<div dir="ltr">Andre:<div>The only Gulshan coordinate system I see with EPSG 4682 is a geographic coordinate system.  I am using a projected coordinate system called BTM.  This is a fairly new coordinate system, but it is the standard here in Bangladesh.  <br></div><div><br></div><div><div>PROJCS["BTM",GEOGCS["GCS_Everest_Bangladesh",DATUM["D_Everest_Bangladesh",SPHEROID["Everest_Adjustment_1937",6377276.345,300.8017]],PRIMEM["Greenwich",0.0],UNIT["Degree",0.0174532925199433]],PROJECTION["Transverse_Mercator"],PARAMETER["False_Easting",500000.0],PARAMETER["False_Northing",-2000000.0],PARAMETER["Central_Meridian",90.0],PARAMETER["Scale_Factor",0.9996],PARAMETER["Latitude_Of_Origin",0.0],UNIT["Meter",1.0]]<br></div></div><div><br></div><div>There is a projected coordinate system called Gulshan 303 Bangladesh TM that uses the Gulshan datum, but it has EPSG 3106, not 4682. </div><div><br></div><div>PROJCS["Gulshan_303_Bangladesh_TM",GEOGCS["GCS_Gulshan_303",DATUM["D_Gulshan_303",SPHEROID["Everest_Adjustment_1937",6377276.345,300.8017]],PRIMEM["Greenwich",0.0],UNIT["Degree",0.0174532925199433]],PROJECTION["Transverse_Mercator"],PARAMETER["False_Easting",500000.0],PARAMETER["False_Northing",0.0],PARAMETER["Central_Meridian",90.0],PARAMETER["Scale_Factor",0.9996],PARAMETER["Latitude_Of_Origin",0.0],UNIT["Meter",1.0],AUTHORITY["EPSG",3106]]<br></div><div><br></div><div>This has very similar parameters to BTM, except that Gulshan 303 has a false northing of 0 and BTM has -2000000.0.  I asked some other GIS professionals locally and was told that here isn't a EPSG code that matches BTM.  Unless I want to reproject my data and work in UTM, I don't see a way to avoid adding a custom transformation to GDAL.  </div><div><br></div><div>Derek</div><div><br></div><div><br></div><div><br></div><div><br></div></div><div class="gmail_extra"><br><div class="gmail_quote">On Fri, Apr 1, 2016 at 12:18 PM, Andre Joost <span dir="ltr"><<a href="mailto:andre+joost@nurfuerspam.de" target="_blank">andre+joost@nurfuerspam.de</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><span class="">Am 31.03.2016 um 17:16 schrieb Derek Stuart:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
I am using GDAL routines as part of RAS Mapper within HEC-RAS.   I<br>
am coming from ArcMap where I am using a custom transformation GTF<br>
file to translate from the D_Everest_Bangladesh datum to WGS_1984.<br>
<br>
The GTF file includes the following:<br>
<br>
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>
<br>
</blockquote>
<br></span>
The parameters seem to be identical with EPSG:4682 Gulshan 303:<br>
<br>
+proj=longlat +a=6377276.345 +b=6356075.41314024 +towgs84=283.7,735.9,261.1,0,0,0,0 +no_defs<br>
<br>
So just assign that CRS and see if the data fits to other data sources, like Openstreetmap.<br>
<br>
HTH,<br>
André Joost<br>
<br>
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<a href="http://lists.osgeo.org/mailman/listinfo/gdal-dev" rel="noreferrer" target="_blank">http://lists.osgeo.org/mailman/listinfo/gdal-dev</a></blockquote></div><br><br clear="all"><div><br></div>-- <br><div class="gmail_signature">Derek</div>
</div>