[gdal-dev] GDAL (.NET) coordinate transformation via BETA2007

[Carsten Lockenkötter]

Hi Even,

with GDAL 2.4.2 on a CMD (gdaltransform) it works fine, too.
But not in my application, which is used the GDAL.Native NuGet package.

If it helps, I can write you a small test program.

Or is there another (better) way to transform geometries in SQLServer?

-----Ursprüngliche Nachricht-----
Von: Even Rouault <even.rouault at spatialys.com> 
Gesendet: Dienstag, 27. August 2019 17:31
An: gdal-dev at lists.osgeo.org
Cc: Carsten Lockenkötter <carsten.lockenkoetter at gon.de>
Betreff: Re: [gdal-dev] GDAL (.NET) coordinate transformation via BETA2007

> What i need:
> Beta2007 Transformation via EPSG code, but i don't know, where i have 
> to change it.
 (optional) if i can't change the transformation via EPSG code
> via Gridfile, i need to know the correct proj4 string for my 
> transformation.

Works on the box with GDAL 3 + PROJ 6

$ echo "3000000 5500000" | gdaltransform -s_srs EPSG:31466 -t_srs EPSG:3857 -- debug on
OGRCT: Selecting transformation +proj=pipeline +step +proj=axisswap +order=2,1 
+step +inv +proj=tmerc +lat_0=0 +lon_0=6 +k=1 +x_0=2500000 +y_0=0 
+ellps=bessel +step +proj=hgridshift +grids=BETA2007.gsb +step 
++proj=webmerc
+lat_0=0 +lon_0=0 +x_0=0 +y_0=0 +ellps=WGS84 (Inverse of 3-degree 
+Gauss-Kruger
zone 2 + DHDN to WGS 84 (4) + Popular Visualisation Pseudo-Mercator)
1435447.09516912 6348270.59693845 0

Even

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