Denis Rykov wrote:
I'm trying export raster from HDF-EOS to GeoTIFF. At result I have
GeoTiff with 143 numbers of GCP.
There are some thousands GCP at HDF-EOS geolocation SDS. Is OGR drivers
support only 143 GCP?
Denis,
Normally the HDF4 driver takes only a subset of GCPs to keep the number
managable. The logic looks like:
/* -------------------------------------------------------------------- */
/* Determine whether to use no, partial or full GCPs. */
/* -------------------------------------------------------------------- */
const char *pszGEOL_AS_GCPS = CPLGetConfigOption( "GEOL_AS_GCPS",
"PARTIAL" );
int iGCPStepX, iGCPStepY;
if( EQUAL(pszGEOL_AS_GCPS,"NONE") )
{
iGCPStepX = iGCPStepY = 0;
}
else if( EQUAL(pszGEOL_AS_GCPS,"FULL") )
{
iGCPStepX = iGCPStepY = 1;
}
else
{
// aim for 10x10 grid or so.
iGCPStepX = MAX(1,((nXPoints-1) / 11));
iGCPStepY = MAX(1,((nYPoints-1) / 11));
}
So if you want them all you can set the configuration variable
GEOL_AS_GCPS to FULL either in the environment or as a commandline
switch ("--config GEOL_AS_GCPS FULL").
Best regards,
--
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I set the clouds in motion - turn up | Frank Warmerdam, [email protected]
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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