Le jeudi 18 juillet 2013 23:05:45, Markus Müller a écrit : > Hi Frank, > > thanks for the reply. I did as you suggested and gdalsrsinfo acts > accordingly. > > > >>> > gdalsrsinfo '+proj=rhealpix -I +lon_0=0 +a=1 +ellps=WGS84 +npole=0 +spole=0 > +wktext' > > > PROJ.4 : '+proj=rhealpix -I +lon_0=0 +a=1 +ellps=WGS84 +npole=0 +spole=0 > +wktext' > > > OGC WKT : > PROJCS["unnamed", > GEOGCS["WGS 84", > DATUM["unknown", > SPHEROID["WGS84",6378137,298.257223563]], > PRIMEM["Greenwich",0], > UNIT["degree",0.0174532925199433]], > PROJECTION["custom_proj4"], > EXTENSION["PROJ4","+proj=rhealpix -I +lon_0=0 +a=1 +ellps=WGS84 > +npole=0 +spole=0 +wktext"]] > > >>> > > > I then tried the same with gdalwarp (on one of the examples file that comes > with GDAL) > > > >>> > gdalwarp -s_srs EPSG:26711 -t_srs '+proj=rhealpix -I +lon_0=0 +a=1 > +ellps=WGS84 +npole=0 +spole=0 +wktext' ~/data/utm_orig.tif rhealpix.tif > Processing input file /home/markus.mueller/data/utm_orig.tif. > ERROR 6: Failed to initialize PROJ.4 with `+proj=rhealpix -I +lon_0=0 +a=1 > +ellps=WGS84 +npole=0 +spole=0 +wktext'. > 0...10...20...30...40...50...60...70...80...90...100 - done. > > >>> > > > It produces an output file though. Should I be concerned about the created > error or can I ignore it?
Markus, Yes, you shouldn't ignore this error. Ideally gdalwarp shouldn't complete when such an error occurs. I'll look at that. First, you should also remove the '-I' parameter. It is a argument of the proj command line utility, not a parameter of a PROJ.4 projection string. Secondly, looking at PROJ history ( http://trac.osgeo.org/proj/log/trunk/proj/src/PJ_healpix.c and http://trac.osgeo.org/proj/log/tags/4.8.0?rev=2377 ), I see that this projection was only introduced in PROJ 4.8.0, so check your PROJ.4 version. I also see that a few fixes have been pushed after the 4.8.0 release, so if you run into bugs, you might need to compile the trunk version of the svn repository. Best regards, Even -- Geospatial professional services http://even.rouault.free.fr/services.html _______________________________________________ gdal-dev mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/gdal-dev
