Thanks.
I took the code you mentioned, installed the gdal libdev and run G++ on
it and voila!
Etienne Tourigny schreef op 2013-04-17 13:48:
You can have a look at the code used by the gdalsrsinfo , which
basically opens a GDAL/OGR datasource and outputs the proj4 (or wkt)
string.
Assuming you use c/c++ of course...
http://trac.osgeo.org/gdal/browser/trunk/gdal/apps/gdalsrsinfo.cpp [2]
Here is the relevant code (some declarations missing)
poGDALDS = (GDALDataset *) GDALOpen( pszInput, GA_ReadOnly );
if ( poGDALDS != NULL && poGDALDS->GetProjectionRef( ) != NULL ) {
pszProjection = (char *) poGDALDS->GetProjectionRef( );
if( oSRS.importFromWkt( &pszProjection ) == CE_None ) {
CPLDebug( "gdalsrsinfo", "got SRS from GDAL" );
bGotSRS = TRUE;
}
GDALClose( (GDALDatasetH) poGDALDS );
if ( ! bGotSRS )
CPLDebug( "gdalsrsinfo", "did not open with GDAL" );
}
oSRS.exportToProj4( &pszOutput );
printf( "'%s'n", pszOutput );
On Wed, Apr 17, 2013 at 8:23 AM, wsvries <[email protected]> wrote:
Hi,
I am working on an application (adding terrain info to maps for 3D
rendering) that does some heavy projection calculations using the
proj4 libs.
Input for now is geotiff.
I have Googled a lot, but I was not able to find any libs that can
output proj4 strings based on geotiff input.
I have seen (GDAL based) utilities that are able to do that but no
libs to use in my application.
Any hint is welcome.
Thanks.
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[2] http://trac.osgeo.org/gdal/browser/trunk/gdal/apps/gdalsrsinfo.cpp
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