Package ucar.unidata.geoloc.projection

Class UtmProjection

java.lang.Object

ucar.unidata.geoloc.ProjectionImpl

ucar.unidata.geoloc.projection.UtmProjection

All Implemented Interfaces:

Serializable, Projection

public class UtmProjection
extends ProjectionImpl

Universal Transverse Mercator. Ellipsoidal earth.

Origin of coordinate system is relative 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].

See Also:

Serialized Form

Field Summary

Fields

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

Fields inherited from class ucar.unidata.geoloc.ProjectionImpl

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

Constructor Summary

Constructors

Constructor	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	Description
ProjectionImpl	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)	Returns true if this represents the same Projection as proj.
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.
double[][]	latLonToProj(double[][] from, double[][] to, int latIndex, int lonIndex)	Convert lat/lon coordinates to projection coordinates.
float[][]	latLonToProj(float[][] from, float[][] to, int latIndex, int lonIndex)	Convert lat/lon coordinates to projection coordinates.
ProjectionPoint	latLonToProj(LatLonPoint latLon, ProjectionPointImpl result)	Convert a LatLonPoint to projection coordinates
String	paramsToString()	Get the parameters as a String
double[][]	projToLatLon(double[][] from, double[][] to)	Convert projection coordinates to lat/lon coordinate.
float[][]	projToLatLon(float[][] from, float[][] to)	Convert projection coordinates to lat/lon coordinate.
LatLonPoint	projToLatLon(ProjectionPoint world, LatLonPointImpl result)	Convert projection coordinates to a LatLonPoint Note: a new object is not created on each call for the return value.

Methods inherited from class ucar.unidata.geoloc.ProjectionImpl

addParameter, addParameter, addParameter, findProjectionParameter, getClassName, getDefaultMapArea, getDefaultMapAreaLL, getHeader, getName, getProjectionParameters, isLatLon, latLonToProj, latLonToProj, latLonToProj, latLonToProj, latLonToProj, latLonToProj, latLonToProj, latLonToProjBB, projToLatLon, projToLatLon, projToLatLon, projToLatLonBB, projToLatLonBBold, setDefaultMapArea, setName, 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 ProjectionImpl constructCopy()

Description copied from class: ProjectionImpl

copy constructor - avoid clone !!

Specified by:

constructCopy in class ProjectionImpl

Returns:

a copy of this Projection. TODO return Projection in ver6

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 ProjectionImpl

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 ProjectionImpl

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".

Specified by:

crossSeam in interface Projection

Specified by:

crossSeam in class ProjectionImpl

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)

Description copied from class: ProjectionImpl

Returns true if this represents the same Projection as proj.

Specified by:

equals in interface Projection

Specified by:

equals in class ProjectionImpl

Parameters:

o - projection in question

Returns:

true if this represents the same Projection as proj.

hashCode

public int hashCode()

Overrides:

hashCode in class Object

latLonToProj

public ProjectionPoint latLonToProj(LatLonPoint latLon,
                                    ProjectionPointImpl result)

Convert a LatLonPoint to projection coordinates

Specified by:

latLonToProj in interface Projection

Specified by:

latLonToProj in class ProjectionImpl

Parameters:

latLon - convert from these lat, lon coordinates

result - the object to write to

Returns:

the given result

latLonToProj

public double[][] latLonToProj(double[][] from,
                               double[][] to,
                               int latIndex,
                               int lonIndex)

Description copied from class: ProjectionImpl

Convert lat/lon coordinates to projection coordinates.

Overrides:

latLonToProj in class ProjectionImpl

Parameters:

from - array of lat/lon coordinates: from[2][n], where (from[latIndex][i], from[lonIndex][i]) is the (lat,lon) coordinate of the ith point

to - resulting array of projection coordinates: to[2][n] where (to[0][i], to[1][i]) is the (x,y) coordinate of the ith point

latIndex - index of lat coordinate; must be 0 or 1

lonIndex - index of lon coordinate; must be 0 or 1

Returns:

the "to" array

latLonToProj

public float[][] latLonToProj(float[][] from,
                              float[][] to,
                              int latIndex,
                              int lonIndex)

Description copied from class: ProjectionImpl

Convert lat/lon coordinates to projection coordinates.

Overrides:

latLonToProj in class ProjectionImpl

Parameters:

from - array of lat/lon coordinates: from[2][n], where (from[latIndex][i], from[lonIndex][i]) is the (lat,lon) coordinate of the ith point

to - resulting array of projection coordinates: to[2][n] where (to[0][i], to[1][i]) is the (x,y) coordinate of the ith point

latIndex - index of lat coordinate; must be 0 or 1

lonIndex - index of lon coordinate; must be 0 or 1

Returns:

the "to" array

projToLatLon

public LatLonPoint projToLatLon(ProjectionPoint world,
                                LatLonPointImpl result)

Convert projection coordinates to a LatLonPoint Note: a new object is not created on each call for the return value.

Specified by:

projToLatLon in interface Projection

Specified by:

projToLatLon in class ProjectionImpl

Parameters:

world - convert from these projection coordinates

result - the object to write to

Returns:

LatLonPoint convert to these lat/lon coordinates

projToLatLon

public float[][] projToLatLon(float[][] from,
                              float[][] to)

Convert projection coordinates to lat/lon coordinate.

Overrides:

projToLatLon in class ProjectionImpl

Parameters:

from - array of projection coordinates: from[2][n], where (from[0][i], from[1][i]) is the (x, y) coordinate of the ith point

to - resulting array of lat/lon coordinates: to[2][n] where (to[0][i], to[1][i]) is the (lat, lon) coordinate of the ith point

Returns:

the "to" array

projToLatLon

public double[][] projToLatLon(double[][] from,
                               double[][] to)

Description copied from class: ProjectionImpl

Convert projection coordinates to lat/lon coordinate.

Overrides:

projToLatLon in class ProjectionImpl

Parameters:

from - array of projection coordinates: from[2][n], where (from[0][i], from[1][i]) is the (x, y) coordinate of the ith point

to - resulting array of lat/lon coordinates: to[2][n] where (to[0][i], to[1][i]) is the (lat, lon) coordinate of the ith point

Returns:

the "to" array