[gdal-dev] Units of dimension variable in NetCDF is 'km'

[Kyle Shannon]

What version are you using?  I seem to remember something like this in a
ticket I filed.  I thought it was fixed in 1.9.1.

kss

On Tue, Aug 7, 2012 at 5:38 AM, Etienne Tourigny <etourigny.dev at gmail.com>wrote:

> Hi,
>
> km units are supposed to work...
>
> Here is the code where "km" units are detected, which set the WKT
> units to 1000m.
>
>             /* add units to PROJCS */
>             if ( pszUnits != NULL && ! EQUAL(pszUnits,"") ) {
>                 if ( EQUAL(pszUnits,"m") ) {
>                     oSRS.SetLinearUnits( CF_UNITS_M, 1.0 );
>                     oSRS.SetAuthority( "PROJCS|UNIT", "EPSG", 9001 );
>                 }
>                 else if ( EQUAL(pszUnits,"km") ) {
>                     oSRS.SetLinearUnits( CF_UNITS_M, 1000.0 );
>                     oSRS.SetAuthority( "PROJCS|UNIT", "EPSG", 9001 );
>                 }
>
> What does the wkt actually look like?
>
> Also running gdalinfo --debug ON <file.nc> can give a few hints.
>
> It would be good for you to send me a link to the file or attach it to
> a bug report (add me as cc).
>
> Etienne
>
> On Tue, Aug 7, 2012 at 6:10 AM, Anton Korosov <anton.korosov at nersc.no>
> wrote:
> > Dear Etienne,
> >
> > I faced the following problem with the NetCDF driver:
> > Units of the dimension variables are 'km' and values in the SRS are in
> > meters, of course (e.g. Earth radius). Hence the calculated GeoTransform
> is
> > 1000 times less than should be and the calculate latlons are incorrect.
> > However 'units' attribute is given, besides AFAIK CF-conventions allow to
> > have 'k' (kilo) preceding 'm' (meters) in the units.
> >
> > Can you please give me a hint where to fix that in the driver so that it
> can
> > adequately interpret units of the dimensions?
> >
> > With best regards!
> > Anton
> >
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