[FWTools] crs definition with both +nadgrids and +towgs84 parameters

Frank Warmerdam warmerdam at pobox.com
Fri Jan 9 08:51:35 EST 2009

SAEZ Laurent - CETE Méditerr./DI/ETER wrote:
> Hi list,
> Someone could tell me what appens if +nadgrids and +towgs84 are both  
> used in a crs
> definition (e.g. in the EPSG file) ?
> Which parameter is taken into account ?
> Is the behavior the same in all tools (cs2cs, ogr utilities, gdal  
> utilities, mapserver,PostGIS...) ?


I do not know which takes precidence ... the only answer I would trust would
be one based on experimentation, so you might as well experiment.

GDAL/OGR's parsing of PROJ.4 strings is likely to be different than their
direct use in PROJ.4 itself.

Best regards,

I set the clouds in motion - turn up   | Frank Warmerdam, warmerdam at pobox.com
light and sound - activate the windows | http://pobox.com/~warmerdam
and watch the world go round - Rush    | Geospatial Programmer for Rent

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