Entity pty_chassis_orientation_array

• Defines the chassis orientation at each node of a grid. The orientation is defined in the following terms: "chassis inclination", "chassis azimuth" and "chassis rotation" The "chassis inclination" is the inclination of the positive axis from downward vertical. The "chassis azimuth" is the azimuth of the "chassis inclination" with respect to "north". The "chassis rotation" is the horizontal rotation of the chassis reference direction marking clockwise from "north".

Attribute                                 Flags   Data Type

From property:
   data_collection                        IV      set[0 .. N] of (data_collection)

                                          Indicates the data collections that include this
                                          instance of E and P data. 

   graphical_element                      IV      set[0 .. N] of (graphical_element)

                                          Specifies one or more graphical elements which
                                          are depicting this data item. 

   activity                               I       activity

                                          Defines the activity which created this instance.

   process_data_item                      IV      set[0 .. N] of (process_data_item)

                                          Defines where this data was used by an activity.

   other_spatial_object                   I       other_spatial_object

                                          may be a property of 


azimuth                                   N       ndt_azimuth

                                          The azimuth of the chassis inclination with respect
                                          to "north". This value asserts that all nodes
                                          of the grid have the same chassis azimuth. 

data_value                                N       ndt_relative_orientation_array

                                          The orientation of the chassis at each node of
                                          a grid. Described using one or more of the following
                                          values: "inclination", "azimuth" and "rotation".

inclination                               N       ndt_plane_angle

                                          The inclination of the direction of initial ground
                                          motion relative to a downward vertical axis. This
                                          value asserts that the source facility for all
                                          source events have the same chassis inclination.

ref_north_axis_direction                  M       ref_north_axis_direction

                                          The meaning of North, e.g., true or magnetic.

rotation                                          ndt_logical

                                          The horizontal rotation of the chassis "reference
                                          direction marking" clockwise from "north". This
                                          value asserts that all nodes of the grid have
                                          the same chassis rotation. 

receiver_definition                       U       seismic_geometry_set

                                          May be a property of seismic geometry set. The
                                          grid used must match the grid specified by attribute
                                          receiver uid in the associated seismic geometry
                                          set (i.e., fixed facilities). If receiver uid
                                          is not defined in seismic geometry set then the
                                          grid must be the same as was defined by attribute
                                          field trace uid (i.e., moving facilities). 

source_definition                         U       seismic_geometry_set

                                          May be a property of seismic geometry set. The
                                          grid must be the same as was defined by attribute
                                          source event uid in the associated seismic geometry
                                          set. 

End of entity pty_chassis_orientation_array

M - mandatory, U - unique, I - inherited, V - inverse, N - named type