org.openstreetmap.josm.data.projection.proj

Class DoubleStereographic

java.lang.Object

org.openstreetmap.josm.data.projection.proj.DoubleStereographic

All Implemented Interfaces:

Proj

public class DoubleStereographic
extends Object
implements Proj

Implementation of the stereographic double projection, also known as Oblique Stereographic and the Schreiber double stereographic projection.

Field Summary

Fields

Modifier and Type	Field and Description
private double	c
private double	chi0
private double	e
private Ellipsoid	ellps
private static double	EPSILON
private double	n
private double	R

Constructor Summary

Constructors

Constructor and Description
DoubleStereographic()

Method Summary

Modifier and Type	Method and Description
Bounds	getAlgorithmBounds() Return the bounds where this projection is applicable.
String	getName() Replies a human readable name of this projection.
String	getProj4Id() Replies the Proj.4 identifier.
private void	initialize(double lat_0)
void	initialize(ProjParameters params) Initialize the projection using the provided parameters.
double[]	invproject(double x, double y) Convert east/north to lat/lon.
double[]	project(double phi, double lambda) Convert lat/lon to east/north.

Methods inherited from class java.lang.Object

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

Field Detail

ellps

private Ellipsoid ellps

e

private double e

n

private double n

c

private double c

chi0

private double chi0

R

private double R

EPSILON

private static final double EPSILON

See Also:

Constant Field Values

Constructor Detail

DoubleStereographic

public DoubleStereographic()

Method Detail

getName

public String getName()

Description copied from interface: Proj

Replies a human readable name of this projection.

Specified by:

getName in interface Proj

Returns:

The projection name. must not be null.

getProj4Id

public String getProj4Id()

Description copied from interface: Proj

Replies the Proj.4 identifier.

Specified by:

getProj4Id in interface Proj

Returns:

The Proj.4 identifier (as reported by cs2cs -lp). If no id exists, return null.

initialize

public void initialize(ProjParameters params)
                throws ProjectionConfigurationException

Description copied from interface: Proj

Initialize the projection using the provided parameters.

Specified by:

initialize in interface Proj

Parameters:

params - The projection parameters

Throws:

ProjectionConfigurationException - in case parameters are not suitable

initialize

private void initialize(double lat_0)

project

public double[] project(double phi,
                        double lambda)

Description copied from interface: Proj

Convert lat/lon to east/north.

Specified by:

project in interface Proj

Parameters:

phi - the latitude in radians

lambda - the longitude in radians

Returns:

array of length 2, containing east and north value in meters, divided by the semi major axis of the ellipsoid.

invproject

public double[] invproject(double x,
                           double y)

Description copied from interface: Proj

Convert east/north to lat/lon.

Specified by:

invproject in interface Proj

Parameters:

x - east value in meters, divided by the semi major axis of the ellipsoid

y - north value in meters, divided by the semi major axis of the ellipsoid

Returns:

array of length 2, containing lat and lon in radians.

getAlgorithmBounds

public Bounds getAlgorithmBounds()

Description copied from interface: Proj

Return the bounds where this projection is applicable. This is a fallback for when the projection bounds are not specified explicitly. In this area, the round trip lat/lon -> east/north -> lat/lon should return the starting value with small error. In addition, regions with extreme distortions should be excluded, if possible. It need not be the absolute maximum, but rather an area that is safe to display in JOSM and contain everything that one would expect to use.

Specified by:

getAlgorithmBounds in interface Proj

Returns:

the bounds where this projection is applicable, null if unknown