mccombe.mapping
Class IrishGrid

java.lang.Object
  mccombe.mapping.CoordinateSystem
      mccombe.mapping.Projection
          mccombe.mapping.TransverseMercator
              mccombe.mapping.IrishGrid

public class IrishGrid
extends TransverseMercator

Implementation of the Irish Grid. Note that this is used throughout the island of Ireland, North and South and that the OSGB grid is not applicable. For a complete description of the Irish Grid, see http://www.osni.gov.uk/2.1_the_irish_grid.pdf

Field Summary

Fields inherited from class mccombe.mapping.TransverseMercator

northernHemisphere, zone

Fields inherited from class mccombe.mapping.CoordinateSystem

locus, ref, sph

Constructor Summary

IrishGrid(ENPair point)
Create a new IrishGrid point for a specific pair of Eastings and Northings.

IrishGrid(ENPair point, Ellipsoid e, Datum d)
Create a new IrishGrid point for a specific pair of Eastings and Northings, Ellipsoid and Datum.

IrishGrid(Position p, Ellipsoid e, Datum d)
Create a new IrishGrid point for a specific Position, Ellipsoid and Datum.

Method Summary

Datum	defaultDatum() Defines the default Datum for this system
Ellipsoid	defaultEllipsoid() Define the default Ellipsoid for this system
double	e0() False Eastimg (metres)
double	f0() Define scale factor
double	lamda0() The central meridian
static IrishGrid	makePoint(java.lang.String gridref, Ellipsoid e, Datum d) Factory method to create a new IrishGrid point using a String containing a grid reference.
double	n0() Define false northing
double	phi0() Define latitude of true origin
java.lang.String	toString() Provide a String representation for this IrishGrid
protected static boolean	validateEN(ENPair p)

Methods inherited from class mccombe.mapping.TransverseMercator

gridConvergence, pointScaleFactor, toEN

Methods inherited from class mccombe.mapping.CoordinateSystem

getDatum, getEllipsoid, getName, getPosition, getWGS84, parseDouble, toLatLong, toLatLongString

Methods inherited from class java.lang.Object

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

Constructor Detail

IrishGrid

public IrishGrid(Position p,
                 Ellipsoid e,
                 Datum d)

Create a new IrishGrid point for a specific Position, Ellipsoid and Datum.

Parameters:

p - Position

e - Ellipsoid to use with this instance

d - Datum to use

IrishGrid

public IrishGrid(ENPair point,
                 Ellipsoid e,
                 Datum d)

Create a new IrishGrid point for a specific pair of Eastings and Northings, Ellipsoid and Datum.

Parameters:

point - ENPair containing the easting and northing values

e - Ellipsoid to use with this instance

d - Datum to use

IrishGrid

public IrishGrid(ENPair point)

Create a new IrishGrid point for a specific pair of Eastings and Northings. Default values of Ellipsoid and Datum are used.

Parameters:

point - ENPair containing the easting and northing values

Method Detail

makePoint

public static IrishGrid makePoint(java.lang.String gridref,
                                  Ellipsoid e,
                                  Datum d)
                           throws GridFormatException

Factory method to create a new IrishGrid point using a String containing a grid reference.

Parameters:

gridref - A valid Irish grid reference String (e.g. R 212 712)

e - Ellipsoid to use

d - Datum to use

Returns:

A new IrishGrid point for the specified point, Ellipsoid and Datum

Throws:

GridFormatException - In case of syntax error in he grid reference

defaultDatum

public Datum defaultDatum()

Defines the default Datum for this system

Specified by:

defaultDatum in class CoordinateSystem

Returns:

Datum.Ireland_1965

defaultEllipsoid

public Ellipsoid defaultEllipsoid()

Define the default Ellipsoid for this system

Specified by:

defaultEllipsoid in class CoordinateSystem

Returns:

Ellipsoid.MODIFIED_AIRY

toString

public java.lang.String toString()

Provide a String representation for this IrishGrid

Specified by:

toString in class CoordinateSystem

Returns:

A 10-figure Irish grid reference, with grid letter (e.g. R 21235 71262)

lamda0

public double lamda0()

The central meridian

Specified by:

lamda0 in class TransverseMercator

Returns:

The central meridian (degrees)

e0

public double e0()

False Eastimg (metres)

Specified by:

e0 in class TransverseMercator

Returns:

False easting value (metres)

n0

public double n0()

Define false northing

Specified by:

n0 in class TransverseMercator

Returns:

False northing value (metres)

phi0

public double phi0()

Define latitude of true origin

Specified by:

phi0 in class TransverseMercator

Returns:

Latitude of true origin (degrees)

f0

public double f0()

Define scale factor

Specified by:

f0 in class TransverseMercator

Returns:

Scale factor at central meridian

validateEN

protected static boolean validateEN(ENPair p)