org.geotools.ct.proj
Class Mercator

java.lang.Object
  org.geotools.ct.AbstractMathTransform
      org.geotools.ct.proj.MapProjection
          org.geotools.ct.proj.CylindricalProjection
              org.geotools.ct.proj.Mercator

All Implemented Interfaces:

MathTransform, MathTransform2D, java.io.Serializable

Deprecated. Replaced by .

public class Mercator

extends CylindricalProjection

Mercator Cylindrical Projection. The parallels and the meridians are straight lines and cross at right angles; this projection thus produces rectangular charts. The scale is true along the equator (by default) or along two parallels equidistant of the equator (if a scale factor other than 1 is used). This projection is used to represent areas close to the equator. It is also often used for maritime navigation because all the straight lines on the chart are loxodrome lines, i.e. a ship following this line would keep a constant azimuth on its compass.

This implementation handles both the 1 and 2 stardard parallel cases. For Mercator_1SP (EPSG code 9804), the line of contact is the equator. For Mercator_2SP (EPSG code 9805) lines of contact are symmetrical about the equator.

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.

Version:

$Id: Mercator.java 17672 2006-01-19 00:25:55Z desruisseaux $

Author:

Andr? Gosselin, Martin Desruisseaux, Rueben Schulz

See Also:

Mercator projection on MathWorld, "mercator_1sp" on Remote Sensing, "mercator_2sp" on Remote Sensing, Serialized Form

Field Summary

protected double

standardParallel Deprecated. Standard Parallel used for the Mercator_2SP case.

Fields inherited from class org.geotools.ct.proj.MapProjection

centralMeridian, e, es, falseEasting, falseNorthing, globalScale, isSpherical, latitudeOfOrigin, scaleFactor, semiMajor, semiMinor

Fields inherited from interface org.geotools.ct.MathTransform2D

IDENTITY

Constructor Summary

protected

Mercator(Projection parameters) Deprecated. Construct a new map projection from the supplied parameters.

Method Summary

boolean	equals(java.lang.Object object) Deprecated. Compares the specified object with this map projection for equality.
java.lang.String	getName(java.util.Locale locale) Deprecated. Returns a human readable name localized for the specified locale.
int	hashCode() Deprecated. Returns a hash value for this projection.
protected java.awt.geom.Point2D	inverseTransformNormalized(double x, double y, java.awt.geom.Point2D ptDst) Deprecated. Transforms the specified (x,y) coordinate and stores the result in ptDst.
protected java.awt.geom.Point2D	transformNormalized(double x, double y, java.awt.geom.Point2D ptDst) Deprecated. Transforms the specified (x,y) coordinate (units in radians) and stores the result in ptDst (linear distance on a unit sphere).

Methods inherited from class org.geotools.ct.proj.MapProjection

getDimSource, getDimTarget, inverse, toString, transform, transform, transform

Methods inherited from class org.geotools.ct.AbstractMathTransform

createTransformedShape, derivative, derivative, fromGeoAPI, isIdentity, transform

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.geotools.ct.MathTransform2D

createTransformedShape, derivative

Methods inherited from interface org.geotools.ct.MathTransform

derivative, isIdentity, transform

Field Detail

standardParallel

protected final double standardParallel

Deprecated.

Standard Parallel used for the Mercator_2SP case. Set to Double.NaN for the Mercator_1SP case.

Constructor Detail

Mercator

protected Mercator(Projection parameters)
            throws MissingParameterException

Deprecated.

Construct a new map projection from the supplied parameters.

Parameters:

parameters - The parameter values in standard units.

Throws:

MissingParameterException - if a mandatory parameter is missing.

Method Detail

getName

public java.lang.String getName(java.util.Locale locale)

Deprecated.

Returns a human readable name localized for the specified locale.

Specified by:

getName in class MapProjection

transformNormalized

protected java.awt.geom.Point2D transformNormalized(double x,
                                                    double y,
                                                    java.awt.geom.Point2D ptDst)
                                             throws ProjectionException

Deprecated.

Transforms the specified (x,y) coordinate (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 x, y 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

Deprecated.

Transforms the specified (x,y) coordinate 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()

Deprecated.

Returns a hash value for this projection.

Overrides:

hashCode in class MapProjection

equals

public boolean equals(java.lang.Object object)

Deprecated.

Compares the specified object with this map projection for equality.

Overrides:

equals in class MapProjection