Modeling the Earth
Represent the shape and size of the Earth; represent ellipsoids; convert between parameters
Functions
geocrs |
Geographic coordinate reference system object |
wgs84Ellipsoid |
Reference ellipsoid for World Geodetic System 1984 |
egm96geoid |
Geoid height from Earth Gravitational Model 1996 (EGM96) |
earthRadius |
Mean radius of planet Earth |
rcurve |
Ellipsoidal radii of curvature |
rsphere |
Radii of auxiliary spheres |
geocentricLatitude |
Convert geodetic to geocentric latitude |
parametricLatitude |
Convert geodetic to parametric latitude |
geodeticLatitudeFromGeocentric |
Convert geocentric to geodetic latitude |
geodeticLatitudeFromParametric |
Convert parametric to geodetic latitude |
axes2ecc |
Eccentricity of ellipse from axes lengths |
majaxis |
Semimajor axis of ellipse |
minaxis |
Semiminor axis of ellipse |
ecc2flat |
Flattening of ellipse from eccentricity |
flat2ecc |
Eccentricity of ellipse from flattening |
ecc2n |
Third flattening of ellipse from eccentricity |
n2ecc |
Eccentricity of ellipse from third flattening |
Classes
Topics
The Earth can be modeled with increasing precision as a perfect sphere, an oblate spheroid, an ellipsoid, or a geoid.
A reference spheroid is a model of a roughly-spherical astronomical body with a simplified geometry, such as a sphere with uniform radius or a standard ellipsoid.
Use reference spheroids to create map projections, to calculate curves and areas on the surface of a spheroid, and to transform 3-D geodetic coordinates.
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