Ellipsoid

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Overview

Ellipsoid is a class used for geometric computation on an ellipsoid.  There are enough of class functions to handle such classical problems, like direct and inverse problem, 3D space coordinate transformation, calculation of a meridian arc length and so on.

Ellipsoid has an extensive database of almost all ellipsoids and Datums used all over the world.  It is most likely that the ellipsoid you want is already in the database.  The two class functions, "list" and "listdatum", can give a list of all available preset ellipsoid and datum, which can be later on assigned to an ellipsoid via functions "set" and "setdatum".

Ellipsoid is also used in map projection class, "Projection", where it is one of parameters needed to define.

Member data

Only a, f, Cx, Cy and Cz are used in identification of an ellipsoid.  Name and datum are optional information.

Operator

no operator provided.

Construction function

{Ellipsoid} ret  =  ELLIPSOID([{double} argm1, {double} argm2, {String} argm3, {double} argm4, {double} argm5, {double} argm6])

argm1 = semi-major axis                          (default = 6378137)

argm2 = flattening                               (default = 1 / 298.2572235630)

argm3 = datum name                               (default = "not_specified")

argm4 = shift in X-axis from center of the earth (default = 0.000)

argm5 = shift in Y-axis from center of the earth (default = 0.000)

argm6 = shift in Z-axis from center of the earth (default = 0.000)

**Note that the default ellipsoid is that of "WGS84" datum.

Example:

Lfunction

object.NAME()  =  {String} left-value

object.DATUM() =  {String} left-value

object.A()     =  {double} left-value

object.F()     =  {double} left-value

object.CX()    =  {double} left-value

object.CY()    =  {double} left-value

object.CZ()    =  {double} left-value

Example:

Class function

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