ucar.unidata.geoloc.projection

Class RotatedLatLon

java.lang.Object

ucar.unidata.geoloc.ProjectionImpl

ucar.unidata.geoloc.projection.RotatedLatLon

All Implemented Interfaces:

Serializable, Projection

public class RotatedLatLon
extends ProjectionImpl

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

See Also:

Serialized Form

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

Method Summary

Modifier and Type	Method and 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.
int	hashCode()
ProjectionPoint	latLonToProj(LatLonPoint latlon, ProjectionPointImpl destPoint) Transform a "real" longitude and latitude into the rotated longitude (X) and rotated latitude (Y).
static void	main(String[] args)
String	paramsToString() returns constructor params as a String
LatLonPoint	projToLatLon(ProjectionPoint ppt, LatLonPointImpl destPoint) Transform a rotated longitude (X) and rotated latitude (Y) into a "real" longitude-latitude pair.

Methods inherited from class ucar.unidata.geoloc.ProjectionImpl

addParameter, addParameter, addParameter, findProjectionParameter, getClassName, getDefaultMapArea, getDefaultMapAreaLL, getHeader, getName, getProjectionParameters, getProjectionTypeLabel, isLatLon, latLonToProj, latLonToProj, latLonToProj, latLonToProj, latLonToProj, latLonToProj, latLonToProj, latLonToProj, latLonToProj, latLonToProj, latLonToProjBB, projToLatLon, projToLatLon, projToLatLon, projToLatLon, projToLatLon, projToLatLon, projToLatLonBB, projToLatLonBBold, setDefaultMapArea, setName, toString

Methods inherited from class java.lang.Object

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

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

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

paramsToString

public String paramsToString()

returns constructor params as a String

Specified by:

paramsToString in interface Projection

Specified by:

paramsToString in class ProjectionImpl

Returns:

String

latLonToProj

public ProjectionPoint latLonToProj(LatLonPoint latlon,
                                    ProjectionPointImpl destPoint)

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

Specified by:

latLonToProj in interface Projection

Specified by:

latLonToProj in class ProjectionImpl

Parameters:

latlon - convert from these lat, lon coordinates

destPoint - the object to write to

Returns:

the given destPoint

projToLatLon

public LatLonPoint projToLatLon(ProjectionPoint ppt,
                                LatLonPointImpl destPoint)

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

Specified by:

projToLatLon in interface Projection

Specified by:

projToLatLon in class ProjectionImpl

Parameters:

ppt - convert from these projection coordinates

destPoint - the object to write to

Returns:

LatLonPoint convert to these lat/lon coordinates

crossSeam

public boolean crossSeam(ProjectionPoint pt1,
                         ProjectionPoint pt2)

Description copied from class: ProjectionImpl

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

main

public static void main(String[] args)