[Proj] problem in projection
Noel Zinn
ndzinn at comcast.net
Tue Feb 24 12:25:12 EST 2009
EPSG Projected CRS code 3106 comes very close. It's Bangladesh Transverse
Mercator on the Gulshan 303 datum using Everest 1830 (1937 adjustment). The
only projection parameter that differs is the False Northing, 0 in the case
of 3106 and -2M in your case (curious). But this will be a static offset.
I don't see a better candidate in the current dataset (6.18) that you can
download yourself at www.epsg.org. The (rather garbled text) below is
extracted from the dataset for 3106.
I have no idea whether this information will be useful to you in Proj4.
Noel
International Association of
Detailed Report on Projected
Coordinate Reference Systems
Oil and Gas Producers
data set version 6.18.2
Search Criteria: *bangladesh*
# 1 Cod 3106 Name: Gulshan 303 / Bangladesh Transverse
Mercator
EPSG abbreviation: Gulshan / Bangladesh TM
Base GeogCRS: Gulshan 303
CS
axes:
Geodetic Datum: Gulshan 303
Orde Axis Name Abbr Axis Units
Orientation
1 Easting E metre
east
2 Northing N metre
north
CS Used in projected and engineering coordinate reference systems.
Semi-major axis 6377276.345 metre
remarks:
(a) =
Map Bangladesh Transverse Mercator
Inverse flattening 300.8017
Projection:
(1/f) =
Projection Transverse Mercator
Prime Meridian: Greenwich
Parameter Name Parameter Value Unit of
Datum origin: Gulshan garden, Dhaka.
Measure
Latitude of natural origin 0° 0' 0 N
observed and adjusted in 1995 by Japan
Longitude of natural origin 90° 0' 0 E
International Cooperation Agency (JICA).
Scale factor at natural origin 0.9996 unity
500000 metre
CRS scope: Large and medium scale topographic mapping
False easting
and engineering survey.
False northing 0 metre
CRS remarks:
Projection
remarks:
CRS info. source: Survey of Bangladesh via IGN Paris and Tullow
Data OGP Revision 22-Jun-06 Change 2006.470
Oil.
source: date: id:
CRS area of use: Bangladesh - onshore and offshore.
-----Original Message-----
From: proj-bounces at lists.maptools.org
[mailto:proj-bounces at lists.maptools.org] On Behalf Of Milo van der Linden
Sent: Tuesday, February 24, 2009 9:54 AM
To: PROJ.4 and general Projections Discussions
Subject: Re: [Proj] problem in projection
BTM will probably be: Bangladesh transverse mercator
Zahid Parvez wrote:
> hi
>
> I have a shape file which I have to import in GRASS. Shape file is
> consists of a shape file, a dbf file and a prj file.
> The prj file has following information.
>
> PROJCS["BTM",
> GEOGCS["GCS_Everest_1830",
> DATUM["D_Everest_1830",
> SPHEROID["Everest_1830",6377299.36,300.8017]],
> 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]]
>
>
> I will be very grateful if anyone could help me to find the ESPG code .
>
>
> Best
> Md. Zahid Parvez
>
> ------------------------------------------------------------------------
>
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