org.geotools.referencing.operation.projection
Class EquidistantCylindrical

java.lang.Object
  extended by org.geotools.referencing.wkt.Formattable
      extended by org.geotools.referencing.operation.transform.AbstractMathTransform
          extended by org.geotools.referencing.operation.projection.MapProjection
              extended by org.geotools.referencing.operation.projection.EquidistantCylindrical
All Implemented Interfaces:
java.io.Serializable, org.opengis.referencing.operation.MathTransform, org.opengis.referencing.operation.MathTransform2D
Direct Known Subclasses:
PlateCarree

public class EquidistantCylindrical
extends MapProjection

Equidistant cylindrical projection (EPSG code 9823). In the particular case where the standard_parallel_1 is 0°, this projection is also called Plate Carree or Equirectangular. This is used in, for example, WGS84 / Plate Carree (EPSG:32662).

References:

Since:
2.2
Version:
$Id: EquidistantCylindrical.java 34859 2010-02-03 19:30:23Z aaime $
Author:
John Grange, Martin Desruisseaux
See Also:
Cylindrical Equidistant projection on MathWorld, "Equirectangular" on RemoteSensing.org, Serialized Form

Nested Class Summary
static class EquidistantCylindrical.Provider
          The math transform provider for an Equidistant Cylindrical projection (EPSG code 9823).
static class EquidistantCylindrical.SphericalProvider
          The math transform provider for an Equidistant Cylindrical projection, spherical case
 
Nested classes/interfaces inherited from class org.geotools.referencing.operation.projection.MapProjection
MapProjection.AbstractProvider
 
Field Summary
protected  double standardParallel
          Standard parallel parameter.
 
Fields inherited from class org.geotools.referencing.operation.projection.MapProjection
centralMeridian, en0, en1, en2, en3, en4, excentricity, excentricitySquared, falseEasting, falseNorthing, globalScale, isSpherical, latitudeOfOrigin, LOGGER, scaleFactor, semiMajor, semiMinor
 
Fields inherited from class org.geotools.referencing.wkt.Formattable
SINGLE_LINE
 
Constructor Summary
protected EquidistantCylindrical(org.opengis.parameter.ParameterValueGroup parameters)
          Constructs a new map projection from the supplied parameters.
 
Method Summary
 boolean equals(java.lang.Object object)
          Compares the specified object with this map projection for equality.
 org.opengis.parameter.ParameterDescriptorGroup getParameterDescriptors()
          Returns the parameter descriptors for this map projection.
 org.opengis.parameter.ParameterValueGroup getParameterValues()
          Returns the parameter values for this map projection.
 int hashCode()
          Returns a hash value for this projection.
protected  java.awt.geom.Point2D inverseTransformNormalized(double x, double y, java.awt.geom.Point2D ptDst)
          Transforms the specified (x,y) coordinates and stores the result in ptDst.
protected  java.awt.geom.Point2D transformNormalized(double x, double y, java.awt.geom.Point2D ptDst)
          Transforms the specified (λ,φ) coordinates (units in radians) and stores the result in ptDst (linear distance on a unit sphere).
 
Methods inherited from class org.geotools.referencing.operation.projection.MapProjection
getSourceDimensions, getTargetDimensions, getToleranceForAssertions, inv_mlfn, inverse, mlfn, resetWarnings, transform, transform, transform
 
Methods inherited from class org.geotools.referencing.operation.transform.AbstractMathTransform
createTransformedShape, derivative, derivative, ensureNonNull, formatWKT, getName, isIdentity, needCopy, rollLongitude, transform, transform, transform
 
Methods inherited from class org.geotools.referencing.wkt.Formattable
cleanupThreadLocals, toString, toWKT, toWKT, toWKT
 
Methods inherited from class java.lang.Object
clone, finalize, getClass, notify, notifyAll, wait, wait, wait
 
Methods inherited from interface org.opengis.referencing.operation.MathTransform2D
createTransformedShape, derivative
 
Methods inherited from interface org.opengis.referencing.operation.MathTransform
derivative, isIdentity, toWKT, transform, transform, transform
 

Field Detail

standardParallel

protected final double standardParallel
Standard parallel parameter. Set to 0° for the PlateCarree case.

Constructor Detail

EquidistantCylindrical

protected EquidistantCylindrical(org.opengis.parameter.ParameterValueGroup parameters)
                          throws org.opengis.parameter.ParameterNotFoundException
Constructs a new map projection from the supplied parameters.

Parameters:
parameters - The parameter values in standard units.
Throws:
org.opengis.parameter.ParameterNotFoundException - if a mandatory parameter is missing.
Method Detail

getParameterDescriptors

public org.opengis.parameter.ParameterDescriptorGroup getParameterDescriptors()
Returns the parameter descriptors for this map projection. This is used for a providing a default implementation of MapProjection.getParameterValues(), as well as arguments checking.

Specified by:
getParameterDescriptors in class MapProjection
Returns:
The parameter descriptors for this math transform, or null.
See Also:
OperationMethod.getParameters()

getParameterValues

public org.opengis.parameter.ParameterValueGroup getParameterValues()
Returns the parameter values for this map projection.

Overrides:
getParameterValues in class MapProjection
Returns:
A copy of the parameter values for this map projection.
See Also:
Operation.getParameterValues()

transformNormalized

protected java.awt.geom.Point2D transformNormalized(double x,
                                                    double y,
                                                    java.awt.geom.Point2D ptDst)
                                             throws ProjectionException
Transforms the specified (λ,φ) coordinates (units in radians) and stores the result in ptDst (linear distance on a unit sphere).

Specified by:
transformNormalized in class MapProjection
Parameters:
x - The longitude of the coordinate, in radians.
y - The latitude of the coordinate, in radians.
ptDst - the specified coordinate point that stores the result of transforming ptSrc, or null. Ordinates will be in a dimensionless unit, as a linear distance on a unit sphere or ellipse.
Returns:
the coordinate point after transforming (lambda, phi) and storing the result in ptDst.
Throws:
ProjectionException - if the point can't be transformed.

inverseTransformNormalized

protected java.awt.geom.Point2D inverseTransformNormalized(double x,
                                                           double y,
                                                           java.awt.geom.Point2D ptDst)
                                                    throws ProjectionException
Transforms the specified (x,y) coordinates and stores the result in ptDst.

Specified by:
inverseTransformNormalized in class MapProjection
Parameters:
x - The easting of the coordinate, linear distance on a unit sphere or ellipse.
y - The northing of the coordinate, linear distance on a unit sphere or ellipse.
ptDst - the specified coordinate point that stores the result of transforming ptSrc, or null. Ordinates will be in radians.
Returns:
the coordinate point after transforming x, y and storing the result in ptDst.
Throws:
ProjectionException - if the point can't be transformed.

hashCode

public int hashCode()
Returns a hash value for this projection.

Overrides:
hashCode in class MapProjection

equals

public boolean equals(java.lang.Object object)
Compares the specified object with this map projection for equality.

Overrides:
equals in class MapProjection
Parameters:
object - The object to compare with this transform.
Returns:
true if the given object is a transform of the same class and if, given identical source position, the transformed position would be the equals.


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