ucar.unidata.geoloc.projection

Class UtmProjection

java.lang.Object

ucar.unidata.geoloc.projection.AbstractProjection

ucar.unidata.geoloc.projection.UtmProjection

All Implemented Interfaces:

Projection

@Immutable
public class UtmProjection
extends AbstractProjection

Universal Transverse Mercator. Ellipsoidal earth.

Origin of coordinate system is reletive to the point where the central meridian and the equator cross. This point has x,y value = (500, 0) km for north hemisphere. and (500, 10,0000) km for south hemisphere. Increasing values always go north and east.

The central meridian = (zone * 6 - 183) degrees, where zone in [1,60].

Field Summary

Fields

Modifier and Type	Field and Description
static String	GRID_MAPPING_NAME
static String	UTM_ZONE1
static String	UTM_ZONE2

Fields inherited from class ucar.unidata.geoloc.projection.AbstractProjection

atts, EARTH_RADIUS, INDEX_LAT, INDEX_LON, INDEX_X, INDEX_Y, isLatLon, name, PI, PI_OVER_2, PI_OVER_4, TOLERANCE

Constructor Summary

Constructors

Constructor and Description
UtmProjection() Constructor with default parameters
UtmProjection(double a, double f, int zone, boolean isNorth) Construct a Universal Transverse Mercator Projection.
UtmProjection(int zone, boolean isNorth) Constructor with default WGS 84 ellipsoid.

Method Summary

Modifier and Type	Method and Description
Projection	constructCopy() copy constructor - avoid clone !!
boolean	crossSeam(ProjectionPoint pt1, ProjectionPoint pt2) Does the line between these two points cross the projection "seam".
boolean	equals(Object o)
double	getCentralMeridian()
String	getProjectionTypeLabel() Get the label to be used in the gui for this type of projection
int	getZone() Get the zone number = [1,60]
int	hashCode()
boolean	isNorth() Get whether in North or South Hemisphere.
ProjectionPoint	latLonToProj(LatLonPoint latLon) Convert a LatLonPoint to projection coordinates.
String	paramsToString() Get the parameters as a String
LatLonPoint	projToLatLon(ProjectionPoint world) Convert projection coordinates to a LatLonPoint.

Methods inherited from class ucar.unidata.geoloc.projection.AbstractProjection

addParameter, addParameter, addParameter, addParameter, findProjectionParameter, getClassName, getHeader, getMinOrMaxLon, getName, getProjectionAttributes, getProjectionParameters, isLatLon, latLonToProjBB, projToLatLonBB, toString

Methods inherited from class java.lang.Object

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

Methods inherited from interface ucar.unidata.geoloc.Projection

latLonToProj, projToLatLon

Field Detail

GRID_MAPPING_NAME

public static final String GRID_MAPPING_NAME

See Also:

Constant Field Values

UTM_ZONE1

public static final String UTM_ZONE1

See Also:

Constant Field Values

UTM_ZONE2

public static final String UTM_ZONE2

See Also:

Constant Field Values

Constructor Detail

UtmProjection

public UtmProjection()

Constructor with default parameters

UtmProjection

public UtmProjection(int zone,
                     boolean isNorth)

Constructor with default WGS 84 ellipsoid.

Parameters:

zone - the UTM zone number (1-60)

isNorth - true if the UTM coordinate is in the northern hemisphere

UtmProjection

public UtmProjection(double a,
                     double f,
                     int zone,
                     boolean isNorth)

Construct a Universal Transverse Mercator Projection.

Parameters:

a - the semi-major axis (meters) for the ellipsoid

f - the inverse flattening for the ellipsoid

zone - the UTM zone number (1-60)

isNorth - true if the UTM coordinate is in the northern hemisphere

Method Detail

constructCopy

public Projection constructCopy()

Description copied from class: AbstractProjection

copy constructor - avoid clone !!

Specified by:

constructCopy in class AbstractProjection

Returns:

a copy of this Projection.

getZone

public int getZone()

Get the zone number = [1,60]

Returns:

zone number

isNorth

public boolean isNorth()

Get whether in North or South Hemisphere.

Returns:

true if north

getProjectionTypeLabel

public String getProjectionTypeLabel()

Get the label to be used in the gui for this type of projection

Overrides:

getProjectionTypeLabel in class AbstractProjection

Returns:

Type label

getCentralMeridian

public double getCentralMeridian()

paramsToString

public String paramsToString()

Get the parameters as a String

Specified by:

paramsToString in interface Projection

Specified by:

paramsToString in class AbstractProjection

Returns:

the parameters as a String

crossSeam

public boolean crossSeam(ProjectionPoint pt1,
                         ProjectionPoint pt2)

Does the line between these two points cross the projection "seam".

Parameters:

pt1 - the line goes between these two points

pt2 - the line goes between these two points

Returns:

false if there is no seam

equals

public boolean equals(Object o)

Overrides:

equals in class Object

hashCode

public int hashCode()

Overrides:

hashCode in class Object

latLonToProj

public ProjectionPoint latLonToProj(LatLonPoint latLon)

Description copied from interface: Projection

Convert a LatLonPoint to projection coordinates.

projToLatLon

public LatLonPoint projToLatLon(ProjectionPoint world)

Description copied from interface: Projection

Convert projection coordinates to a LatLonPoint.