Frank Warmerdam schrieb: > On Tue, Sep 30, 2008 at 10:55 PM, Tom Kazimiers <[EMAIL PROTECTED]> wrote: > >> Hi, >> >> unfortunately I have no experience with OGR and want to display a >> SHP-File (on WinCE, but I don't think that matters). The rendering works >> well, but is slow - so I will add some caching. One thing of faster >> rendering is to use SetSpatialFilterRect() I guess. This works, as >> written in the docs, with comparing the coorinates (they must be in the >> same coorinate systeme). Sadly, my shp files do not have any >> SpatialReference (I get NULL returned from OGRLayer::GetSpatialRef() ). >> If I use SetSpatialFilterRect() with this shp file datasource I will get >> back absolutely no features. I thought the reason for this could be the >> missing spatial referenc. So I wonder how to add/change a spatial >> reference (e. g. a coorinate interpretation, right?) to a layer? >> > > Tom, > > In fact there is no GDAL way to do this. You can however manually > put a .prj file with an ArcGIS PE string along side the shapefiles. > > Best regards, > > Frank,
thanks for the answer. So does this actually mean I have to look if there is a .prj file - if not create one by myself (maybe ask the user for the parameters) and then load the file with OGR? And if a spatial reference of a layer is NULL I have to create also a (new) .prj file (in case of the one provided is damaged). thanks, regards, Tom _______________________________________________ gdal-dev mailing list gdal-dev@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/gdal-dev
