[Gdal-dev] Re: gdalwarp error

[Huajun Zhang]

Thanks, Frank. It works now. But the cellsize of the image was changed a 
little bit (e.g. cellsize of the original image is 14.25, the cellsize is 
changed to 14.33 after gdalwarp). Do you have any idea what the problem 
is?

Thanks

Huajun 




Frank Warmerdam <warmerdam at pobox.com> 
03/21/2007 03:57 PM

To
Huajun Zhang <huajun_zhang at usgs.gov>
cc
gdal-dev at lists.maptools.org
Subject
Re: gdalwarp error






Huajun Zhang wrote:
> 
> Thank you very much, Frank. I met another problem when I use gdalwarp:
> 
> gdalwarp -t_srs '+proj=aea +lat_1=29.50 +lat_2=45.50 +lat_0=23.00 
> +lon_0=-96.00 +x_0=0.000 +y_0=0.000 +ellps=GRS80 +units=m +datum=NAD83' 
> abl.sid abl.img
> 
> I got the error message:
> 
> ERROR 1: Translating source or target SRS failed: '+proj=aea
> 
> I tried to use C API, I followed the gdalwarp API tutorial, the 
> reprojection does not get the correct result either:
> 
>  OGRSpatialReference oSRS;
> 
>  oSRS.SetProjCS( "Albers Conical Equal Area" );
>  oSRS.SetACEA( 29.5, 45.5, 23.0, -96.0, 0.0, 0.0);
>  oSRS.SetWellKnownGeogCS( "NAD83" );
>  oSRS.exportToWkt( &pszDstWKT );
> 
> Do you have any idea?

Huajun,

The error message looks like the issue has to do with quoting.  Are you by
any chance on windows?  If so, you will need to use double quotes to hold
an argument to -t_srs together.

I'm not clear in what way the C API code failed for you.

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    | President OSGeo, http://osgeo.org

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