Chatham Islands Geodetic Datum 1971 (CIGD1971)

Chatham Islands Geodetic Datum 1971 (CIGD1971) was previously used to define positions on the Chatham Islands. It was replaced in 1981 by Chatham Islands Geodetic Datum 1979 (CIGD1979), and both were superseded by New Zealand Geodetic Datum 2000 (NZGD2000) from March 1998.

Chatham Islands Geodetic Datum 1971 (CIGD1971) was the official geodetic datum used in the Chatham Islands from 1971. In 1981 the Chatham Islands Geodetic Datum 1979 (CIGD1979) superseded CIGD1971.

A geodetic datum is a reference system that defines how positions are represented. This includes:

Key parameters from the Chatham Islands Geodetic Datum 1971.
NameChatham Islands Geodetic Datum 1971
AbbreviationNZGD1941
Coverage areaThe Chatham Island group between 177.54°W – 177.25°W and 43.3°S – 44.64°S
EPSG code6672
Coordinate systemGeographic
Reference frameAstronomic datum
Reference ellipsoidInternational 1924
Prime meridianGreenwich
Deformation modelN/A
Reference dateN/A