org.gicentre.utils.spatial

Class LambertConformalConic

java.lang.Object

org.gicentre.utils.spatial.LambertConformalConic

All Implemented Interfaces:

MapProjection

public class LambertConformalConic
extends java.lang.Object
implements MapProjection

Class for representing Lambert conformal conic projectiAlons. Includes forward and inverse transforms from/to lat,long. Uses transformation equations from Snyder (1987) Map Projections - A Working Manual

Version:

3.4, 5th February, 2016.

Field Summary

Fields

Modifier and Type	Field and Description
static int	FROM_LAT_LONG Indicates a transformation from latitude/longitude
static int	TO_LAT_LONG Indicates a transformation to latitude/longitude

Constructor Summary

Constructors

Constructor and Description
LambertConformalConic(double lat1, double lon0, double lat0) Initialises the projection converter assuming spherical figure of the earth and single standard parallel and centred at the given location.
LambertConformalConic(Ellipsoid ellipsoid, double lat1, double lat2, double lon0, double lat0, double falseEast, double falseNorth) Initialises the projection converter with the given ellipsoid.

Method Summary

Modifier and Type	Method and Description
boolean	doInterpolation() Indicates whether the transformation should use nearest neighbour (false) or some interpolator (true).
java.lang.String	getDescription() Provides a general description of the transformation.
Ellipsoid	getEllipsoid() Reports the ellipsoid used in the transformation.
processing.core.PVector	invTransformCoords(processing.core.PVector p) Performs an inverse transformation (Lambert conformal conic to latitude/longitude) on the given location.
processing.core.PVector	LambertToLatLong(processing.core.PVector p) Converts the given coordinates that use the Lambert conformal conic projection into a (longitude,latitude) location.
processing.core.PVector	latLongToLambert(processing.core.PVector p) Converts the given (lng, lat) coordinates into a location referenced using the Lambert conformal conic projection.
void	setInterpolation(boolean doInterpolation) Sets whether the transformation should use nearest neighbour (false) or some interpolator (true).
processing.core.PVector	transformCoords(processing.core.PVector p) Performs a forward transformation (latitude/longitude to Lambert conformal conic) on the given location.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

FROM_LAT_LONG

public static final int FROM_LAT_LONG

Indicates a transformation from latitude/longitude

See Also:

Constant Field Values

TO_LAT_LONG

public static final int TO_LAT_LONG

Indicates a transformation to latitude/longitude

See Also:

Constant Field Values

Constructor Detail

LambertConformalConic

public LambertConformalConic(double lat1,
                             double lon0,
                             double lat0)

Initialises the projection converter assuming spherical figure of the earth and single standard parallel and centred at the given location. The forward transformation will be from lat/long to Lambert conformal conic.

Parameters:

lat1 - The single standard parallel in degrees (north of equator positive).

lon0 - Centre longitude in degrees (east of Greenwich positive).

lat0 - Centre latitude in degrees (north of equator positive).

LambertConformalConic

public LambertConformalConic(Ellipsoid ellipsoid,
                             double lat1,
                             double lat2,
                             double lon0,
                             double lat0,
                             double falseEast,
                             double falseNorth)

Initialises the projection converter with the given ellipsoid. The forward transformation will be from lat/long to Lambert conformal conic.

Parameters:

ellipsoid - to use in projection.

lat1 - First standard parallel in degrees (north of equator positive).

lat2 - Second standard parallel in degrees (north of equator positive).

lon0 - Centre longitude in degrees (east of Greenwich positive).

lat0 - Centre latitude in degrees (north of equator positive).

falseEast - False easting (offset in metres).

falseNorth - False northing (offset in metres).

Method Detail

transformCoords

public processing.core.PVector transformCoords(processing.core.PVector p)

Performs a forward transformation (latitude/longitude to Lambert conformal conic) on the given location.

Specified by:

transformCoords in interface MapProjection

Parameters:

p - Location of point to transform.

Returns:

Transformed location coordinates.

invTransformCoords

public processing.core.PVector invTransformCoords(processing.core.PVector p)

Performs an inverse transformation (Lambert conformal conic to latitude/longitude) on the given location.

Specified by:

invTransformCoords in interface MapProjection

Parameters:

p - Location of point to transform.

Returns:

Transformed location coordinates.

getDescription

public java.lang.String getDescription()

Provides a general description of the transformation.

Specified by:

getDescription in interface MapProjection

Returns:

Description of the transformation.

doInterpolation

public boolean doInterpolation()

Indicates whether the transformation should use nearest neighbour (false) or some interpolator (true).

Returns:

True if transformation should perform some local interpolation.

setInterpolation

public void setInterpolation(boolean doInterpolation)

Sets whether the transformation should use nearest neighbour (false) or some interpolator (true).

Parameters:

doInterpolation - True if transformation should perform some local interpolation.

latLongToLambert

public processing.core.PVector latLongToLambert(processing.core.PVector p)

Converts the given (lng, lat) coordinates into a location referenced using the Lambert conformal conic projection. Latitude/longitude coordinates should be in decimal degrees with positive North and positive East.

Parameters:

p - Longitude/latitude point. Longitude varies within +-180 degrees, latitude within +-90 degrees.

Returns:

Location (units in metres) using Lambert conformal conic coordinate system.

LambertToLatLong

public processing.core.PVector LambertToLatLong(processing.core.PVector p)

Converts the given coordinates that use the Lambert conformal conic projection into a (longitude,latitude) location. Longitude and latitude will be in decimal degrees with positive North and positive East.

Parameters:

p - Location of point as an easting and northing in the Lambert projection (metres from local origin).

Returns:

location in geographical coordinates (longitude/latitude decimal degrees).

getEllipsoid

public Ellipsoid getEllipsoid()

Reports the ellipsoid used in the transformation.

Returns:

Ellipsoid used in the UTM transformation.