Introduction:
Projection Information
Data generation for GIS work in Bangladesh is very difficult because there is a different
sets of projection parameters and datum. For the old maps the projections parameters
are not well documented which is very inconvenient to work with maps of different
times. Because of this inconvenience it is also not possible to use the GIS data from
different sources.
For the current project “3-Dimensional urban Geological modeling” the following
settings has been done for projection. Refference of this settings is Topo map of Survey
of Bangladesh (SOB) 2003, scale is 1:5000 scale of greater Dhaka city and
surroundings based on aerial photos of Jan 2003 and printed at 2004.
Coordinate System Name on Map
Bangladesh Universal Transverse Marcetor
(BUTM)
DATUM Name:
Gulshan
Ellipsoid Name
Everest 1830
Semi-major axis (a)
6377276.345 m
Semi-minor axis (b)
6356075.413
Flattening 1/f
1/3008017
SHIFT to WGS84
Molodensky
Dx
+283.7m
Dy
+735.9m
Dz
+261.1m
Da
+860.7
Df
+0.28361368
Vertical Datum
Gulshan Datum (newly built)
PROJECTION
Transvers Mercator
Central Meridian
90° E
Latitude of origin
0°(equator)
Scale factor
0.9996
False Easting
500000m
False Northing
0
Information Source
Survey of Bangladesh, Nov. 2005,
Parameter of the Gulshan Datum
GPS no. 303
Ellipsoid WGS84
Everest 1830 unprojected
projected in BUTM
23
°
47
′
52.02714
″Ν
23
°
47
′49.48503″Ν
N 2631605.718m
90
°
24
′
56.34024
″Ε
90
°
25
′06.55272″Ε
E 542625.533m
Ellipsoid Height=-45.45m
Orthometric
Height=8.5344m
Bench mark No. 539 and
Height is 6.4292m
In Bangladesh there is different ellipsoid has been used. A list of different sets of
projections parameter has given in the index.
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Ellipsoid Inforemation
Ellipsoid
Semi major axis
m
Semi minor
axis
Inverse
flattening 1/f
Datum shift parameter, m
Remarks
Ax
Ay
Az
Source
Everest 1830
6,377,276.345
6,356,075.413
300.801700000
289
734
257
Mauelan User Guid
Most
Text
Book
283.729
735.942
261.143
JICA Study
282
726
254
Molondensky Constants
Everest Bangladesh
6,377,298.524
6,356,097.518
300.8017
288
735
256
FAP 24
Everest 1948 (or Malaya RTK)
6,377,304.063
6,356,103.039
300.8017
WGS 84
6,378,137.000
6,356,752.314
Projection Information
Projection Name
Spheroid
Central Meridian
Latitude of
Origin
False
Northing
False Easting
Scale Factor
User
Remarks
TM (Transverse
Mercator)
Everest 1830
90
°
E of Greenwich
0
°
of
Equator
0 m
50000 m
0.9998
SPOT XS
satellite, FAP6
UTM (Universal
Transverse
Mercator)
Depends on
the set up
87
°
E(for zone 45,
between 84E-90E)
93
°
E(for zone 46,
between 90E-96E)
0
°
of
Equator
0 m
50000 m
0.9996
GPS
BUTM (Bangladesh
Universal
Transverse
Mercator)
Everest
Bangladesh
or 1830
90
°
E of Greenwich
0
°
of
Equator

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- Spring '10
- Hani
- Cartography, Geodesy, Map projection, Geographic coordinate system
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