That seems to have worked, thank you both very much! Cheers, Justin
On Wed, May 21, 2008 at 2:29 PM, Dane Springmeyer <[EMAIL PROTECTED]> wrote: > Justin, > > Paul's suggestion is spot on. I'd add that www.spatialreference.org is a > handy web api for that same trick. > > You can plug your some of your .prj text in the search like: > > http://www.spatialreference.org/ref/epsg/?search=NAD_1983_StatePlane_Maryland_FIPS_1900_Feet&srtext=Search+EPSG+References > > and get back: > > http://www.spatialreference.org/ref/epsg/102685/ > or > http://www.spatialreference.org/ref/epsg/102685/proj4/ > > > -dane > > > > > On May 21, 2008, at 10:19 AM, Paul Smith wrote: > >> On Wed, May 21, 2008 at 12:08 PM, Justin Palk <[EMAIL PROTECTED]> wrote: >>> >>> Layer SRS WKT: >>> PROJCS["NAD_1983_StatePlane_Maryland_FIPS_1900_Feet", >>> GEOGCS["GCS_North_American_1983", >>> DATUM["North_American_Datum_1983", >>> SPHEROID["GRS_1980",6378137.0,298.257222101]], >>> PRIMEM["Greenwich",0.0], >>> UNIT["Degree",0.0174532925199433]], >>> PROJECTION["Lambert_Conformal_Conic_2SP"], >>> PARAMETER["False_Easting",1312333.333333333], >>> PARAMETER["False_Northing",0.0], >>> PARAMETER["Central_Meridian",-77.0], >>> PARAMETER["Standard_Parallel_1",38.3], >>> PARAMETER["Standard_Parallel_2",39.45], >>> PARAMETER["Latitude_Of_Origin",37.66666666666666], >>> UNIT["Foot_US",0.3048006096012192]] >> >>> m = Map(1024,1024,"+proj=lcc +datum=NAD83") >> >> I suspect that the 'srs' argument to the Map constructor does not give >> in the same spatial ref sys as the shapefile's. Running the WKT of the >> shapefile's SRS through ogr.osr.SpatialReference's ExportToProj4(): >> >> '+proj=lcc +lat_1=38.3 +lat_2=39.45 +lat_0=37.66666666666666 >> +lon_0=-77 +x_0=399999.9999999999 +y_0=0 +ellps=GRS80 +datum=NAD83 >> +to_meter=0.3048006096012192 +no_defs ' >> >> Cheers, >> Paul. >> >> -- >> Paul Smith >> http://www.pauladamsmith.com/ >> _______________________________________________ >> Mapnik-users mailing list >> [email protected] >> https://lists.berlios.de/mailman/listinfo/mapnik-users > > -- "News is what people want to keep hidden, and everything else is publicity" --Bill Moyers _______________________________________________ Mapnik-users mailing list [email protected] https://lists.berlios.de/mailman/listinfo/mapnik-users
