jview
Class CylindricalEqualAreaProjection

java.lang.Object
  jview.AbstractFormattingTransform
      jview.CylindricalProjection
          jview.CylindricalEqualAreaProjection

All Implemented Interfaces:

CoordinateTransforming, DeltaFormattedTransforming, DeltaTransforming, FormattedTransforming

public class CylindricalEqualAreaProjection
extends CylindricalProjection

A cylindrical equal area projection transforms y with the sine rather than the tangent,

   x = confine360(λ-λ_0+180.)/360.
   y = 0.5*(1.-sin(φ))
   

Note that scaling factors stemming from standard parallel vaporize in normalized coordinates.

Field Summary

Fields inherited from class jview.CylindricalProjection

lambda0, TOPLATITUDE

Constructor Summary

CylindricalEqualAreaProjection()
Construct a new CylindricalEqualAreaProjection for Greenwhich.

CylindricalEqualAreaProjection(double l0)
Construct a new CylindricalEqualAreaProjection for Greenwhich.

Method Summary

protected double	getPhi(Point2D norm) Inversion formular is asin(2y-1)
protected double	getY(VectorG lamphi) We calculate y from

Methods inherited from class jview.CylindricalProjection

deduceFormat, estimateX, estimateY, getLambda, getScale, getX, setSexagesimal, toNormalizedDistance, toNormalizedSpace, toUserDistance, toUserSpace

Methods inherited from class jview.AbstractFormattingTransform

deltaFormatUserSpaceX, deltaFormatUserSpaceY, formatUserCoordinates, formatUserSpaceX, formatUserSpaceY, getFormatUserX, getFormatUserY, setDeltaFormatUserX, setDeltaFormatUserY, setFormatUserX, setFormatUserY, useEstimatedFormats

Methods inherited from class java.lang.Object

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

Constructor Detail

CylindricalEqualAreaProjection

public CylindricalEqualAreaProjection()

Construct a new CylindricalEqualAreaProjection for Greenwhich.

CylindricalEqualAreaProjection

public CylindricalEqualAreaProjection(double l0)

Construct a new CylindricalEqualAreaProjection for Greenwhich.

Method Detail

getY

protected double getY(VectorG lamphi)

We calculate y from

       y = 0.5*(1.-sin(φ))
       

Overrides:

getY in class CylindricalProjection

getPhi

protected double getPhi(Point2D norm)

Inversion formular is asin(2y-1)

Overrides:

getPhi in class CylindricalProjection