Standard
String Descriptor Notes
E000 Clarke 1866 NAD1927
E001 Clarke 1880
E002 Bessel 1841
E003 New International 1967
E004 International 1924 Also known as "Hayford 1909"
E005 WGS 1972
E006 Everest 1830
E007 WGS 1966
E008 GRS 1980 NAD1983
E009 Airy 1830
E010 Everest 1948 W. Malaysia and Singapore
E011 Modified Airy
E012 WGS 1984 GPS
E013 Modified Fisher 1960 Also known as "Southeast Asia"
E014 Australian National 1965
E015 Krassovsky 1940
E016 Hough 1960
E017 Fisher 1960 Also known as "Mercury 1960"
E018 Fisher 1968 Also known as "Modified Mercury 1968"
E019 Normal Sphere
E200 Indonesian 1974 Indonesia
E201 Everest Pakistan
E333 Bessel 1841 Japan
E900 Bessel 1841 Namibia
E901 Everest 1956 India
E902 Everest 1969 W. Malaysia
E903 Everest E. Malaysia and Brunei
E904 Helmert 1906
E905 SGS 1985
E906 WGS 1960
E907 South American 1969
E910 ATS77
E999 Unsupported earth model, where the earth model fields
are defined in an existing georeference segment.
Semi-Major Semi-Minor
Axis (A) Axis (B)
ELLIPS Descriptor (metres) (metres)
0 Clarke 1866 6378206.400000 6356583.800000
1 Clarke 1880 6378249.145000 6356514.869550
2 Bessel 1841 6377397.155000 6356078.962840
3 New International 1967 6378157.500000 6356772.200000
4 International 1924 6378388.000000 6356911.946130
5 WGS 1972 6378135.000000 6356750.519915
6 Everest 1830 6377276.345200 6356075.413300
7 WGS 1966 6378145.000000 6356759.769356
8 GRS 1980 6378137.000000 6356752.314140
9 Airy 1830 6377563.396000 6356256.910000
10 Everest 1948 6377304.063000 6356103.039000
11 Modified Airy 6377340.189000 6356034.448000
12 WGS 1984 6378137.000000 6356752.314245
13 Modified Fisher 1960 6378155.000000 6356773.320500
14 Australian Nat 1965 6378160.000000 6356774.719000
15 Krassovsky 1940 6378245.000000 6356863.018800
16 Hough 1960 6378270.000000 6356794.343479
17 Fisher 1960 6378166.000000 6356784.283666
18 Fisher 1968 6378150.000000 6356768.337303
19 Normal Sphere 6370997.000000 6370997.000000
200 Indonesian 1974 6378160.000000 6356774.504086
201 Everest (Pakistan) 6377309.613000 6356108.570542
333 Bessel 1841 (Japan) 6377397.155000 6356078.963000
900 Bessel 1841 (Namibia) 6377483.865000 6356165.382966
901 Everest 1956 6377301.243000 6356100.228368
902 Everest 1969 6377295.664000 6356094.667915
903 Everest 6377298.556000 6356097.550301
904 Helmert 1906 6378200.000000 6356818.169628
905 SGS 85 6378136.000000 6356751.301569
906 WGS 60 6378165.000000 6356783.286959
907 South American 1969 6378160.000000 6356774.719000
910 ATS77 6378135.000000 6356750.304922
There is software available to the public for conversion
of NAD1927 coordinates to NAD1983 coordinates. For Canadian users,
you can contact the following for the National Transformation
package (Version 1.1):
Geodetic Survey Division, 615 Booth Street, Ottawa, Ontario K1A 0E9 Tel: (613) 992-2706, (613) 995-2613 Fax: (613) 995-3215The National Transformation package is also available through the Provincial Survey Agencies.
For American users, you can contact the following for the NADCON package:
National Geodetic Information Center, N/CG174, Rockwall Bldg., Room 24, National Geodetic Survey, NOAA, Rockville, Maryland 20852 Tel: (301) 443-8631 Fax: (301) 881-0154