[Gdal-dev] gdalwarp error

[Huajun Zhang]

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?

Thanks

Huajun Zhang




Frank Warmerdam <warmerdam at pobox.com> 
03/20/2007 01:40 AM

To
Huajun Zhang <huajun_zhang at usgs.gov>
cc
gdal-dev at lists.maptools.org
Subject
Re: [Gdal-dev] Assign projection to a tif image






Huajun Zhang wrote:
> 
> Hi,
> 
> Is there any method to define a projection to a image rather than 
> reproject the image with gdalwarp?

Huajun Zhang,

A projection can be attached to an image in the process of translating
it if the existing projection is wrong or if the input image lacks one
entirely.

For instance,

gdal_translate -a_srs '+proj=utm +zone=11 +datum=WGS84' in.tif out.tif

Is this the sort of operation you had in mind?

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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