Mapping Toolbox

n2ecc

Convert from the n to the eccentricity representation of the ellipsoid

Syntax

• eccentricity = n2ecc(n)
  

Description

Eccentricity and the parameter n are two methods of defining an ellipsoid. The definition of n is:

(semimajor axis - semiminor axis)/(semimajor axis + semiminor axis).

eccentricity = n2ecc(n) returns the equivalent eccentricities for the input n parameters. If the input, n, is a two-column vector, only the second column is used. This allows two-element vectors to be used as rows of the input, since the form [semimajor-axis, n] is a complete representation of an ellipsoid (but is not the standard form for geoid vectors in the Mapping Toolbox). In all other cases, all columns of the input are used.

Example

• ecc = n2ecc(0.00167922039463)
  ecc =
     0.08181919104285
  

This eccentricity is the default value for the Earth.

See Also

almanac	Planetary data
ecc2flat majaxis	Similar conversion functions
ecc2n	Convert from eccentricity to n

mlabelzero22pi

namem