The Chatham Islands Transverse Mercator 1979 (CITM1979) is the CIGD1979 projection that has been used for 1:50,000 topographic mapping in the Chatham Islands (the latest editions were published in 1998 with limited revisions).
The key parameters of CITM1979 are summarised below:
|Name:||Chatham Island Transverse Mercator 1979|
|Projection type:||Transverse Mercator|
|Reference ellipsoid:||International 1924|
|Origin latitude:||44° 00' 00" South|
|Origin longitude / central meridan:||176° 30' 00" West|
|False Northing:||650,000 metres North|
|False Easting:||350,000 metres East|
|Central meridian scale factor:||1.0000|
The CITM1979 has now been superseded by the Chatham Islands Transverse Mercator 2000 (CITM2000) projection. Information about converting coordinates between the CITM1979 and CITM2000 projections is available on the coordinate conversion pages.