-beam echo-sounder which collects detailed river cross-sections typically at every 50 - 100 m intervals down a river.

We currently have a database of over 2100 bathymetric (underwater) surveys and have been successfully using an ArcGIS macro, but for a number of reasons I was hoping to migrate away from ArcGIS and use GDAL_GRID instead for batch input. The point data files work fine in both QGIS and ArcGIS, but not in GDAL_GRID. I am continuously getting 'blocks' of random 'No Data'-areas in my output (refer to attachment). I am wondering if this is a flaw in the GDAL_GRID program or if I am not using it correctly, and whether there is an alternative program that might be more stable.

I have prepared a PDF file which documents and summarizes the problem if anyone is interested.

Any advise you might be able to give me would be MUCH appreciated!

Thank you in advance.

Regards, David Burkholder


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