void GRIBDataset::SetGribMetaData(grib_MetaData* meta)
{
nRasterXSize = meta->gds.Nx;
nRasterYSize = meta->gds.Ny;
/* -------------------------------------------------------------------- */
/* Image projection. */
/* -------------------------------------------------------------------- */
OGRSpatialReference oSRS;
switch(meta->gds.projType)
{
case GS3_LATLON:
case GS3_GAUSSIAN_LATLON:
// No projection, only latlon system (geographic)
break;
case GS3_MERCATOR:
oSRS.SetMercator(meta->gds.meshLat, meta->gds.orientLon,
1.0, 0.0, 0.0);
break;
case GS3_POLAR:
oSRS.SetPS(meta->gds.meshLat, meta->gds.orientLon,
meta->gds.scaleLat1,
0.0, 0.0);
break;
case GS3_LAMBERT:
oSRS.SetLCC(meta->gds.scaleLat1, meta->gds.scaleLat2,
0.0, meta->gds.orientLon,
0.0, 0.0); // set projection
break;
case GS3_ORTHOGRAPHIC:
//oSRS.SetOrthographic(0.0, meta->gds.orientLon,
// meta->gds.lon2, meta->gds.lat2);
//oSRS.SetGEOS(meta->gds.orientLon, meta->gds.stretchFactor, meta->gds.lon2, meta->gds.lat2);
oSRS.SetGEOS( 0, 35785831, 0, 0 ); // hardcoded for now, I don't know yet how to parse the meta->gds section
break;
case GS3_EQUATOR_EQUIDIST:
break;
case GS3_AZIMUTH_RANGE:
break;
}
/* -------------------------------------------------------------------- */
/* Earth model */
/* -------------------------------------------------------------------- */
double a = meta->gds.majEarth * 1000.0; // in meters
double b = meta->gds.minEarth * 1000.0;
if( a == 0 && b == 0 )
{
a = 6377563.396;
b = 6356256.910;
}
if (meta->gds.f_sphere)
{
oSRS.SetGeogCS( "Coordinate System imported from GRIB file",
NULL,
"Sphere",
a, 0.0 );
}
else
{
double fInv = a/(a-b);
oSRS.SetGeogCS( "Coordinate System imported from GRIB file",
NULL,
"Spheroid imported from GRIB file",
a, fInv );
}
OGRSpatialReference oLL; // construct the "geographic" part of oSRS
oLL.CopyGeogCSFrom( &oSRS );
double rMinX;
double rMaxY;
double rPixelSizeX;
double rPixelSizeY;
if (meta->gds.projType == GS3_ORTHOGRAPHIC)
{
//rMinX = -meta->gds.Dx * (meta->gds.Nx / 2); // This is what should work, but it doesn't .. Dx seems to have an inverse relation with pixel size
//rMaxY = meta->gds.Dy * (meta->gds.Ny / 2);
const double geosExtentInMeters = 11137496.552; // hardcoded for now, assumption: GEOS projection, full disc (like MSG)
rMinX = -(geosExtentInMeters / 2);
rMaxY = geosExtentInMeters / 2;
rPixelSizeX = geosExtentInMeters / meta->gds.Nx;
rPixelSizeY = geosExtentInMeters / meta->gds.Ny;
}
else if( oSRS.IsProjected() )
{
rMinX = meta->gds.lon1; // longitude in degrees, to be transformed to meters (or degrees in case of latlon)
rMaxY = meta->gds.lat1; // latitude in degrees, to be transformed to meters
OGRCoordinateTransformation *poTransformLLtoSRS = OGRCreateCoordinateTransformation( &(oLL), &(oSRS) );
if ((poTransformLLtoSRS != NULL) && poTransformLLtoSRS->Transform( 1, &rMinX, &rMaxY )) // transform it to meters
{
if (meta->gds.scan == GRIB2BIT_2) // Y is minY, GDAL wants maxY
rMaxY += (meta->gds.Ny - 1) * meta->gds.Dy; // -1 because we GDAL needs the coordinates of the centre of the pixel
rPixelSizeX = meta->gds.Dx;
rPixelSizeY = meta->gds.Dy;
}
else
{
rMinX = 0.0;
rMaxY = 0.0;
rPixelSizeX = 1.0;
rPixelSizeY = -1.0;
oSRS.Clear();
CPLError( CE_Warning, CPLE_AppDefined,
"Unable to perform coordinate transformations, so the correct\n"
"projected geotransform could not be deduced from the lat/long\n"
"control points. Defaulting to ungeoreferenced." );
}
delete poTransformLLtoSRS;
}
else
{
rMinX = meta->gds.lon1; // longitude in degrees, to be transformed to meters (or degrees in case of latlon)
rMaxY = meta->gds.lat1; // latitude in degrees, to be transformed to meters
if (meta->gds.lat2 > rMaxY)
rMaxY = meta->gds.lat2;
rPixelSizeX = meta->gds.Dx;
rPixelSizeY = meta->gds.Dy;
}
adfGeoTransform[0] = rMinX;
adfGeoTransform[3] = rMaxY;
adfGeoTransform[1] = rPixelSizeX;
adfGeoTransform[5] = -rPixelSizeY;
CPLFree( pszProjection );
pszProjection = NULL;
oSRS.exportToWkt( &(pszProjection) );
}
OGRErr BAGDataset::ParseWKTFromXML( const char *pszISOXML )
{
OGRSpatialReference oSRS;
CPLXMLNode *psRoot = CPLParseXMLString( pszISOXML );
OGRErr eOGRErr = OGRERR_FAILURE;
if( psRoot == NULL )
return eOGRErr;
CPLStripXMLNamespace( psRoot, NULL, TRUE );
CPLXMLNode *psRSI = CPLSearchXMLNode( psRoot, "=referenceSystemInfo" );
if( psRSI == NULL )
{
CPLError( CE_Failure, CPLE_AppDefined,
"Unable to find <referenceSystemInfo> in metadata." );
CPLDestroyXMLNode( psRoot );
return eOGRErr;
}
oSRS.Clear();
const char *pszSRCodeString =
CPLGetXMLValue( psRSI, "MD_ReferenceSystem.referenceSystemIdentifier.RS_Identifier.code.CharacterString", NULL );
if( pszSRCodeString == NULL )
{
CPLDebug("BAG",
"Unable to find /MI_Metadata/referenceSystemInfo[1]/MD_ReferenceSystem[1]/referenceSystemIdentifier[1]/RS_Identifier[1]/code[1]/CharacterString[1] in metadata." );
CPLDestroyXMLNode( psRoot );
return eOGRErr;
}
const char *pszSRCodeSpace =
CPLGetXMLValue( psRSI, "MD_ReferenceSystem.referenceSystemIdentifier.RS_Identifier.codeSpace.CharacterString", "" );
if( !EQUAL( pszSRCodeSpace, "WKT" ) )
{
CPLError( CE_Failure, CPLE_AppDefined,
"Spatial reference string is not in WKT." );
CPLDestroyXMLNode( psRoot );
return eOGRErr;
}
char* pszWKT = const_cast< char* >( pszSRCodeString );
if( oSRS.importFromWkt( &pszWKT ) != OGRERR_NONE )
{
CPLError( CE_Failure, CPLE_AppDefined,
"Failed parsing WKT string \"%s\".", pszSRCodeString );
CPLDestroyXMLNode( psRoot );
return eOGRErr;
}
oSRS.exportToWkt( &pszProjection );
eOGRErr = OGRERR_NONE;
psRSI = CPLSearchXMLNode( psRSI->psNext, "=referenceSystemInfo" );
if( psRSI == NULL )
{
CPLError( CE_Failure, CPLE_AppDefined,
"Unable to find second instance of <referenceSystemInfo> in metadata." );
CPLDestroyXMLNode( psRoot );
return eOGRErr;
}
pszSRCodeString =
CPLGetXMLValue( psRSI, "MD_ReferenceSystem.referenceSystemIdentifier.RS_Identifier.code.CharacterString", NULL );
if( pszSRCodeString == NULL )
{
CPLError( CE_Failure, CPLE_AppDefined,
"Unable to find /MI_Metadata/referenceSystemInfo[2]/MD_ReferenceSystem[1]/referenceSystemIdentifier[1]/RS_Identifier[1]/code[1]/CharacterString[1] in metadata." );
CPLDestroyXMLNode( psRoot );
return eOGRErr;
}
pszSRCodeSpace =
CPLGetXMLValue( psRSI, "MD_ReferenceSystem.referenceSystemIdentifier.RS_Identifier.codeSpace.CharacterString", "" );
if( !EQUAL( pszSRCodeSpace, "WKT" ) )
{
CPLError( CE_Failure, CPLE_AppDefined,
"Spatial reference string is not in WKT." );
CPLDestroyXMLNode( psRoot );
return eOGRErr;
}
if( EQUALN(pszSRCodeString, "VERTCS", 6 ) )
{
CPLString oString( pszProjection );
oString += ",";
oString += pszSRCodeString;
if ( pszProjection )
CPLFree( pszProjection );
pszProjection = CPLStrdup( oString );
}
CPLDestroyXMLNode( psRoot );
return eOGRErr;
}
