public class AlongTrackAiming extends Object implements TileAiming
ConstantAzimuthAiming
,
DivertedSingularityAiming
Constructor and Description |
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AlongTrackAiming(OneAxisEllipsoid ellipsoid,
Orbit orbit,
boolean isAscending)
Simple constructor.
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Modifier and Type | Method and Description |
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Vector3D |
alongTileDirection(Vector3D point,
GeodeticPoint gp)
Find the along tile direction for tessellation at specified point.
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List<GeodeticPoint> |
getSingularPoints()
Get points at which aiming direction cannot be computed.
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public AlongTrackAiming(OneAxisEllipsoid ellipsoid, Orbit orbit, boolean isAscending)
ellipsoid
- ellipsoid body on which the zone is definedorbit
- orbit along which tiles should be alignedisAscending
- indicator for zone tiling with respect to ascending
or descending orbitspublic List<GeodeticPoint> getSingularPoints()
As per Brouwer's hairy ball theorem, any vector field on the 2-sphere has at least one zero. This implies that any implementation of this interface has at least one point where the aiming direction cannot be computed. The most typical example is aiming always towards North pole, for which both poles are singular points.
getSingularPoints
in interface TileAiming
public Vector3D alongTileDirection(Vector3D point, GeodeticPoint gp)
alongTileDirection
in interface TileAiming
point
- point on the ellipsoid (Cartesian coordinates)gp
- point on the ellipsoid (geodetic coordinates)Copyright © 2002-2020 CS Group. All rights reserved.