org.geotools.referencing.operation.projection
Class LambertConformal

Object
  Formattable
      AbstractMathTransform
          MapProjection
              LambertConformal

All Implemented Interfaces:

Serializable, MathTransform, MathTransform2D

Direct Known Subclasses:

LambertConformal1SP, LambertConformal2SP, LambertConformalBelgium, LambertConformalESRI

public abstract class LambertConformal
extends MapProjection

Lambert Conical Conformal Projection. Areas and shapes are deformed as one moves away from standard parallels. The angles are true in a limited area. This projection is used for the charts of North America.

This implementation provides transforms for three cases of the lambert conic conformal projection:

• Lambert_Conformal_Conic_1SP (EPSG code 9801)
• Lambert_Conformal_Conic_2SP (EPSG code 9802)
• Lambert_Conic_Conformal_2SP_Belgium (EPSG code 9803)
• Lambert_Conformal_Conic - An alias for the ESRI 2SP case that includes a scale_factor parameter

For the 1SP case the latitude of origin is used as the standard parallel (SP). To use 1SP with a latitude of origin different from the SP, use the 2SP and set the SP1 to the single SP. The standard_parallel_2" parameter is optional and will be given the same value as "standard_parallel_1" if not set (creating a 1 standard parallel projection).

References:

• John P. Snyder (Map Projections - A Working Manual,
  U.S. Geological Survey Professional Paper 1395, 1987)
• "Coordinate Conversions and Transformations including Formulas",
  EPSG Guidence Note Number 7, Version 19.

Since:

2.1

Author:

André Gosselin, Martin Desruisseaux (PMO, IRD), Rueben Schulz

See Also:

Lambert conformal conic projection on MathWorld, lambert_conic_conformal_1sp, lambert_conic_conformal_2sp, lambert_conic_conformal_2sp_belgium, Serialized Form

Module:

trunk/modules/library (gt-library.jar) (Maven report) (SVN head)

Nested Class Summary

Nested classes/interfaces inherited from class MapProjection

MapProjection.AbstractProvider

Field Summary

Fields inherited from class MapProjection

centralMeridian, excentricity, excentricitySquared, falseEasting, falseNorthing, globalScale, isSpherical, latitudeOfOrigin, LOGGER, scaleFactor, semiMajor, semiMinor

Fields inherited from class Formattable

SINGLE_LINE

Constructor Summary

protected

LambertConformal(ParameterValueGroup parameters) Constructs a new map projection from the supplied parameters.

Method Summary

boolean	equals(Object object) Compares the specified object with this map projection for equality.
ParameterValueGroup	getParameterValues() Returns the parameter values for this map projection.
int	hashCode() Returns a hash value for this projection.
protected Point2D	inverseTransformNormalized(double x, double y, Point2D ptDst) Transforms the specified (x,y) coordinates and stores the result in ptDst.
protected Point2D	transformNormalized(double x, double y, 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 MapProjection

getParameterDescriptors, getSourceDimensions, getTargetDimensions, getToleranceForAssertions, inverse, resetWarnings, transform, transform, transform

Methods inherited from class AbstractMathTransform

createTransformedShape, derivative, derivative, ensureNonNull, formatWKT, getName, isIdentity, needCopy, rollLongitude, transform, transform, transform

Methods inherited from class Formattable

toString, toWKT, toWKT, toWKT

Methods inherited from class Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface MathTransform2D

createTransformedShape, derivative

Methods inherited from interface MathTransform

derivative, isIdentity, toWKT, transform, transform, transform

Constructor Detail

LambertConformal

protected LambertConformal(ParameterValueGroup parameters)
                    throws ParameterNotFoundException

Constructs a new map projection from the supplied parameters.

Parameters:

parameters - The parameter values in standard units.

Throws:

ParameterNotFoundException - if a mandatory parameter is missing.

Method Detail

getParameterValues

public 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 Point2D transformNormalized(double x,
                                      double y,
                                      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 Point2D inverseTransformNormalized(double x,
                                             double y,
                                             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(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.