[gdal-dev] GetGeoTransform returning different values

[Javier Jimenez Shaw]

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 at 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"]]_______________________________________________
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