AIRY
ATS77
AUSTRALIAN
BESSEL
CLARKE1866
CLARKE1880
EVEREST
FISCHER1960
FISCHER1968
GRS80
HELMERT1906
HOUGH
INT1909
INT1967
KRASOVSKY
MERCURY1960
MERCURY1968
MODAIRY
MODEVEREST
MODIFIEDFISCHER1960
NAD27
NAD83
SEASIA
SOUTHAMERICAN1969
SPHERE
WALBECK
WGS66
WGS72
WGS84