Pattern Intersection Extremals

The extremal points of the sensor pattern intersection report, based upon distance.

Four extremals are reported at each time step: the first is the most forward point, the second most rightward point, the third the most behind point, and the fourth the most leftward point.

The forward extremal is the largest positive value of the alongtrack distance; the leftward extremal is the largest positive value of the perpendicular-to-groundtrack distance; the behind and leftward extremals are defined analogously, using the largest negative values.

Note that it is possible to have multiple points on the pattern located at the same extremal angle; however, the data provider will still return only a single point for each extremal direction.

Available for these objects: Sensor

Type: Fixed data given specified evaluation intervals and step sizes.

Availability: Reports | Graphs | Dynamic Displays | Strip Charts

Data Provider Elements

Name	Dimension	Type	Description
Latitude	Latitude	Real Number or Text	The detic latitude (i.e., angle between the detic subpoint's surface normal vector and the XY plane.).
Longitude	Longitude	Real Number or Text	The detic longitude (i.e., angle from the X-axis locating the projection of the detic subpoint's surface normal vector onto the XY plane.) Longitude increases in the direction found using the right-hand rule about the Z-axis.
Altitude	Distance	Real Number	The altitude value (i.e., magnitude of the relative position vector between the object and its detic subpoint).
CBF X	Distance	Real Number	The X component of the position vector of the intersection point, expressed in the sensor's central body fixed system.
CBF Y	Distance	Real Number	The Y component of the position vector of the intersection point, expressed in the sensor's central body fixed system.
CBF Z	Distance	Real Number	The Z component of the position vector of the intersection point, expressed in the sensor's central body fixed system.
Range	Distance	Real Number	The range (i.e., distance between the primary and secondary object) at the given time.
Distance AlongGroundTrack	Distance	Real Number	A measure of distance to the intersection point along the ground track direction. Points forward of the sensor's detic subpoint are considered to have positive distances while points behind the detic subpoint will have negative distances. The distance is computed from the detic subpoint to the projection of the intersection point to a plane through the detic subpoint aligned with the ground track at that point.
Distance PerpToGroundTrack	Distance	Real Number	A measure of distance to the intersection point perpendicular to the ground track direction. Points left of the sensor's detic subpoint are considered to have positive distances while points right of the detic subpoint will have negative distances. The distance is computed from the detic subpoint to the projection of the intersection point to a plane through the detic subpoint perpendicular to the ground track at that point.
UTM Zone	Unitless	Text	The UTM Zone character indicator for the detic subpoint. Available only when the central body is Earth.
UTM Easting	Distance	Real Number	The easting value within the UTM zone for the detic subpoint. Available only when the central body is Earth.
UTM Northing	Distance	Real Number	The northing value within the UTM zone for the detic subpoint. Available only when the central body is Earth.
MGRS Cell	Unitless	Text	The MGRS (Military Grid Reference System) code for the cell area containing the detic subpoint. Available only when the central body is Earth.