European Space Agency

Royal Belgian Institute for Aeronomy

um536 - geodetic to geocentric transformation

subroutine  um536(mgde, mgeo)

Parameters:

• mgde [zgeo,in] :: geodetic location

• mgeo [zgeo,out] :: geocentric location

Description

The subroutine UM536 transforms geodetic coordinates into geocentric coordinates in function of the geoid parameters stored in the common block UC160 (see Astron.J. 66, 15 [1961]). Note that both locations are specified in spherical coordinates. For the geodetic coordinates, the RADIUS refers to the geodetic altitude incremented by a mean Earth’s radius (see /zgeo/). When cartesian coordinates or other coordinates systems (GEI, SM, GSM, MAG) have to be used, the coordinate transformations can be realized with the help of subroutines UT541, UT546, UT550 and UT555.

References

• Astron.J. 66, 15 [1961]

Diagnostics

None

Common Blocks

• uc160 - general constants

Dependencies

Called by

None

Calls

None

See also

• um535 - geocentric to geodetic transformation

• ut541 - Convert spherical coordinates to cartesian coordinates

• ut546 - convert cartesian coordinates to spherical coordinates

• ut550 - select a coordinate transformation

• ut555 - coordinate conversion

Reported Bugs

None

Examples

• Ex #1. Evaluation of the magnetic field vector

• Ex #2. Evaluation of the (B-L) coordinates

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UNILIB/tags/v3.02