<div dir="ltr">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.  <div><br></div><div>The GTF file includes the following:<br><div><br></div><div>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]]<br clear="all"><div><br></div><div>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.  </div><div><br></div><div><div>"C:\Program Files (x86)\HEC\HEC-RAS\5.0\GDAL\data\datum_shift.csv"</div><div>"C:\Program Files (x86)\HEC\HEC-RAS\5.0\GDAL\data\ellipsoid.csv"</div><div>"C:\Program Files (x86)\HEC\HEC-RAS\5.0\GDAL\data\gcs.csv"</div><div>"C:\Program Files (x86)\HEC\HEC-RAS\5.0\GDAL\data\gcs.override.csv"</div><div>"C:\Program Files (x86)\HEC\HEC-RAS\5.0\GDAL\data\gdal_datum.csv"</div><div>"C:\Program Files (x86)\HEC\HEC-RAS\5.0\GDAL\data\geoccs.csv"</div><div>"C:\Program Files (x86)\HEC\HEC-RAS\5.0\GDAL\data\gt_datum.csv"</div><div>"C:\Program Files (x86)\HEC\HEC-RAS\5.0\GDAL\data\gt_ellips.csv"</div></div><div><br></div><div>Any tips are appreciated.</div><div><br></div>-- <br><div class="gmail_signature">Derek</div>
</div></div></div>