com.partnersoft.geometry.projection

Class TransverseMercator

java.lang.Object

com.partnersoft.geometry.projection.Projection

com.partnersoft.geometry.projection.StandardProjection

com.partnersoft.geometry.projection.TransverseMercator

All Implemented Interfaces:

Coggable, ProjectionConstants

Direct Known Subclasses:

UTM

public class TransverseMercator
extends StandardProjection

Copyright 2004 Partner Software, Inc.

Author:

Paul Reavis, Russell Cagle

Field Summary

Fields inherited from class com.partnersoft.geometry.projection.StandardProjection

a, b, datum, e, ellipsoid, es, esp, initialized, lam0, NAD27, NAD83, originLatitude, originLongitude, originX, originY, phi0

Fields inherited from interface com.partnersoft.geometry.projection.ProjectionConstants

ATOL, DEG2RAD, EPSILON, FOURTHPI, HALFPI, INTERNATIONAL_FEET_TO_METERS, METERS_TO_INTERNATIONAL_FEET, METERS_TO_US_SURVEY_FEET, NULL_PROJECTION, ONE_TOL, PI, RAD2DEG, TOL, TWOPI, US_SURVEY_FEET_TO_METERS

Constructor Summary

Constructors

Constructor and Description
TransverseMercator()
TransverseMercator(Cog newState)

Method Summary

Methods

Modifier and Type	Method and Description
protected double	forwardM(double phi, double sphi, double cphi, double[] inCoefficients) Utility functions for calculating M in forward direction.
protected double[]	getCoefficients(double es) Calculate the series expansion.
double	getScaleReduction() Scale reduction (?)
protected void	initializeImp()
void	project(Point point) Project from latlong to xy.
void	reverse(Point point) Reverse project from xy to latlong.
protected double	reverseM(double arg, double es, double[] inCoefficients) Utility function for calculating M in the reverse direction.
void	setScaleReduction(double newScaleReduction) Scale reduction (?)
Cog	toCog() Returns the complete internal state of this object in the form of a Cog.

Methods inherited from class com.partnersoft.geometry.projection.StandardProjection

aacos, aasin, aatan2, abs, asin, asqrt, atan, atan2, cos, getDatum, getEllipsoid, getOriginLatitude, getOriginLongitude, getOriginX, getOriginY, gpsToProjection, hypot, initialize, log, pj_enfn, pj_msfn, pj_phi2, pj_qsfn, pj_tsfn, pow, projectionToGPS, setDatum, setEllipsoid, setOriginLatitude, setOriginLongitude, setOriginX, setOriginY, sin, sqrt, tan, toDegrees, toRadians

Methods inherited from class com.partnersoft.geometry.projection.Projection

getName, project, project, project, project, projectFeet, projectFeet, projectFeet, projectFeet, projectFeet, reverse, reverse, reverse, reverse, reverseFeet, reverseFeet, reverseFeet, reverseFeet, reverseFeet, setName

Methods inherited from class java.lang.Object

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

Constructor Detail

TransverseMercator

public TransverseMercator()

TransverseMercator

public TransverseMercator(Cog newState)

Method Detail

project

public void project(Point point)

Description copied from class: Projection

Project from latlong to xy. Modifies the input Point. Remember that Point.x is longitude, Point.y is latitude.

Specified by:

project in class Projection

reverse

public void reverse(Point point)

Description copied from class: Projection

Reverse project from xy to latlong. Results are returned with point.x = long, point.y = lat. Modifies input.

Specified by:

reverse in class Projection

getCoefficients

protected double[] getCoefficients(double es)

Calculate the series expansion. eSquared = (a^2-b^2)/(a^2) where a and b are the major and minor axes of the ellipsoid in question.

forwardM

protected double forwardM(double phi,
              double sphi,
              double cphi,
              double[] inCoefficients)

Utility functions for calculating M in forward direction. meridinal distance for ellipsoid and inverse 8th degree - accurate to < 1e-5 meters when used in conjuction with typical major axis values.

reverseM

protected double reverseM(double arg,
              double es,
              double[] inCoefficients)

Utility function for calculating M in the reverse direction. This is an itterative approach that rairly goes beyond 2 itterations, However it is designed to break at MAX_ITERATIONS and return the best guess at that point. Inverse determines phi to EPS (1e-11) radians, about 1e-6 seconds.

initializeImp

protected void initializeImp()

Specified by:

initializeImp in class StandardProjection

getScaleReduction

public double getScaleReduction()

Scale reduction (?)

setScaleReduction

public void setScaleReduction(double newScaleReduction)

Scale reduction (?)

toCog

public Cog toCog()

Description copied from interface: Coggable

Returns the complete internal state of this object in the form of a Cog.

Specified by:

toCog in interface Coggable

Overrides:

toCog in class StandardProjection

Returns:

Cog representing the internal state of this object