[gdal-dev] Setting up GDAL Custom Transformation from ESRI GTF File

[Andre Joost]

Am 31.03.2016 um 17:16 schrieb Derek Stuart:
> I am using GDAL routines as part of RAS Mapper within HEC-RAS.   I
> am coming from ArcMap where I am using a custom transformation GTF
> file to translate from the D_Everest_Bangladesh datum to WGS_1984.
>
> The GTF file includes the following:
>
> GEOGTRAN["ever2wgs",GEOGCS["GCS_Everest_Bangladesh",DATUM["D_Everest_Bangladesh",SPHEROID["Everest_Adjustment_1937",6377276.345,300.8017]],PRIMEM["Greenwich",0.0],UNIT["Degree",0.0174532925199433]],GEOGCS["GCS_WGS_1984",DATUM["D_WGS_1984",SPHEROID["WGS_1984",6378137.0,298.257223563]],PRIMEM["Greenwich",0.0],UNIT["Degree",0.0174532925199433]],METHOD["Geocentric_Translation"],PARAMETER["X_Axis_Translation",283.729],PARAMETER["Y_Axis_Translation",735.942],PARAMETER["Z_Axis_Translation",261.143]]
>

The parameters seem to be identical with EPSG:4682 Gulshan 303:

+proj=longlat +a=6377276.345 +b=6356075.41314024 
+towgs84=283.7,735.9,261.1,0,0,0,0 +no_defs

So just assign that CRS and see if the data fits to other data sources, 
like Openstreetmap.

HTH,
André Joost