This Article going to cover detail information on BTM and BUTM map projection parameter for Bangladesh. Why BTM and BUTM map projection are considered. Datum transformation parameter to convert from Everest 1830 datum to the coordinate system which use WGS 1984 as datum.
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| BTM and BUTM Map Projection Parameters For Bangladesh |
What is Map Projection :
You can say Map Projection is the method of representing the entire or a portion of the spherical Earth on a flat surface. Which makes the properties like Area, Shape, Distance and Direction of a object in map easier calculate. This is impossible to achieve without some distortion. The mapmaker must choose the one that is most suited to the situation as there is no such thing as a "best" projection. Minimizing distortion of the map is most crucial in all Map Projection.
Learn More About Different Projection Widely
Reason For Selecting Local Projection System like BTM and BUTM
Universal Transverse Mercator (UTM) is a widely used projected coordinate system which divides the Earth into 60 zones, each in 6 degree interval.
Bangladesh is located in Zone 45 N and Zone 46 N of the UTM. The parameter values that define a UTM zone, however, vary between zones. Therefore, when someone attempts to map whole Bangladesh Map or the portion of Bangladesh that is located inside both UTM zones for example ( Zone 45 N and Zone 46 N ), an issue with projection accuracy develops.
A new projection system, the BTM projection system, was developed from the UTM to address this issue in the Flood Action Plan 19 (FAP 19) study.
BTM Map Projection Parameter For Bangladesh
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Projection Name: BTM |
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Authority: Custom |
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Projection: |
Transverse_Mercator |
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False_Easting: |
500000.0 |
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False_Northing: |
-2000000.0 |
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Central_Meridian: |
90.0 |
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Scale_Factor: |
0.9996 |
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Latitude_Of_Origin: |
0.0 |
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Linear Unit: |
Meter (1.0) |
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Geographic Coordinate System: |
GCS_Everest_Bangladesh |
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Angular Unit: |
Degree (0.0174532925199433) |
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Prime Meridian: |
Greenwich (0.0) |
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Datum: |
D_Everest_Bangladesh |
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Spheroid: |
Everest_Adjustment_1937 |
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Semimajor Axis: |
6377276.345 |
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Semiminor Axis: |
6356075.41314024 |
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Inverse Flattening: |
300.8017 |
BUTM Map Projection Parameter For Bangladesh
BUTM Projection is now widely used in Bangladesh as it contain datum: D_WGS_1984which is similar to The World Geodetic System 1984 (WGS84) DATUM ["WGS_1984"] which is a global datum, where coordinates for any things that are fixed in the ground change with time. It is consistent with the International Terrestrial Reference Frame to roughly 1 cm.
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Projection: |
Transverse_Mercator |
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False_Easting: |
500000 |
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False_Northing: |
0.0 |
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Central_Meridian: |
90.0 |
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Scale_Factor: |
0.9996 |
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Latitude_Of_Origin: |
0.0 |
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Linear Unit: |
Meter (1.0) |
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Geographic Coordinate System: |
GCS_WGS_1984 |
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Angular Unit: |
Degree (0.0174532925199433) |
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Prime Meridian: |
Greenwich (0.0) |
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Datum: |
D_WGS_1984 |
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Spheroid: |
WGS_1984 |
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Semimajor Axis: |
6378137.0 |
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Semiminor Axis: |
6356752.31424517 |
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Inverse Flattening: |
298.257223563 |
Convert Datum from Everest 1830 to WGS 1984 (BTM to BUTM Map Projection System):
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Methods |
Geocentric Translation |
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ΔX |
283.729m |
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ΔY |
735.942m |
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ΔZ |
261.143m |
In order to Convert from BUTM to BTM Map Projection System (Datum from WGS 1984 to Everest 1830 ), required transformation parameters are:
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Methods |
Geocentric Translation |
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ΔX |
-283.729m |
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ΔY |
-735.942m |
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ΔZ |
-261.143m |
Find Different Projection System Parameter Here: epsg.io
Learn ArcGIS software from Beginning to Advance level here : Link
Lambert Conformal Conic (LCC) Projection Parameter For Bangladesh
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Projection : |
Lambert Conformal Conic (LCC) |
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False Easting : |
2743185.699 (m) |
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False Northing : |
914395.233 (m) |
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Central Meridian : |
90 00 00 (dd mm ss) |
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1st standard parallel : |
23 09 00 (dd mm ss) |
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2nd standard parallel : |
28 48 00 (dd mm ss) |
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Latitude of Origin : |
26 00 00 (dd mm ss) |
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Linear Unit : |
Meter (1.000000) |
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Geographic Coordinate System : |
Everest Bangladesh |
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Angular Unit : |
Degree (0.017453292519943299) |
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Prime Meridian : |
Greenwich (0.000000000000000000) |
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Datum : |
Everest Bangladesh |
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Spheroid : |
Everest Bangladesh 1937 |
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Semi major Axis : |
6377276.34499999 |
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Semi minor Axis : |
6356075.41314024000 |
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Inverse Flattening : |
300.801699999999 |