Map Projections > Ellipsoids > Predefined Ellipsoids
 
Predefined Ellipsoids
The maps package contains a list of predefined ellipsoids. A predefined ellipsoid is referenced by its name. To access a predefined ellipsoid, use the static method GetRegisteredEllipsoid of the class IlvEllipsoid.
For example:
const IlvEllipsoid* ellipsoid =
IlvEllipsoid::GetRegisteredEllipsoid("clrk66");
IlvProjection* projection = new IlvMercatorProjection();
projection->setEllipsoid(*ellipsoid);
The following table provides a list of the predefined ellipsoids that are available.
Name
Comment
Semi-Major Axis
Eccentricity
sphere
Sphere of 6370997 m
6370997.0
0.0
MERIT
MERIT 1983
6378137.0
0.0818192
SGS85
Soviet Geodetic System 85
6378136.0
0.0818192
GRS80
GRS 1980(IUGG, 1980)
6378137.0
0.0818192
IAU76
IAU 1976
6378140.0
0.0818192
airy
Airy 1830
6377563.396
0.0816734
APL4.9
Appl. Physics. 1965
6378137.0
0.0818202
NWL9D
Naval Weapons Lab., 1965
6378145.0
0.0818202
mod_airy
Modified Airy
6377340.189
0.0816734
andrae
Andrae 1876 (Den., Iclnd.)
6377104.43
0.0815816
aust_SA
Australian Natl & S. Amer. 1969
6378160.0
0.0818202
GRS67
GRS 67(IUGG 1967)
6378160.0
0.0818206
bessel
Bessel 1841
6377397.155
0.0816968
bess_nam
Bessel 1841 (Namibia)
6377483.865
0.0816968
clrk66
Clarke 1866
6378206.4
0.0822719
clrk80
Clarke 1880 mod.
6378249.145
0.0824832
CPM
Commission des Poids et Mesures (1799)
6375738.7
0.0772909
delmbr
Delambre 1810 (Belgium)
6376428.0
0.080064
engelis
Engelis 1985
6378136.05
0.0818193
evrst30
Everest 1830
6377276.345
0.081473
evrst48
Everest 1948
6377304.063
0.081473
evrst56
Everest 1956
6377301.243
0.081473
evrst69
Everest 1969
6377295.664
0.081473
evrstSS
Everest (Sabah & Sarawak)
6377298.556
0.081473
fschr60
Fischer (Mercury Datum) 1960
6378166.0
0.0818133
fschr60m
Modified Fischer 1960
6378155.0
0.0818133
fschr68
Fischer 1968
6378150.0
0.0818133
helmert
Helmert 1906
6378200.0
0.0818133
hough
Hough
6378270.0
0.0819919
intl
International 1909 (Hayford)
6378388.0
0.0819919
krass
Krassovsky, 1942
6378245.0
0.0818133
kaula
Kaula 1961
6378163.0
0.0818215
lerch
Lerch 1979
6378139.0
0.0818192
mprts
Maupertius 1738
6397300.0
0.1021949
new_intl
New International 1967
6378157.5
0.0818202
plessis
Plessis 1817 (France)
6376523.0
0.0804333
SEasia
Southeast Asia
6378155.0
0.0818133
walbeck
Walbeck
6376896.0
0.0812068
WGS60
WGS 60
6378165.0
0.0818133
WGS66
WGS 66
6378145.0
0.0818202
WGS72
WGS 72
6378135.0
0.0818188
WGS84
WGS 84
6378137.0
0.0818192

Version 5.7
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