[gdal-dev] CTable2 documentation

[Kristian Evers]

> That must be some developper sense of humour.

Consider that my attempt at nudging the GDAL community to improve their documentation :-)

/Kristian

> On 19 Jun 2018, at 21:05, Erik Sørngård <erik.sorngard at gl-instrumenter.no> wrote:
> 
> Hello Even,
> 
> Thank you clarifying that PROJ documentation is not accurate. I had seen the source code before, but was hoping for a supporting document as well.
> 
> Based on your input and looking at the source code again today, I expect the data to be stored as longitude and latitude offset pairs, each value being a 32 bit floating point number in radians, with east to west lines, from south to north.
> 
> Regards,
>  
> Erik Sørngård
> R&D Manager
> Gundersen & Løken AS
>  
> E: erik.sorngard at gl-instrumenter.no
> P: +47 22 81 39 94
> 
> -----Original Message-----
> From: Even Rouault [mailto:even.rouault at spatialys.com] 
> Sent: Tuesday, June 19, 2018 6:14 PM
> To: gdal-dev at lists.osgeo.org
> Cc: Erik Sørngård <erik.sorngard at gl-instrumenter.no>
> Subject: Re: [gdal-dev] CTable2 documentation
> 
> Erik,
> 
>> 
>> I have been looking at PROJ's support for grid files, and notice that 
>> they refer to "GDAL documentation" for format details about CTable2.
>> 
>> While browsing the GDAL site I have so far not been able to locate 
>> this information, except for being part of the list of supported file formats:
>> http://www.gdal.org/formats_list.html
>> 
>> Where can we find the CTable2 documentation?
> 
> That must be some developper sense of humour. To the best of my knowledge, the best documentation of the CTable2 format is the driver source code:
> 
> https://github.com/OSGeo/gdal/blob/master/gdal/frmts/raw/ctable2dataset.cpp
> 
> Basically there is a 160-byte header, followed by the longitude and latitude offsets, interleaved, and with south-to-north line ordering.
> 
> Even
> 
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