Bangladesh Transverse Mercator (BTM), Projections

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A projected coordinate system has a flat, 2D surface with constant lengths, angles, and areas across the two dimensions. Which makes it easier to calculate properties like the area, and distance of an object in a map. UTM (Universal Transverse Mercator) is a widely used projected coordinate system that divides the Earth into sixty zones, each in a six-degree interval.

As Bangladesh lies between UTM Zone 45N and 46N, FAP19 has adopted a Transverse Mercator projection for Bangladesh. PaThe parametersf this projection are:

SL. No

NAME

BANGLADESH TRANSVERSE MERCATOR (BTM)

1

Projection

Transverse Mercator

2

False Easting

500000

3

False Northing

-2000000

4

Central Meridian

90

5

Scale Factor

0.9996

6

Latitude Of Origin

0

7

Linear Unit

Meter (1.0)

8

Linear Unit

Meter (1.0)

9

Geographic Coordinate System

GCS_Everest_1830

10

Angular Unit

Degree (0.0174532925199433)

11

Prime Meridian

Greenwich (0.0)
 
Parameters of Geocentric_Transformation

Please note that it's necessary to apply the datum transformation parameter in order to convert from any coordinate system that uses the Everest 1830 datum to a coordinate system that uses WGS 1984 datum, required datum transformation parameters –
Also, note that these parameter values will be negative when transforming from WGS 1984 to Everest 1830.
For example, roads shown in this image which is in WGS 1984 datum show displacement in on-the-fly projection before applying datum transformation parameters
To apply transformation parameters, it is required to create a custom transformation with the Create Custom Geographic Transformation tool. Then it could be used with on-the-fly projection/Project tool. 

Attachments:

  • Projection File(.prj): Bangladesh Transverse Mercator (BTM)
  • Source: FAP 19: Bangladesh Transverse Mercator
  • E-mail me for the compressed BTM File.

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