This document provides details about the Arc 1950 datum including its name, code, ellipsoid, prime meridian, scope, realization epoch, area of use, and source. The Arc 1950 datum uses the Clarke 1880 ellipsoid with a semi-major axis of 6378249.145 meters and inverse flattening of 293.4663077 meters. It has been used for topographic mapping and geodetic surveys in Botswana, Malawi, Zambia, and Zimbabwe since 1950.

1. DATUM REPORT
ARC 1950
DATUM DETAILS
DATUM NAME
Arc 1950
DATUM CODE
6209
ELLIPSOID
[ 7013 ] Clarke 1880 (Arc)
PRIME MERIDIAN
[ 8901 ] Greenwich
SCOPE
Topographic mapping, geodetic survey.
REALIZATION EPOCH
1950
AREA OF USE
[ 1276 ] Africa - Botswana, Malawi, Zambia, Zimbabwe
-8.19 °
20 °
35.92 °
-26.88 °
Used in: Botswana; Malawi; Zambia; Zimbabwe.
DATA SOURCE
OGP
REVISION DATE
06/24/2008
ELLIPSOID DETAILS
ELLIPSOID NAME
Clarke 1880 (Arc)
ELLIPSOID CODE
7013
DIMENSIONS
Semi Major Axis
6378249.145 metre
Inverse Flattening 293.4663077 metre
Shape
Ellipsoid
REMARKS
Adopts Clarke's value for a with derived 1/f. Uses his 1865 ratio of 39.370432 inch per metre
to convert semi-major axis to metres.
INFORMATION SOURCE
Chief Directorate: Surveys and Mapping, Mowbray, South Africa.
DATA SOURCE
OGP
REVISION DATE
06/05/2001
PRIME MERIDIAN DETAILS

2. NAME
Greenwich
CODE
8901
GREENWICH LONGITUDE
0 degree
DATA SOURCE
OGP
REVISION DATE
06/02/1995