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Trapped Radiation ENvironment model Development

UM536

[ Name | Synopsis | Arguments | Description | Diagnostics | Common Blocks | Dependencies | See Also | Reported Bugs | Examples ]

Name

    Subroutine UM536 - geodetic to geocentric transformation

Synopsis

      RECORD /zgeo/ mgde
      RECORD /zgeo/ mgeo
      
      CALL UM536 (mgde, mgeo )

Arguments

    mgde
    Geodetic location [in]
    mgeo
    Geocentric location (GEO) [out]

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.

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

    #1, evaluation of the magnetic field vector
    #2, evaluation of the (B, L) coordinates