Data Provider Groups | Data Provider Elements

Event Data

Reports certain data at defined event times during each interval, for strands consisting of only two objects. The 'From-object' is the first object listed in the strand; the 'To-object' is the second object listed. Values are reported for each strand access interval that lies within the requested report intervals.

The azimuth and elevation angles are reported with respect to a frame determined by the first object. The azimuth angle is the angle from the X axis (positive about the Z-axis) to the projection of the apparent relative position vector into the XY plane. The elevation is the angle of the apparent relative position vector from the XY plane, with positive angles being used when the vector has a negative Z component.

When the first object is a Facility, Place, or Target, the XYZ frame is Topocentric (X aligned with North, Y aligned with East, and Z aligned with the detic nadir of the detic subpoint of the first object with respect to its central body).

When the first object is a Satellite, Missile, or LaunchVehicle, the XYZ frame is CbiVVLH (inertial vehicle velocity local horizontal frame, with the Z axis aligned with the anti-radial direction and the X axis constrained toward the inertial velocity direction).

When the first object is an Aircraft, GroundVehicle, or Ship, the XYZ frame is CbfVVLH (fixed vehicle velocity local horizontal frame, with the Z axis aligned with the anti-radial direction and the X axis constrained toward the central body fixed velocity direction) when the central body fixed velocity is not close to zero; when the velocity is close to zero, then the Topocentric frame is used.

When the first object is a Sensor, then the frame is determined by its parent object as described above.

Available for these objects: Chain

Type: Interval data.

Availability: Reports

Data Provider Groups

Name	Description
AOS	The event time is the start time of the interval (a.k.a. acquisition of signal).
LOS	The event time is the end time of the interval (a.k.a. loss of signal).
TME	The event time is the time of maximum elevation during the interval.
TCA	The event time is the time of closest approach (i.e., minimum range) during the interval.

Data Provider Elements

Name	Dimension	Type	Description
Strand Name	Unitless	Text	The name of strand.
Event	Unitless	Text	AOS, LOS, TME, or TCA.
ETime	Date	Real Number or Text	The time of the event.
Azimuth	Angle	Real Number or Text	The apparent azimuth at the given time.
Elevation	Angle	Real Number or Text	The apparent elevation at the event time.
Range	Distance	Real Number	The apparent range between the two objects at the event time.
Solar Elev	Angle	Real Number or Text	The elevation of the apparent position of the sun.
From Lat	Latitude	Real Number or Text	The detic latitude of the From-object at the event time.
From Lon	Longitude	Real Number or Text	The detic longitude of the From-object at the event time.
From Alt	Distance	Real Number	The detic altitude of the From-object at the event time.
To Lat	Latitude	Real Number or Text	The detic latitude of the To-object at the event time.
To Lon	Longitude	Real Number or Text	The detic longitude of the To-object at the event time.
To Alt	Distance	Real Number	The detic altitude of the To-object at the event time.
From Pass	Unitless	Text	The pass number of the From-object at the event time. If the object does not support the computation of passes, then the value will be "N/A".
To Pass	Unitless	Text	The pass number of the From-object at the event time. If the object does not support the computation of passes, then the value will be "N/A".
From UTM Zone	Unitless	Text	The UTM Zone character indicator for the detic subpoint of the From-object at the event time. Available only when the central body is Earth.
From UTM Easting	Distance	Real Number	The easting value within the UTM zone for the detic subpoint of the From-object at the event time. Available only when the central body is Earth.
From UTM Northing	Distance	Real Number	The northing value within the UTM zone for the detic subpoint of the From-object at the event time. Available only when the central body is Earth.
From MGRS Cell	Unitless	Text	The MGRS (Military Grid Reference System) code for the cell area containing the detic subpoint of the From-object at the event time. Available only when the central body is Earth.
To UTM Zone	Unitless	Text	The UTM Zone character indicator for the detic subpoint of the To-object at the event time. Available only when the central body is Earth.
To UTM Easting	Distance	Real Number	The easting value within the UTM zone for the detic subpoint of the To-object at the event time. Available only when the central body is Earth.
To UTM Northing	Distance	Real Number	The northing value within the UTM zone for the detic subpoint of the To-object at the event time. Available only when the central body is Earth.
To MGRS Cell	Unitless	Text	The MGRS (Military Grid Reference System) code for the cell area containing the detic subpoint of the To-object at the event time. Available only when the central body is Earth.