Mapping Toolbox

par2geod

Convert from parametric to geodetic latitudes

Syntax

• lat = par2geod(lat0)
  lat = par2geod(lat0,geoid)
  lat = par2geod(lat,units)
  lat = par2geod(lat,geoid,units)
  

Background

Longitudes have the same meaning whether the Earth is treated as a sphere or as an ellipsoid. However, the definition of latitude in the case of an ellipsoid is more complicated. Geodetic, or geographic, latitudes on an ellipsoid can be transformed from latitudes on an auxiliary sphere with certain properties.

Geodetic latitude: (also called geographic latitude) the angle a normal line passing through a surface point makes with the plane of the Equator.

Parametric latitude: latitudes on the set of spheres with parallel radii identical to the ellipsoidal parallel radii at every latitude.

Description

lat = par2geod(lat0) returns the parametric latitudes provided in lat0 transformed to geodetic latitudes, which are returned in lat.

lat = par2geod(lat0,geoid) defines the elliptical model of the Earth, given by the geoid vector geoid, to which lat0 is transformed. The default geoid is the same as the default of almanac('earth','geoid'), the 1980 Geodetic Reference System ellipsoid.

lat = par2geod(lat,geoid,units) defines the angle units of the inputs and outputs, where units is any valid angle units string. The default is 'degrees'.

Examples

• lat = par2geod([0 45 90])
  lat =
           0   45.0962   90.0000
  

See Also

almanac	Planetary data
geod2par iso2geod	Other auxiliary latitude functions

paperscale

patchesm