Reference Ellipsoid Parameters

Reference Ellipsoid

ID
Code

Semi-Major
Axis a

Semi-Minor
Axis b

Flattening
f

Airy (1930)

AA

6377563.396

6356256.9090

1/299.3249646

Australian National

AN

6378160

6356774.7190

1/298.25

Bessel 1841

 

 

 

 

Ethiopia, Indonesia, Japan, Korea

BR

6377397.155

6356078.9630

1/299.1528128

Namibia

BN

6377483.865

6356165.383

1/299.1528128

Clarke 1866

CC

6378206.4

6356583.800

1/294.9786982

Clarke 1880

CD

6378249.145

6356514.870

1/293.465

Everest

 

 

 

 

Brunei & E. Malasia (Sabah & Sarawak)

EB

6377298.556

6356097.550

1/300.8017

India 1830

EA

6377276.345

6356075.413

1/300.8017

India 1956*

EC

6377301.243

6356100.228

1/300.8017

Pakistan*

EF

6377309.613

6356109.571

1/300.8017

W. Malasia and Singapore 1948

EE

6377304.063

6356103.039

1/300.8017

W. Malasia 1969*

ED

6377295.664

6356094.668

1/300.8017

Geodetic Reference System 1980 (GRS 80)

RF

6378137

6356752.3141

1/298.257222101

Helmert 1906

HE

6378200

6356818.170

1/298.3

Hough 1960

HO

6378270

6356794.343

1/297

Indonesian 1974

ID

6378160

6356774.504

1/298.247

International 1924

IN

6378388

6356911.946

1/297

Krassovsky 1940

KA

6378245

6356863.019

1/298.3

Modified Airy

AM

6377340.189

6356034.4480

1/299.3249646

Modified Fischer 1960 (South Asia)

FA

6378155

6356773.320

1/298.3

South American 1969

SA

6378160

6356774.719

1/298.25

World Geodetic System 1972 (WGS 72)

WD

6378135

6356750.520

1/298.26

World Geodetic System 1984 (WGS 84)

WE

6378137

6356752.3142

1/298.257223563

NOTE: All measurements are in meters.

* Through adoption of a new yard to meter conversion factor in the referenced country.