Re: GDAL NetCDF driver and projection.

[John Caron <caron@xxxxxxxxxxxxxxxx>]

Hi Denis:

CF has unfortunately not yet dealt with datum issues, but its on our list to 
tackle.

Denis Nadeau wrote:
> Hi All,
>
> I would like to have suggestions from the community on the current needs 
> for the GDAL NetCDF driver.  I am currently writing the CreateCopy 
> method to allow people to convert from any GDAL supported format to 
> NetCDF CF-1 convention format. 
>
> At this point I am stuck with projection issues.  How should I handle 
> DATUM, SPHEROID and AUTHORITY?  I can produce a lat lon arrays to 
> reproject the projected coordinates to lat/lon space but that may be 
> expensive in cpu and space. 
>
> I am thinking as well to create an array containning the GeoTransform 
> values if found in the source file.
>
>      adfGeoTransform[0] /* top left x */
>      adfGeoTransform[1] 
> /* w-e pixel resolution */
>      adfGeoTransform[2] /* rotation, 0 if image is "north up" */
>      adfGeoTransform[3] /* top left y */
>
>      adfGeoTransform[4] /* rotation, 0 if image is "north up" */
>      adfGeoTransform[5] /* n-s pixel resolution */
>
>
> Thanks for your suggestion,
>
> Best Regards,
> Denis Nadeau