Data Provider Elements

Pattern Angle Extremals Intersection

Provides information about the points of the sensor pattern where an angle from a reference direction to the pattern reaches a minimum or maximum value. The angle to each point in the sensor pattern is computed in the local horizontal plane, the plane whose normal lies along the sensor's detic nadir (i.e., along the surface normal passing through the sensor's location). The reference direction in this plane is the sensor's ground velocity (i.e., the velocity of the sensor's detic subpoint) that is always perpendicular to the surface normal. For each point in the sensor pattern, the direction from the sensor to that point in the pattern is first projected into the local horizontal plane, and then the angle is measured from the ground velocity direction to this projection. The data provider then searches for the minimum and maximum angle values and reports out information about these extremals in the angle to the sensor pattern.

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.
Extremal Angle	Angle	Real Number or Text	Angle between the reference plane and the plane that passes through the extremal points of the sensor pattern. The angle is measured about the direction of the ground velocity vector.
Line Number	Unitless	Integer	Unique line identifier for each extremal point so that the points computed at various times can be grouped together correctly into extremal lines.
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.