Super cool. Thanks! On Fri, Jun 12, 2015 at 10:29 AM, Kyle Shannon <[email protected]> wrote:
> 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 >
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