Jay,
On Fri, Jun 12, 2015 at 11:21 AM, Kyle Shannon <[email protected]> wrote: > Jay, > > > On Fri, Jun 12, 2015 at 10:59 AM, Jay L. <[email protected]> wrote: >> Using GDAL 1.11.2 (Anaconda Python osgeo binstar install). >> >> I have a WKT projection: >> 'PROJCS["Mercator",GEOGCS["GCS_Moon_2000",DATUM["D_Moon_2000",SPHEROID["Moon_2000_IAU_IAG",1737400.0,0.0]],PRIMEM["Reference_Meridian",0.0],UNIT["Degree",0.0174532925199433]],PROJECTION["Mercator"],PARAMETER["False_Easting",0.0],PARAMETER["False_Northing",0.0],PARAMETER["Central_Meridian",180.0],PARAMETER["Standard_Parallel_1",0.0],UNIT["Meter",1.0]]' >> >> I import this into a srs object and attempt to export to Proj4. This is >> throwing: >> >> RuntimeError: No translation for Mercator to PROJ.4 format is known. > > OGRSpatialReference needs a specific Mercator projection such as: > Mercator_1SP, Mercator_2SP, etc. Use Mercator_1SP in your case for > the PROJECTION parameter. > >> >> Along the same lines, I am trying to compute pixel to latlon and the >> inverse. So I need a transformation object. No problem setting that up >> until: >> >> RuntimeError: Failed to initialize PROJ.4 with `+proj=merc +lon_0=0 +k=0 >> +x_0=0 +y_0=0 +a=3396190 +b=3376200 +units=m +no_defs '. >> >> Which leads me to try: >> >> gdalsrsinfo -V '+proj=merc +lon_0=0 +k=0 +x_0=0 +y_0=0 +a=3396190 +b=3376200 >> +units=m +no_defs' >> >> Validate Succeeds >> >> PROJ.4 : '+proj=merc +lon_0=0 +k=0 +x_0=0 +y_0=0 +a=3396190 +b=3376200 >> +units=m +no_defs ' >> >> OGC WKT : >> PROJCS["unnamed", >> GEOGCS["unnamed ellipse", >> DATUM["unknown", >> SPHEROID["unnamed",3396190,169.894447223611]], >> PRIMEM["Greenwich",0], >> UNIT["degree",0.0174532925199433]], >> PROJECTION["Mercator_1SP"], >> PARAMETER["central_meridian",0], >> PARAMETER["scale_factor",0], >> PARAMETER["false_easting",0], >> PARAMETER["false_northing",0], >> UNIT["Meter",1]] >> >> So gdalsrsinfo is able to validate the proj4 string. > > gdalsrsinfo can't validate the WKT though, without the Mercator_1SP > >> >> Any ideas? >> >> >> _______________________________________________ >> gdal-dev mailing list >> [email protected] >> http://lists.osgeo.org/mailman/listinfo/gdal-dev > > > > -- > Kyle Mercator is a valid key in the ESRI WKT dialect: Type "copyright", "credits" or "license()" for more information. >>> from osgeo import osr >>> wkt = >>> 'PROJCS["Mercator",GEOGCS["GCS_Moon_2000",DATUM["D_Moon_2000",SPHEROID["Moon_2000_IAU_IAG",1737400.0,0.0]],PRIMEM["Reference_Meridian",0.0],UNIT["Degree",0.0174532925199433]],PROJECTION["Mercator"],PARAMETER["False_Easting",0.0],PARAMETER["False_Northing",0.0],PARAMETER["Central_Meridian",180.0],PARAMETER["Standard_Parallel_1",0.0],UNIT["Meter",1.0]]' >>> srs1 = osr.SpatialReference() >>> srs1.ImportFromWkt(wkt) 0 >>> srs1.ExportToProj4() '' >>> srs1.MorphFromESRI() 0 >>> srs1.ExportToProj4() '+proj=merc +lon_0=180 +k=1 +x_0=0 +y_0=0 +a=1737400 +b=1737400 +units=m +no_defs ' The osr.SpatialReference.MorphFromESRI() should do the job too. -- Kyle _______________________________________________ gdal-dev mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/gdal-dev
