[gdal-dev] Assigning SpatialReference to OGRLayer

[Even Rouault]

You cannot do that. The layer can set the spatial reference when building its 
definition, but the user cannot change that.

You could achieve this by wrapping your layer into a OGR VRT though. See 
http://gdal.org/ogr/drv_vrt.html

But for shapefiles, the easier will be to write a .prj file. You can use the 
OGRSpatialReference for that (see 
http://gdal.org/ogr/classOGRSpatialReference.html ) . Namely the  
morphToESRI() and exportToWkt() should be of great help to get the ESRI WKT 
string to write into the .prj

Le lundi 23 août 2010 20:41:55, Anders Moe a écrit :
> Hi everyone
> 
> I was wondering how I should assign a spatial reference to my OGRLayer.
> 
> virtual
> OGRSpatialReference<http://www.gdal.org/ogr/classOGRSpatialReference.html>
> *
> OGRLayer::GetSpatialRef<http://www.gdal.org/ogr/classOGRLayer.html#75c06b4
> 993f8eb76b569f37365cd19ab> ()
> 
> 
> There  seems to be no SetSpatialRef method. The current spatial reference
> is null, since it was imported from a shapefile without spatial ref, so I
> can not simply fill in the values of the existing sref object. I tried
> assigning to each geometry, but this seems less than elegant, and the
> layer still returns 0.
> 
> Thanks in advance,
> Anders