[Gdal-dev] About OGR question

[=?GB2312?Q?=CC=EF=CE=C4=BE=FC?=]

  gdal-dev,

		Hello,My name is tian.I use your code about OGR,and find it very good for me .Thank you for your program.Now I 		have a question to ask you.

		I have the data Longitude and Latitude for map,but use your code:
 		
  		//////////
		OGRPoint *poPoint = new OGRPoint();
        
        poPoint->setX( x );
        poPoint->setY( y );
 
        poFeature->SetGeometryDirectly( poPoint ); 
		//////////
		This code is not for Longitude and Latitude's data,how can I convert between them?
		
		I find your code about :
 	////////////////
	OGRSpatialReference    oUTM, *poLatLong;
    OGRCoordinateTransformation *poTransform;

    oUTM.SetProjCS("UTM 17 / WGS84");
    oUTM.SetWellKnownGeogCS( "WGS84" );
    oUTM.SetUTM( 17 );

    poLatLong = oUTM.CloneGeogCS();
    
    poTransform = OGRCreateCoordinateTransformation( &oUTM, poLatLong );
    if( poTransform == NULL )
    {
        ...
    }
    
    ...

    if( !poTransform->Transform( nPoints, x, y, z ) )
    ...
///////////////////

		But this code can't help me .The oUTM can't be initialization.


	So can you help me about this question,I have the Longitude = 116 ,and Latitude = 39,How I transform it to x,y,z.

Thank you.