org.deegree.crs.projections.conic
Class ConicProjection

java.lang.Object
  org.deegree.crs.CRSIdentifiable
      org.deegree.crs.projections.Projection
          org.deegree.crs.projections.conic.ConicProjection

Direct Known Subclasses:

LambertConformalConic

public abstract class ConicProjection
extends Projection

The ConicProjection is a super class for all conic projections.

(From Snyder p.97)

To show a region for which the greatest extent is from east to west in the temperate zones, conic projections are usually preferable to cylindrical projections.

Normal conic projections are distinguished by the use of arcs of concentric circles for parallesl of latitude and equally spaced straight radii of these circles for meridians. The angles between the meridians on the map are smaller than the actual differences in longitude. The circular arcs may or may not be equally spaced, depending on the projections. The polyconic projections and the oblique conic projections have characteristcs different from these.

There are three important classes of conic projections:

• The equidistant
• the conformal
• the equal area

Version:

$Revision: 18171 $, $Date: 2009-06-17 16:00:07 +0200 (Mi, 17 Jun 2009) $

Author:

Rutger Bezema, last edited by: $Author: mschneider $

Constructor Summary

ConicProjection(double firstParallelLatitude, double secondParallelLatitude, GeographicCRS geographicCRS, double falseNorthing, double falseEasting, javax.vecmath.Point2d naturalOrigin, Unit units, double scale, boolean conformal, boolean equalArea, CRSIdentifiable id)

Method Summary

boolean	equals(Object other)
double	getFirstParallelLatitude()
double	getSecondParallelLatitude()
int	hashCode() Implementation as proposed by Joshua Block in Effective Java (Addison-Wesley 2001), which supplies an even distribution and is relatively fast.

Methods inherited from class org.deegree.crs.projections.Projection

clone, doInverseProjection, doProjection, getCosphi0, getDatum, getEccentricity, getEllipsoid, getFalseEasting, getFalseNorthing, getGeographicCRS, getImplementationName, getNaturalOrigin, getPrimeMeridian, getProjectionLatitude, getProjectionLongitude, getScale, getScaleFactor, getSemiMajorAxis, getSemiMinorAxis, getSinphi0, getSquaredEccentricity, getUnits, isConformal, isEqualArea, isSpherical, setFalseEasting, setScale, toString

Methods inherited from class org.deegree.crs.CRSIdentifiable

addAreaOfUse, addName, checkForNullObject, checkForNullObject, checkForNullObject, getAreaOfUse, getAreaOfUseBBox, getAreasOfUse, getCode, getCodeAndName, getCodes, getDescription, getDescriptions, getName, getNames, getOrignalCodeStrings, getVersion, getVersions, hasCode, hasId, hasIdOrName, setDefaultAreaOfUse, setDefaultDescription, setDefaultId, setDefaultName, setDefaultVersion

Methods inherited from class java.lang.Object

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

Constructor Detail

ConicProjection

public ConicProjection(double firstParallelLatitude,
                       double secondParallelLatitude,
                       GeographicCRS geographicCRS,
                       double falseNorthing,
                       double falseEasting,
                       javax.vecmath.Point2d naturalOrigin,
                       Unit units,
                       double scale,
                       boolean conformal,
                       boolean equalArea,
                       CRSIdentifiable id)

Parameters:

firstParallelLatitude - the latitude (in radians) of the first parallel. (Snyder phi_1).

secondParallelLatitude - the latitude (in radians) of the second parallel. (Snyder phi_2).

geographicCRS -

falseNorthing -

falseEasting -

naturalOrigin -

units -

scale -

conformal -

equalArea -

id - an identifiable instance containing information about this projection

Method Detail

getFirstParallelLatitude

public final double getFirstParallelLatitude()

Returns:

the latitude of the first parallel which is the intersection of the earth with the cone or the projectionLatitude if the cone is tangential with earth (e.g. one standard parallel).

getSecondParallelLatitude

public final double getSecondParallelLatitude()

Returns:

the latitude of the first parallel which is the intersection of the earth with the cone or the projectionLatitude if the cone is tangential with earth (e.g. one standard parallel).

equals

public boolean equals(Object other)

Overrides:

equals in class Projection

hashCode

public int hashCode()

Implementation as proposed by Joshua Block in Effective Java (Addison-Wesley 2001), which supplies an even distribution and is relatively fast. It is created from field f as follows:

• boolean -- code = (f ? 0 : 1)
• byte, char, short, int -- code = (int)f
• long -- code = (int)(f ^ (f >>>32))
• float -- code = Float.floatToIntBits(f);
• double -- long l = Double.doubleToLongBits(f); code = (int)(l ^ (l >>> 32))
• all Objects, (where equals( ) calls equals( ) for this field) -- code = f.hashCode( )
• Array -- Apply above rules to each element

Combining the hash code(s) computed above: result = 37 * result + code;

Overrides:

hashCode in class Projection

Returns:

(int) ( result >>> 32 ) ^ (int) result;

See Also:

Object.hashCode()