ucar.unidata.geoloc.projection
Class LambertAzimuthalEqualArea

java.lang.Object
  ucar.unidata.geoloc.ProjectionImpl
      ucar.unidata.geoloc.projection.LambertAzimuthalEqualArea

All Implemented Interfaces:

java.io.Serializable, java.lang.Cloneable, Projection

public class LambertAzimuthalEqualArea
extends ProjectionImpl

Lambert AzimuthalEqualArea Projection spherical earth.

See John Snyder, Map Projections used by the USGS, Bulletin 1532, 2nd edition (1983), p 184

Author:

Unidata Development Team

See Also:

Projection, ProjectionImpl, Serialized Form

Field Summary

Fields inherited from class ucar.unidata.geoloc.ProjectionImpl

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

Constructor Summary

LambertAzimuthalEqualArea()
Constructor with default parameters

LambertAzimuthalEqualArea(double lat0, double lon0)
Construct a LambertAzimuthalEqualArea Projection.

LambertAzimuthalEqualArea(double lat0, double lon0, double false_easting, double false_northing, double earthRadius)
Construct a LambertAzimuthalEqualArea Projection.

Method Summary

java.lang.Object	clone() Clone this projection.
ProjectionImpl	constructCopy() copy constructor - avoid clone !!
boolean	crossSeam(ProjectionPoint pt1, ProjectionPoint pt2) This returns true when the line between pt1 and pt2 crosses the seam.
boolean	equals(java.lang.Object proj) Check for equality with the Object in question
double	getFalseEasting() Get the false easting, in km.
double	getFalseNorthing() Get the false northing, in km.
double	getOriginLat() Get the origin latitude.
double	getOriginLon() Get the origin longitude.
java.lang.String	getProjectionTypeLabel() Get the label to be used in the gui for this type of projection
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
static void	main(java.lang.String[] args) Test
java.lang.String	paramsToString() Create a String of the parameters.
double[][]	projToLatLon(double[][] from, double[][] to) Convert lat/lon coordinates to projection coordinates.
float[][]	projToLatLon(float[][] from, float[][] to) Convert lat/lon coordinates to projection coordinates.
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.
void	setFalseEasting(double falseEasting) Set the false_easting, in km.
void	setFalseNorthing(double falseNorthing) Set the false northing, in km.
void	setOriginLat(double lat) Set the origin latitude.
void	setOriginLon(double lon) Set the origin longitude.

Methods inherited from class ucar.unidata.geoloc.ProjectionImpl

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

Methods inherited from class java.lang.Object

finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

LambertAzimuthalEqualArea

public LambertAzimuthalEqualArea()

Constructor with default parameters

LambertAzimuthalEqualArea

public LambertAzimuthalEqualArea(double lat0,
                                 double lon0)

Construct a LambertAzimuthalEqualArea Projection.

Parameters:

lat0 - lat origin of the coord system on the projection plane

lon0 - lon origin of the coord system on the projection plane

Throws:

java.lang.IllegalArgumentException

LambertAzimuthalEqualArea

public LambertAzimuthalEqualArea(double lat0,
                                 double lon0,
                                 double false_easting,
                                 double false_northing,
                                 double earthRadius)

Construct a LambertAzimuthalEqualArea Projection.

Parameters:

lat0 - lat origin of the coord system on the projection plane

lon0 - lon origin of the coord system on the projection plane

false_easting - natural_x_coordinate + false_easting = x coordinate in km

false_northing - natural_y_coordinate + false_northing = y coordinate in km

earthRadius - radius of the earth in km

Throws:

java.lang.IllegalArgumentException - if lat0, par1, par2 = +/-90 deg

Method Detail

constructCopy

public ProjectionImpl constructCopy()

copy constructor - avoid clone !!

Specified by:

constructCopy in class ProjectionImpl

Returns:

a copy of this Projection

clone

public java.lang.Object clone()

Clone this projection.

Overrides:

clone in class ProjectionImpl

Returns:

Clone of this

equals

public boolean equals(java.lang.Object proj)

Check for equality with the Object in question

Specified by:

equals in interface Projection

Specified by:

equals in class ProjectionImpl

Parameters:

proj - object to check

Returns:

true if they are equal

getOriginLon

public double getOriginLon()

Get the origin longitude.

Returns:

the origin longitude.

setOriginLon

public void setOriginLon(double lon)

Set the origin longitude.

Parameters:

lon - the origin longitude.

getOriginLat

public double getOriginLat()

Get the origin latitude.

Returns:

the origin latitude.

setOriginLat

public void setOriginLat(double lat)

Set the origin latitude.

Parameters:

lat - the origin latitude.

getFalseEasting

public double getFalseEasting()

Get the false easting, in km.

Returns:

the false easting.

setFalseEasting

public void setFalseEasting(double falseEasting)

Set the false_easting, in km. natural_x_coordinate + false_easting = x coordinate

Parameters:

falseEasting - x offset

getFalseNorthing

public double getFalseNorthing()

Get the false northing, in km.

Returns:

the false northing.

setFalseNorthing

public void setFalseNorthing(double falseNorthing)

Set the false northing, in km. natural_y_coordinate + false_northing = y coordinate

Parameters:

falseNorthing - y offset

getProjectionTypeLabel

public java.lang.String getProjectionTypeLabel()

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

Overrides:

getProjectionTypeLabel in class ProjectionImpl

Returns:

Type label

paramsToString

public java.lang.String paramsToString()

Create a String of the parameters.

Specified by:

paramsToString in interface Projection

Specified by:

paramsToString in class ProjectionImpl

Returns:

a String of the parameters

crossSeam

public boolean crossSeam(ProjectionPoint pt1,
                         ProjectionPoint pt2)

This returns true when the line between pt1 and pt2 crosses the seam. When the cone is flattened, the "seam" is lon0 +- 180.

Specified by:

crossSeam in interface Projection

Specified by:

crossSeam in class ProjectionImpl

Parameters:

pt1 - point 1

pt2 - point 2

Returns:

true when the line between pt1 and pt2 crosses the seam.

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

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

latLonToProj

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

Convert lat/lon coordinates to projection coordinates.

Overrides:

latLonToProj in class ProjectionImpl

Parameters:

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

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

latIndex - index of latitude in "from"

lonIndex - index of longitude in "from"

Returns:

the "to" array.

projToLatLon

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

Convert lat/lon coordinates to projection coordinates.

Overrides:

projToLatLon in class ProjectionImpl

Parameters:

from - array of lat/lon coordinates: from[2][n], where (from[0][i], from[1][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

Returns:

the "to" array

latLonToProj

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

Convert lat/lon coordinates to projection coordinates.

Overrides:

latLonToProj in class ProjectionImpl

Parameters:

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

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

latIndex - index of latitude in "from"

lonIndex - index of longitude in "from"

Returns:

the "to" array.

projToLatLon

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

Convert lat/lon coordinates to projection coordinates.

Overrides:

projToLatLon in class ProjectionImpl

Parameters:

from - array of lat/lon coordinates: from[2][n], where (from[0][i], from[1][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

Returns:

the "to" array

main

public static void main(java.lang.String[] args)

Test

Parameters:

args - not used