ucar.unidata.geoloc.projection

Class RotatedLatLon

java.lang.Object

ucar.unidata.geoloc.projection.AbstractProjection

ucar.unidata.geoloc.projection.RotatedLatLon

All Implemented Interfaces:

Projection

public class RotatedLatLon
extends AbstractProjection

Grib 1 projection 10 and Grib 2 projection 1. The Rotated Latitude Longitude projection algorithms that are coded here were given by Tor Christian Bekkvik . The rotated lat/lon projection coordinates are defined in the grid file that need to be converted back to unrotated lat/lon projection coordinates before they can be displayed. The X/Y axis only makes sense in the rotated projection.

Since:

Nov 11, 2008

Field Summary

Fields

Modifier and Type	Field and Description
static String	GRID_MAPPING_NAME
static String	GRID_SOUTH_POLE_ANGLE
static String	GRID_SOUTH_POLE_LATITUDE
static String	GRID_SOUTH_POLE_LONGITUDE

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
RotatedLatLon() Default Constructor, needed for beans.
RotatedLatLon(double southPoleLat, double southPoleLon, double southPoleAngle) Constructor.

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", which is a discontinuity in the function latlon <-> projection plane
boolean	equals(Object o)
double	getLonPole()
double	getPoleRotate()
double	getSinDlat()
int	hashCode()
ProjectionPoint	latLonToProj(LatLonPoint latlon) Transform a "real" longitude and latitude into the rotated longitude (X) and rotated latitude (Y).
String	paramsToString() String representation of the projection parameters.
LatLonPoint	projToLatLon(ProjectionPoint ppt) Transform a rotated longitude (X) and rotated latitude (Y) into a "real" longitude-latitude pair.

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

addParameter, addParameter, addParameter, addParameter, findProjectionParameter, getClassName, getHeader, getMinOrMaxLon, getName, getProjectionAttributes, getProjectionParameters, getProjectionTypeLabel, 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

GRID_SOUTH_POLE_LONGITUDE

public static final String GRID_SOUTH_POLE_LONGITUDE

See Also:

Constant Field Values

GRID_SOUTH_POLE_LATITUDE

public static final String GRID_SOUTH_POLE_LATITUDE

See Also:

Constant Field Values

GRID_SOUTH_POLE_ANGLE

public static final String GRID_SOUTH_POLE_ANGLE

See Also:

Constant Field Values

Constructor Detail

RotatedLatLon

public RotatedLatLon()

Default Constructor, needed for beans.

RotatedLatLon

public RotatedLatLon(double southPoleLat,
                     double southPoleLon,
                     double southPoleAngle)

Constructor.

Parameters:

southPoleLat - in degrees

southPoleLon - in degrees

southPoleAngle - in degrees

Method Detail

getLonPole

public double getLonPole()

getPoleRotate

public double getPoleRotate()

getSinDlat

public double getSinDlat()

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.

paramsToString

public String paramsToString()

Description copied from interface: Projection

String representation of the projection parameters.

Specified by:

paramsToString in interface Projection

Specified by:

paramsToString in class AbstractProjection

latLonToProj

public ProjectionPoint latLonToProj(LatLonPoint latlon)

Transform a "real" longitude and latitude into the rotated longitude (X) and rotated latitude (Y).

projToLatLon

public LatLonPoint projToLatLon(ProjectionPoint ppt)

Transform a rotated longitude (X) and rotated latitude (Y) into a "real" longitude-latitude pair.

crossSeam

public boolean crossSeam(ProjectionPoint pt1,
                         ProjectionPoint pt2)

Description copied from interface: Projection

Does the line between these two points cross the projection "seam", which is a discontinuity in the function latlon <-> projection plane

Parameters:

pt1 - the line goes between these two points

pt2 - the line goes between these two points

Returns:

false if there is no seam, or the line does not cross it.

equals

public boolean equals(Object o)

Overrides:

equals in class Object

hashCode

public int hashCode()

Overrides:

hashCode in class Object