com.luciad.geometry.topology.ellipsoidal

Advanced GIS EngineClass TLcdEllipsoidalAdvancedBinaryTopology

java.lang.Object

com.luciad.geometry.topology.ellipsoidal.TLcdEllipsoidalAdvancedBinaryTopology

All Implemented Interfaces:

ILcd2DAdvancedBinaryTopology

public class TLcdEllipsoidalAdvancedBinaryTopology
extends Object
implements ILcd2DAdvancedBinaryTopology

Implementation of ILcd2DAdvancedBinaryTopology on an ellipsoidal model. This implementation currently supports instances of the following interfaces:

• ILcdPoint,
• ILcdPolyline,
• ILcdPolygon,
• ILcdComplexPolygon,
• ILcdArc,
• ILcdCircularArc,
• ILcdEllipse,
• ILcdCircle,
• ILcdBounds,
• ILcdArcBand,
• ILcdGeoBuffer,
• ILcdVariableGeoBuffer.

Cartesian geometry (e.g. TLcdXYPolyline) is supported by this implementation. Straight lines are treated as geodesic lines (i.e the coordinates of a cartesian geometry are interpreted as lon/lat coordinates).

Performance

The current implementation caches (intermediate) results for ILcdShape instances which implement the ILcdCache interface. When performing repeated checks with the same shape or shapes, it is generally more efficient to reuse the same ILcd2DAdvancedBinaryTopology object, instead of creating a new instance for every check.

Since:

10.0

Constructor Summary

Constructors

Constructor and Description
TLcdEllipsoidalAdvancedBinaryTopology(ILcdEllipsoid aEllipsoid) Constructor for TLcdEllipsoidalAdvancedBinaryTopology
TLcdEllipsoidalAdvancedBinaryTopology(ILcdEllipsoid aEllipsoid, double aTolerance) Constructor for TLcdEllipsoidalAdvancedBinaryTopology allowing to specify a tolerance.

Method Summary

Modifier and Type	Method and Description
boolean	checkTopology(ILcdShape aShape1, ILcdShape aShape2, ILcdIntersectionMatrixPattern aMatrixPattern) Checks whether the two given shapes satisfy the binary topology relation defined by the given matrix pattern.
ILcdIntersectionMatrix	computeIntersectionMatrix(ILcdShape aShape1, ILcdShape aShape2) Computes the intersection matrix of the two given shapes.
ILcdEllipsoid	getEllipsoid() Returns the ellipsoid on which the binary topology relations are computed
double	getTolerance() Returns the tolerance value (expressed in meters) used in the binary topology computations when checking the equality of two points.
void	setEllipsoid(ILcdEllipsoid aEllipsoid) Sets the ellipsoid on which the binary topology relations are computed
void	setTolerance(double aTolerance) Sets the tolerance value used in the binary topology computations when checking the equality of two points.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

TLcdEllipsoidalAdvancedBinaryTopology

public TLcdEllipsoidalAdvancedBinaryTopology(ILcdEllipsoid aEllipsoid)

Constructor for TLcdEllipsoidalAdvancedBinaryTopology

Parameters:

aEllipsoid - ellipsoid on which the binary topology relations are computed.

TLcdEllipsoidalAdvancedBinaryTopology

public TLcdEllipsoidalAdvancedBinaryTopology(ILcdEllipsoid aEllipsoid,
                                             double aTolerance)

Constructor for TLcdEllipsoidalAdvancedBinaryTopology allowing to specify a tolerance.

In some cases, the result obtained when checking the topological relation between two shapes depends on the accuracy of the data used to represent both shapes.

For example, you would expect that neighboring countries touch but not overlap. However, if the contours of the polygons used to represent both countries slightly cross at the common border (due to small errors in the data), the calculations would lead to the opposite result.

This constructor allow you to set a tolerance value which is taken into account in the topology calculations. Points that lie within this tolerance value from each other are considered to be coincident.

Parameters:

aTolerance - tolerance value (expressed in meters) used to determine the equality of two points in the topology calculations. This value should be larger than 0.01m.

aEllipsoid - ellipsoid on which the binary topology relations are computed.

Method Detail

computeIntersectionMatrix

public ILcdIntersectionMatrix computeIntersectionMatrix(ILcdShape aShape1,
                                                        ILcdShape aShape2)

Description copied from interface: ILcd2DAdvancedBinaryTopology

Computes the intersection matrix of the two given shapes. Both shapes must be in the same coordinate system.

Specified by:

computeIntersectionMatrix in interface ILcd2DAdvancedBinaryTopology

Parameters:

aShape1 - the first shape

aShape2 - the second shape

Returns:

the intersection matrix of the two given shapes

checkTopology

public boolean checkTopology(ILcdShape aShape1,
                             ILcdShape aShape2,
                             ILcdIntersectionMatrixPattern aMatrixPattern)

Description copied from interface: ILcd2DAdvancedBinaryTopology

Checks whether the two given shapes satisfy the binary topology relation defined by the given matrix pattern. Both shapes must be in the same coordinate system.

Specified by:

checkTopology in interface ILcd2DAdvancedBinaryTopology

Parameters:

aShape1 - the first shape

aShape2 - the second shape

aMatrixPattern - the matrix pattern defining the binary topology relation to be checked

Returns:

true if the binary topology relation defined by aMatrixPattern holds true for aShape1 and aShape2, false otherwise.

getTolerance

public double getTolerance()

Returns the tolerance value (expressed in meters) used in the binary topology computations when checking the equality of two points.

Returns:

tolerance value (expressed in meters) used in the binary topology computations when checking the equality of two points.

setTolerance

public void setTolerance(double aTolerance)

Sets the tolerance value used in the binary topology computations when checking the equality of two points. The tolerance value should be expressed in meters. (The default value is 0.01m.)

Parameters:

aTolerance - tolerance value (expressed in meters) used in the binary topology computations.

getEllipsoid

public ILcdEllipsoid getEllipsoid()

Returns the ellipsoid on which the binary topology relations are computed

Returns:

ellipsoid on which the binary topology relations are computed.

setEllipsoid

public void setEllipsoid(ILcdEllipsoid aEllipsoid)

Sets the ellipsoid on which the binary topology relations are computed

Parameters:

aEllipsoid - ellipsoid on which the binary topology relations are computed.