The first is in WKT2, while the second is in WKT1. On Fri, 5 Sept 2025, 19:48 Cory Foy via gdal-dev, <gdal-dev@lists.osgeo.org> wrote:
> Hi All, > > Sorry for the bother again - I noticed that when I use gdalinfo to query a > document (in this case, a GeoPDF) the geotransform coordinates are slightly > different than when I can GetGeoTransform using the API on the same > document with GDALOpen + GDALGetGeoTransform. But I also noticed the WKS > seems to be different in the two as well. Is there a configuration or > something else I might be missing that would cause these to be off? > > Cory > > Gdalinfo: > > PROJCRS["Popular Visualisation CRS / Mercator", > BASEGEOGCRS["WGS 84", > DATUM["World Geodetic System 1984", > ELLIPSOID["WGS 84",6378137,298.257223563, > LENGTHUNIT["metre",1]]], > PRIMEM["Greenwich",0, > ANGLEUNIT["degree",0.0174532925199433]], > ID["EPSG",4326]], > CONVERSION["unnamed", > METHOD["Popular Visualisation Pseudo Mercator", > ID["EPSG",1024]], > PARAMETER["Latitude of natural origin",0, > ANGLEUNIT["degree",0.0174532925199433], > ID["EPSG",8801]], > PARAMETER["Longitude of natural origin",0, > ANGLEUNIT["degree",0.0174532925199433], > ID["EPSG",8802]], > PARAMETER["False easting",0, > LENGTHUNIT["metre",1], > ID["EPSG",8806]], > PARAMETER["False northing",0, > LENGTHUNIT["metre",1], > ID["EPSG",8807]]], > CS[Cartesian,2], > AXIS["(E)",east, > ORDER[1], > LENGTHUNIT["metre",1, > ID["EPSG",9001]]], > AXIS["(N)",north, > ORDER[2], > LENGTHUNIT["metre",1, > ID["EPSG",9001]]]] > > > API: > > PROJCS["Popular Visualisation CRS / Mercator",GEOGCS["WGS > 84",DATUM["WGS_1984",SPHEROID["WGS > 84",6378137,298.257223563,AUTHORITY["EPSG","7030"]],TOWGS84[0,0,0,0,0,0,0],AUTHORITY["EPSG","6326"]],PRIMEM["Greenwich",0,AUTHORITY["EPSG","8901"]],UNIT["degree",0.0174532925199433,AUTHORITY["EPSG","9122"]],AXIS["Latitude",NORTH],AXIS["Longitude",EAST],AUTHORITY["EPSG","4326"]],PROJECTION["Mercator_1SP"],PARAMETER["central_meridian",0],PARAMETER["scale_factor",1],PARAMETER["false_easting",0],PARAMETER["false_northing",0],UNIT["metre",1,AUTHORITY["EPSG","9001"]],AXIS["Easting",EAST],AXIS["Northing",NORTH],EXTENSION["PROJ4","+proj=merc > +a=6378137 +b=6378137 +lat_ts=0 +lon_0=0 +x_0=0 +y_0=0 +k=1 +units=m > +nadgrids=@null +wktext > +no_defs"]]_______________________________________________ > gdal-dev mailing list > gdal-dev@lists.osgeo.org > https://lists.osgeo.org/mailman/listinfo/gdal-dev >
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