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]] I can't seem to figure out how to set this up for GDAL. I suspect that I need to add this to one of the following files. "C:\Program Files (x86)\HEC\HEC-RAS\5.0\GDAL\data\datum_shift.csv" "C:\Program Files (x86)\HEC\HEC-RAS\5.0\GDAL\data\ellipsoid.csv" "C:\Program Files (x86)\HEC\HEC-RAS\5.0\GDAL\data\gcs.csv" "C:\Program Files (x86)\HEC\HEC-RAS\5.0\GDAL\data\gcs.override.csv" "C:\Program Files (x86)\HEC\HEC-RAS\5.0\GDAL\data\gdal_datum.csv" "C:\Program Files (x86)\HEC\HEC-RAS\5.0\GDAL\data\geoccs.csv" "C:\Program Files (x86)\HEC\HEC-RAS\5.0\GDAL\data\gt_datum.csv" "C:\Program Files (x86)\HEC\HEC-RAS\5.0\GDAL\data\gt_ellips.csv" Any tips are appreciated. -- Derek
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