ucar.unidata.geoloc.projection

Class LambertConformal

java.lang.Object

ucar.unidata.geoloc.ProjectionImpl

ucar.unidata.geoloc.projection.LambertConformal

All Implemented Interfaces:

java.io.Serializable, Projection

public class LambertConformal
extends ProjectionImpl

Lambert Conformal Projection, one or two standard parallels, spherical earth. Projection plane is a cone whose vertex lies on the line of the earth's axis, and intersects the earth at two parellels (par1, par2), or is tangent to the earth at one parellel par1 = par2. The cone is flattened by splitting along the longitude = lon0+180.

See John Snyder, Map Projections used by the USGS, Bulletin 1532, 2nd edition (1983), p 104

See Also:

Projection, ProjectionImpl, Serialized Form

Field Summary

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
LambertConformal() Constructor with default parameters
LambertConformal(double lat0, double lon0, double par1, double par2) Construct a LambertConformal Projection, two standard parellels.
LambertConformal(double lat0, double lon0, double par1, double par2, double false_easting, double false_northing) Construct a LambertConformal Projection, two standard parellels.
LambertConformal(double lat0, double lon0, double par1, double par2, double false_easting, double false_northing, double earth_radius) Construct a LambertConformal Projection, two standard parellels.

Method Summary

Modifier and Type	Method and Description
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 o) Returns true if this represents the same Projection as proj.
double	getFalseEasting() Get the false easting, in km.
double	getFalseNorthing() Get the false northing, in km.
double	getOriginLat() Get the origin latitude in degrees
double	getOriginLon() Get the origin longitude in degrees
double	getParallelOne() Get the first standard parallel
double	getParallelTwo() Get the second standard parallel
java.lang.String	getProjectionTypeLabel() Get the label to be used in the gui for this type of projection
double	getScale(double lat) Get the scale at the given lat.
int	hashCode()
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
java.lang.String	paramsToString() Create a String of the parameters.
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.
void	setFalseEasting(double falseEasting) Set the false_easting, in km.
void	setFalseNorthing(double falseNorthing) Set the false northing, in km.
void	setOriginLat(double lat0)
void	setOriginLon(double lon0)
void	setParallelOne(double par1)
void	setParallelTwo(double par2)
void	setParellelOne(double par1)
void	setParellelTwo(double par2)
java.lang.String	toString() Get a String representation of this projection.
java.lang.String	toWKS() Create a WKS string

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, latLonToProj, latLonToProjBB, projToLatLon, projToLatLon, projToLatLon, projToLatLon, projToLatLonBB, projToLatLonBBold, setDefaultMapArea, setName

Methods inherited from class java.lang.Object

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

Constructor Detail

LambertConformal

public LambertConformal()

Constructor with default parameters

LambertConformal

public LambertConformal(double lat0,
                        double lon0,
                        double par1,
                        double par2)

Construct a LambertConformal Projection, two standard parellels. For the one standard parellel case, set them both to the same value.

Parameters:

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

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

par1 - standard parallel 1

par2 - standard parallel 2

Throws:

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

LambertConformal

public LambertConformal(double lat0,
                        double lon0,
                        double par1,
                        double par2,
                        double false_easting,
                        double false_northing)

Construct a LambertConformal Projection, two standard parellels. For the one standard parellel case, set them both to the same value.

Parameters:

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

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

par1 - standard parallel 1

par2 - standard parallel 2

false_easting - natural_x_coordinate + false_easting = x coordinate in km

false_northing - natural_y_coordinate + false_northing = y coordinate in km

Throws:

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

LambertConformal

public LambertConformal(double lat0,
                        double lon0,
                        double par1,
                        double par2,
                        double false_easting,
                        double false_northing,
                        double earth_radius)

Construct a LambertConformal Projection, two standard parellels. For the one standard parellel case, set them both to the same value.

Parameters:

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

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

par1 - standard parallel 1

par2 - standard parallel 2

false_easting - natural_x_coordinate + false_easting = x coordinate in km

false_northing - natural_y_coordinate + false_northing = y coordinate in km

earth_radius - radius of the earth in km

Throws:

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

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

equals

public boolean equals(java.lang.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 java.lang.Object

getParallelTwo

public double getParallelTwo()

Get the second standard parallel

Returns:

the second standard parallel

getParallelOne

public double getParallelOne()

Get the first standard parallel

Returns:

the first standard parallel

getOriginLon

public double getOriginLon()

Get the origin longitude in degrees

Returns:

the origin longitude.

getOriginLat

public double getOriginLat()

Get the origin latitude in degrees

Returns:

the origin latitude.

getFalseEasting

public double getFalseEasting()

Get the false easting, in km.

Returns:

the false easting.

getFalseNorthing

public double getFalseNorthing()

Get the false northing, in km.

Returns:

the false northing.

setOriginLat

public void setOriginLat(double lat0)

setOriginLon

public void setOriginLon(double lon0)

setParellelOne

public void setParellelOne(double par1)

setParellelTwo

public void setParellelTwo(double par2)

setParallelOne

public void setParallelOne(double par1)

setParallelTwo

public void setParallelTwo(double par2)

setFalseEasting

public void setFalseEasting(double falseEasting)

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

Parameters:

falseEasting - x offset

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

toString

public java.lang.String toString()

Description copied from class: ProjectionImpl

Get a String representation of this projection.

Overrides:

toString in class ProjectionImpl

Returns:

the name of the projection. This is what gets displayed when you add the projection object to a UI widget (e.g. label, combobox)

toWKS

public java.lang.String toWKS()

Create a WKS string

Returns:

WKS string

getScale

public double getScale(double lat)

Get the scale at the given lat.

Parameters:

lat - lat to use

Returns:

scale factor at this latitude

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[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 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

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[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 double[][] projToLatLon(double[][] from,
                               double[][] 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