! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! ! ! SDDL Name: APERTURE_DEF.SDDL ! ! Purpose: This SDDL file defines the aperture_def relation. ! ! Modification History: ! ! Date OPR Who Reason ! -------- ------- --- ------------------------------------------------- ! 01/20/99 34586 MSwam created from a subset of SPSS qaapertures table !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! ! LANGUAGE SQL RECORD APERTURE_DEF DESCRIPTION "This relation defines the size, shape, and location of the science instrument apertures. Three fundamental cartesian coordinate systems are used. The first of these systems is the V1-V2-V3 system. It is the three dimensional 'vehicle' coordinate system. The V2-V3 plane defines the 'aperture' plane. The other two fundamental coordinate systems are defined in the aperture plane relative to the V1,V2,V3 frame. The Science Instrument Coordinate System (SICS) is actually a set of coordinate systems; one or more for each science instrument. Coordinates are expressed in arcseconds. Generally there is one SICS defined for each aperture. The Science Aperture Coordinate System (SIAS) is similar to the SICS except the coordinates are expressed in units appropriate for the instrument (i.e. pixels). SIAS is not used in SPSS. This relation does NOT defines the conversion factors needed to transform coordinates expressed in one coordinate system to another. See the SPSS Algorithms document (SE-06-02 Appendix B) for a complete discussion of these transformations and see relation sics_sias_coef for the conversion coefficients." FIELD coord_id TYPE C10 DESCRIPTION "This is the aperture coordinate system ID. It is the name of the aperture coordinate system used to specify the location of the target within the aperture." END_FIELD FIELD valid_date TYPE C*17 DESCRIPTION "effective date (YYYY.DDD:HH:MM:SS) before which the data for this aperture must not be used" END_FIELD FIELD center_v2 TYPE R*8 UNITS "ARCSECONDS" DESCRIPTION "This field specifies the V2 coordinate of the center of the aperture. This defines the SICS X direction center (Xo)." END_FIELD FIELD center_v3 TYPE R*8 UNITS "ARCSECONDS" DESCRIPTION "This field specifies the V3 coordinate of the center of the aperture. This defines the SICS Y direction center (Yo)." END_FIELD FIELD aper_shape TYPE C1 DESCRIPTION "This field specifies the geometric shape of the aperture. The possible choices are 'P', 'C', 'Q', or 'R'. 'P' implies a pickle shape (FGS). 'C' implies a circular shape. 'Q' implies a quadrilateral shape. 'R' implies a rectangular shape." END_FIELD FIELD radius TYPE R*8 UNITS "ARCSECONDS" DESCRIPTION "This field is only significant for circular or pickle shaped apertures and is defined in the SICS system. For a circular aperture, this is the radius of the aperture measured from the center ('center_v2', 'center_v3'). For a pickle aperture, this is the outer radius." END_FIELD FIELD vertex1_x TYPE R*8 UNITS "ARCSECONDS" DESCRIPTION "This field is only significant for quadrilateral or rectangular shaped apertures and is defined in the SICS system. These apertures are defined in counter- clockwise order from vertex 1 to vertex 4. This is the X coordinate of vertex 1." END_FIELD FIELD vertex1_y TYPE R*8 UNITS "ARCSECONDS" DESCRIPTION "This field is only significant for quadrilateral or rectangular shaped apertures and is defined in the SICS system. These apertures are defined in counter- clockwise order from vertex 1 to vertex 4. This is the Y coordinate of vertex 1." END_FIELD FIELD vertex2_x TYPE R*8 UNITS "ARCSECONDS" DESCRIPTION "This field is only significant for quadrilateral or rectangular shaped apertures and is defined in the SICS system. These apertures are defined in counter- clockwise order from vertex 1 to vertex 4. This is the X coordinate of vertex 2." END_FIELD FIELD vertex2_y TYPE R*8 UNITS "ARCSECONDS" DESCRIPTION "This field is only significant for quadrilateral or rectangular shaped apertures and is defined in the SICS system. These apertures are defined in counter- clockwise order from vertex 1 to vertex 4. This is the Y coordinate of vertex 2." END_FIELD FIELD vertex3_x TYPE R*8 UNITS "ARCSECONDS" DESCRIPTION "This field is only significant for quadrilateral or rectangular shaped apertures and is defined in the SICS system. These apertures are defined in counter- clockwise order from vertex 1 to vertex 4. This is the X coordinate of vertex 3." END_FIELD FIELD vertex3_y TYPE R*8 UNITS "ARCSECONDS" DESCRIPTION "This field is only significant for quadrilateral or rectangular shaped apertures and is defined in the SICS system. These apertures are defined in counter- clockwise order from vertex 1 to vertex 4. This is the Y coordinate of vertex 3." END_FIELD FIELD vertex4_x TYPE R*8 UNITS "ARCSECONDS" DESCRIPTION "This field is only significant for quadrilateral or rectangular shaped apertures and is defined in the SICS system. These apertures are defined in counter- clockwise order from vertex 1 to vertex 4. This is the X coordinate of vertex 4." END_FIELD FIELD vertex4_y TYPE R*8 UNITS "ARCSECONDS" DESCRIPTION "This field is only significant for quadrilateral or rectangular shaped apertures and is defined in the SICS system. These apertures are defined in counter- clockwise order from vertex 1 to vertex 4. This is the Y coordinate of vertex 4." END_FIELD FIELD vertex1_v2 TYPE R*8 UNITS "ARCSECONDS" DESCRIPTION "This field is only significant for quadrilateral or rectangular shaped apertures and is defined in the V2-V3 system. These apertures are defined in counter-clockwise order from vertex 1 to vertex 4. This is the V2 coordinate of vertex 1." END_FIELD FIELD vertex1_v3 TYPE R*8 UNITS "ARCSECONDS" DESCRIPTION "This field is only significant for quadrilateral or rectangular shaped apertures and is defined in the V2-V3 system. These apertures are defined in counter-clockwise order from vertex 1 to vertex 4. This is the V3 coordinate of vertex 1." END_FIELD FIELD vertex2_v2 TYPE R*8 UNITS "ARCSECONDS" DESCRIPTION "This field is only significant for quadrilateral or rectangular shaped apertures and is defined in the V2-V3 system. These apertures are defined in counter-clockwise order from vertex 1 to vertex 4. This is the V2 coordinate of vertex 2." END_FIELD FIELD vertex2_v3 TYPE R*8 UNITS "ARCSECONDS" DESCRIPTION "This field is only significant for quadrilateral or rectangular shaped apertures and is defined in the V2-V3 system. These apertures are defined in counter-clockwise order from vertex 1 to vertex 4. This is the V3 coordinate of vertex 2." END_FIELD FIELD vertex3_v2 TYPE R*8 UNITS "ARCSECONDS" DESCRIPTION "This field is only significant for quadrilateral or rectangular shaped apertures and is defined in the V2-V3 system. These apertures are defined in counter-clockwise order from vertex 1 to vertex 4. This is the V2 coordinate of vertex 3." END_FIELD FIELD vertex3_v3 TYPE R*8 UNITS "ARCSECONDS" DESCRIPTION "This field is only significant for quadrilateral or rectangular shaped apertures and is defined in the V2-V3 system. These apertures are defined in counter-clockwise order from vertex 1 to vertex 4. This is the V3 coordinate of vertex 3." END_FIELD FIELD vertex4_v2 TYPE R*8 UNITS "ARCSECONDS" DESCRIPTION "This field is only significant for quadrilateral or rectangular shaped apertures and is defined in the V2-V3 system. These apertures are defined in counter-clockwise order from vertex 1 to vertex 4. This is the V2 coordinate of vertex 4." RANGE "0 .. 3600" END_FIELD FIELD vertex4_v3 TYPE R*8 UNITS "ARCSECONDS" DESCRIPTION "This field is only significant for quadrilateral or rectangular shaped apertures and is defined in the V2-V3 system. These apertures are defined in counter-clockwise order from vertex 1 to vertex 4. This is the V3 coordinate of vertex 4." RANGE "0 .. 3600" END_FIELD FIELD aper_ref_ang TYPE R*8 UNITS "DEGREES" DESCRIPTION "This is the aperture reference angle (Ta). It specifies the rotation angle needed to transform from SICS to V2V3 coordinate systems. The angle is measured counter-clockwise as viewed looking along the +V1-axis from the V3-axis to the positive side of the aperture's major axis." RANGE "0 .. 360" END_FIELD FIELD polynomial TYPE I*2 DESCRIPTION "This field indicates the degree of the polynomial used in the transformation from SIAS to SICS. The maximum value is 5." END_FIELD FIELD x_sic_center TYPE R*8 DESCRIPTION "This is the x coordinate (in pixels) of the origin of the SICS system expressed in the SIAS system. " END_FIELD FIELD y_sic_center TYPE R*8 DESCRIPTION "This is the y coordinate (in lines) of the origin of the SICS system expressed in the SIAS system." END_FIELD FIELD x_sia_center TYPE R*8 DESCRIPTION "This is the x coordinate of the origin of the SIAS system expressed in the SICS system." END_FIELD FIELD y_sia_center TYPE R*8 DESCRIPTION "This is the y coordinate of the origin of the SIAS system expressed in the SICS system." END_FIELD END_RECORD RELATION aperture_def TYPE APERTURE_DEF DESCRIPTION "Definition of apertures" SUBSYSTEM_USING "OPUS" INDEX aperture_def_1 TYPE unique, clustered FIELDS coord_id, valid_date END_INDEX END_RELATION INSTANCE aperture_def GLOBAL TYPE APERTURE_DEF END_INSTANCE