Entity pty_absolute_orientation_array

• Defines an absolute orientation of a "positive axis" at each node of a grid.

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 "positive axis" clockwise from
                                          "north". This value asserts that all nodes of
                                          the grid have the same orientation. 

data_value                                N       ndt_absolute_orientation_array

                                          The orientation of the "positive axis" defined
                                          at each node on a grid. These orientations may
                                          have been derived from the "chassis" orientation.
                                          Described using one or both of the following values:
                                          "azimuth" and "inclination". 

inclination                               N       ndt_plane_angle

                                          The inclination of the "positive axis" relative
                                          to the downward vertical direction. This value
                                          asserts that all nodes of the grid have the same
                                          inclination. 

ref_north_axis_direction                  M       ref_north_axis_direction

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

receiver_definition                       U       seismic_geometry_set

                                          May be a property of seismic geometry set. The
                                          grid must be the same as was defined 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). For
                                          receivers, the "positive axis" is the direction
                                          along the axis of the receiver such that the case
                                          motion in that direction produces a positive initial
                                          voltage and a positive number on tape. 

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. For sources, the "positive axis" is the direction
                                          of initial ground motion. 

End of entity pty_absolute_orientation_array

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