On Fri, 13 Jul 2012 11:22:13 +0200, Even Rouault wrote: > > I have added a new projection to PROJ4 (ticket #179), and would like > > to use it with GDAL Warp. > > > > For this purpose, I use the string > > "+proj=qsc +a=6378137.0 +b=6356752.314245 +lat_0=90 +lon_0=0 > > +units=m" as an argument to the -t_srs option of gdalwarp, and also > > to OGRSpatialReference::importFromProj4() for passing the result to > > the Warp API. > > > > However, this requires explicit support for the projection not just > > in PROJ4, but also in GDAL. I currently use the attached patch to > > add that support, but is there a way to avoid patching GDAL for this > > purpose? > > To preserve a proj4 string intact through GDAL, you need to add the > "+wktext" option at the end of the proj.4 string. Unfortunately, > until recently > ( http://trac.osgeo.org/gdal/changeset/24063/trunk/gdal/ogr/ogr_srs_proj4.cpp > which will be released in GDAL 2.0 ), this would still require GDAL > to be able to recognize the projection method.
Thank you very much Even, this is exactly what I was looking for. I just tested it with the latest GDAL from SVN and it works perfectly both with gdalwarp and with the Warp API. > At first sight, your patch to add support for the qsc method looks > good (except that I believe that, for consistency with other SRS, the > words in the SRS_PT_QSC string should be separated with underscore > rather than space. Would you mind opening a ticket in GDAL Trac with > it attached. I could certainly do that, but with the '+wktext' mechanism, there is no reason to add this patch anymore, is there? Best regards, Martin _______________________________________________ gdal-dev mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/gdal-dev
