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!
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
!
! SDDL Name:	WVVERT_SA_RF.SDDL
!
! Purpose:      This SDDL file defines the wvvert_sa_rf relation.
!
! Modification History:
!
!   Date       OPR      Who                       Reason
! --------   -------    ---   -------------------------------------------------
! 11/15/94    27329     SSS   Original implementation
!
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
!

LANGUAGE	FORTRAN, SQL

INCLUDE         ZSPSS_USER_TYPES.SDDL

RECORD  WVVERT_TYPE

    DESCRIPTION       "This relation contains the South Atlantic Anomaly (SAA)
                       and Radio Frequency Interferance (RFI) model data. 
                       Multiple models (contours) are represented for specific
                       flux densities.  Each model is described as a counter-
                       clockwise, convex, spherical polygon.  The polygon 
                       vertices are expressed in geodetic longitude and 
                       latitude.  This data is used by the ORBFILE/CREATE 
                       program to calculate HST SAA/RFI crossing intervals.  
                       The crossing times are stored in the orbit file data
                       structure for later use by the SPSS scheduling 
                       software. The data in this relation is maintained by
                       SCIOPSDB."


    FIELD  model_id
        TYPE SAA_MODEL_TYPE
    END_FIELD


    FIELD  active_flag
        TYPE YES_NO_FLAG_TYPE
        DESCRIPTION     "This is a flag which indicates whether the SAA model 
                         is active.  'Y' is active.  'N' is not active.
                         SAA crossing times are computed for active models 
                         only.  RFI crossing times are always computed 
                         regardless of the setting of this flag."
    END_FIELD


    FIELD  vertex_num
        TYPE            I*2
        DESCRIPTION     "This is a vertex number.  The SAA/RFI region is 
                         modelled by a convex polygon.  The arcs between whose 
                         vertices lie along great circles.   The vertices are 
                         ordered such that the interior of the SAA/RFI region
                         remains to the left as the boundary of the polygon
                         is traced."
    END_FIELD


    FIELD  latitude
        TYPE            R*4
        UNITS           "DEGREES"
        DESCRIPTION     "This is the geodetic latitude of the vertex on the
                         surface of the earth."
    END_FIELD


    FIELD  longitude
        TYPE            R*4
        UNITS           "DEGREES"
        DESCRIPTION     "This is the geodetic longitude of the vertex on the
                         surface of the earth."
    END_FIELD


    FIELD  flux_density
        TYPE            R*4
        UNITS           "PROTONS/CENTIMETER(squared)/SECOND"
        DESCRIPTION     "This is the flux density of the SAA contour.  This is 
                         specified only for vertex 1 of each SAA model."
    END_FIELD

END_RECORD


RELATION  wvvert_sa_rf
    TYPE             WVVERT_TYPE
    DESCRIPTION      "SAA/RFI Model Data Relation"
    SUBSYSTEM_USING  "SPSS", "SCIOPSDB"
    INDEX  wvvert_sa_rf_1
        TYPE         unique, clustered
        FIELDS       model_id, active_flag, vertex_num
    END_INDEX
END_RELATION


INSTANCE  wvvert_sa_rf
    GLOBAL
    TYPE        WVVERT_TYPE
END_INSTANCE

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