IlvFrenchLambertProjection Class Reference

This class defines the Lambert projection used in France. More...

#include <ilviews/maps/projection/frlamber.h>

Inheritance diagram for IlvFrenchLambertProjection:

Public Member Functions
	IlvFrenchLambertProjection (IlvFrenchLambertMode mode=IlvFrenchLambert_II_extended)
	Initializes an instance of IlvFrenchLambertPojection and sets it to the specified mode. More...
virtual IlvProjection *	copy () const
	Returns a copy of the projection. It must be overridden in each subclass. More...
virtual IlvProjectionClassInfo *	getClassInfo () const
	Returns the class information for the projection. More...
IlvFrenchLambertMode	getMode () const
	Returns the mode of the projection. More...
virtual void	setLLCenter (double, double)
	Specifies the central meridian and the central parallel (in radian) associated with the projection. More...
void	setMode (IlvFrenchLambertMode mode)
	Sets the mode of the projection. More...
virtual IlvMapsError	setSecantLatitudes (const IlvCoordinate &secant)
	Sets the latitudes at which the cone of the projection intersects with the earth. More...
virtual void	write (IlvOutputFile &) const
	Saves the parameters of a projection to the specified output file. More...
Public Member Functions inherited from IlvLambertConformalConicProjection
	IlvLambertConformalConicProjection (IlDouble l1=IlvMaps::DegreeToRadian(33.), IlDouble l2=IlvMaps::DegreeToRadian(45.))
	Initializes an instance of the class IlvLambertConformalConicProjection and sets its secant latitudes to the specified values.
IlDouble	getScaleFactor () const
	Returns the scale factor applied to the projected data. More...
virtual IlvMapsError	setEllipsoid (const IlvEllipsoid &ellipsoid)
	Sets the ellipsoid used for the projection. More...
void	setScaleFactor (IlDouble k0)
	Sets the scale factor applied to the projected data. More...
Public Member Functions inherited from IlvConicProjection
IlDouble	getSecantLatitude1 (void) const
	Gets the first secant latitude. More...
IlDouble	getSecantLatitude2 (void) const
	Gets the second secant latitude. More...
const IlvCoordinate &	getSecantLatitudes () const
	Returns the secant latitudes of the projection in an IlvCoordinate. More...
IlvMapsError	setSecantLatitude1 (IlDouble v)
	Sets the first secant latitude. More...
IlvMapsError	setSecantLatitude2 (IlDouble v)
	Sets the second secant latitude. More...
Public Member Functions inherited from IlvProjection
IlvMapsError	forward (const IlvCoordinate &llIn, IlvCoordinate &xyOut) const
	Converts a latitude and a longitude to Cartesian coordinates (x,y). More...
IlvMapsError	forward (IlvCoordinate &x) const
	This member function converts a latitude and a longitude to Cartesian coordinates. More...
IlDouble	getCentralMeridian () const
	Returns the central meridian of the projection. More...
IlDouble	getCentralParallel () const
	Returns the central parallel of the projection. More...
const IlvHorizontalDatum *	getDatum (void) const
	Returns the horizontal datum used for the projection. More...
const IlvEllipsoid *	getEllipsoid (void) const
	Returns the ellipsoid used for the projection. More...
IlvMapsError	getError () const
	Returns the status of the projection. If the projection is valid, the function returns IlvMapsError::NoError(), otherwise, it returns an error code. See the IlvMaps class to know how to interpret the error codes. More...
IlDouble	getFalseEasting () const
	Returns the false easting of the projection. More...
IlDouble	getFalseNorthing () const
	Returns the false northing of the projection. More...
IlvProjectionInterface *	getInterface ()
	Returns the interface of the projection. More...
IlvCoordinate	getLLCenter (void) const
	Returns the central meridian and the central parallel associated with the projection (0-0 by default). More...
IlvProjectionGeometricProperty	getProperty () const
	Returns the geometric property of the projection. More...
const IlvUnitConverter *	getUnitConverter () const
	Returns the unit converter. More...
IlvCoordinate	getXYOffset (void) const
	Returns the false easting and the false northing of the projection. More...
IlvMapsError	inverse (const IlvCoordinate &xyIn, IlvCoordinate &llOut) const
	Converts the specified coordinate to a latitude and a longitude. More...
IlvMapsError	inverse (IlvCoordinate &x) const
	Converts the IlvCoordinate representing Cartesian coordinates to a latitude and a longitude. More...
IlBoolean	isBad () const
	Checks for an inconsistent state of the projection. More...
IlBoolean	isEllipsoidEnabled () const
	Returns IlTrue if non spherical ellipsoids can be used for the projection. More...
IlBoolean	isGeocentric () const
	Checks if the projection uses geocentric latitudes. More...
IlBoolean	isInverseEnabled () const
	Returns IlTrue if the inverse function is supported by the projection. More...
IlBoolean	isShared () const
	Returns IlTrue if the projection is shared. More...
IlBoolean	isUsingLongitudeReduction () const
	Returns IlTrue if the projection uses range reduction for longitudes. More...
void	lock ()
	Locks the projection.
virtual IL_STDPREF ostream &	printPROJ4Descriptor (IL_STDPREF ostream &, IlvMapsError *status=0) const
	This virtual member function converts the projection to a string in the PROJ4 format. More...
void	save (IlvOutputFile &outputFile) const
	Saves an instance of a subclass of IlvProjection to the specified output file. More...
void	setCentralMeridian (IlDouble lon)
	Sets the central meridian of the projection. More...
void	setCentralParallel (IlDouble lat)
	Sets the central parallel of the projection. More...
virtual IlvMapsError	setDatum (const IlvHorizontalDatum *datum)
	Sets the datum used for the projection. More...
void	setFalseEasting (IlDouble falseEasting)
	Sets the false easting of the projection. More...
void	setFalseNorthing (IlDouble falseNorthing)
	Sets the false northing of the projection. More...
void	setGeocentric (IlBoolean geoc)
	Specifies whether the projection uses geocentric or geodetic latitudes. More...
void	setShared ()
	Specifies that the projection will be shared. More...
void	setUnitConverter (const IlvUnitConverter &converter)
	Sets the unit converter of the projection. The default unit is meters. More...
void	setUsingLongitudeReduction (IlBoolean use)
	Specifies whether the projection uses longitude reduction. More...
void	setXYOffset (IlDouble x0, IlDouble y0)
	Specifies the false easting and the false northing. More...
void	unLock ()
	Unlocks the object. More...

Static Public Member Functions
static const IlvEllipsoid *	GetNTFEllipsoid ()
	Returns the ellipsoid used for the NTF geodesic system. More...
static IlDouble	GetParisMeridian ()
	Returns the longitude of the Paris meridian in radian. More...
static const IlvEllipsoid *	GetRGF93Ellipsoid ()
	Returns the ellipsoid used for the Lambert 93 mode of the projection. More...

Additional Inherited Members
Protected Member Functions inherited from IlvLambertConformalConicProjection
virtual IlvMapsError	eForward (IlvCoordinate &ll) const
	Must be redefined in subclasses to implement the projection for a non spherical ellipsoid. More...
virtual IlvMapsError	eInverse (IlvCoordinate &xy) const
	Implements the inverse projection for a non spherical ellipsoid. More...
virtual IlvMapsError	sForward (IlvCoordinate &ll) const
	Must be redefined in subclasses to implement the projection for a sphere. More...
virtual IlvMapsError	sInverse (IlvCoordinate &xy) const
	Must be redefined in subclasses to implement the inverse projection for a sphere. More...

Detailed Description

This class defines the Lambert projection used in France.

It is a special form of the IlvLambertConformalConicProjection for which a set of parameters is defined for six different modes.
For small scale maps (1:25 000 and smaller), France has been divided into four zones. To each zone corresponds a mode of the projection:

• Mode Lambert I is used for maps located in the north of France.
• Mode Lambert II is used for maps located in the center of France.
• Mode Lambert III is used for maps located in the south of France.
• Mode Lambert IV is used for maps located in Corsica.

For large scale maps, the Lambert II extended mode is generally used. Another mode is used for maps using the RGF93 geodesic system (RGF93 stands for "Réseau Géodesique Francais"). This mode is called Lambert 93.
The first five modes of the projection use an IGN version of the Clarke 1880 ellipsoid, while the Lambert 93 mode uses the GRS80 ellipsoid. The first five modes are centered on the Paris meridian that passes through the middle of the facade of the "Observatoire de Paris." The Lambert 93 is centered at 3 degrees east.

Library: ilvmaps

Constructor & Destructor Documentation

IlvFrenchLambertProjection::IlvFrenchLambertProjection

(

IlvFrenchLambertMode

mode = IlvFrenchLambert_II_extended

)

Initializes an instance of IlvFrenchLambertPojection and sets it to the specified mode.

Parameters

mode	IlvFrenchLambertMode.

See Also

IlvFrenchLambertMode.

Member Function Documentation

virtual IlvProjection* IlvFrenchLambertProjection::copy ( ) const

virtual

Returns a copy of the projection. It must be overridden in each subclass.

Returns

The copy of the object.

Implements IlvProjection.

virtual IlvProjectionClassInfo* IlvFrenchLambertProjection::getClassInfo ( ) const

virtual

Returns the class information for the projection.

Returns

The class information for the projection.

Reimplemented from IlvConicProjection.

IlvFrenchLambertMode IlvFrenchLambertProjection::getMode

(

)

const

Returns the mode of the projection.

Returns

The mode of the projection.

static const IlvEllipsoid* IlvFrenchLambertProjection::GetNTFEllipsoid ( )

static

Returns the ellipsoid used for the NTF geodesic system.

This geodesic system is used by the modes Lambert_I, Lambert_II, Lambert_III, Lambert_IV and Lambert_II_extended.

Returns

the ellipsoid used for the NTF geodesic system.

static IlDouble IlvFrenchLambertProjection::GetParisMeridian ( )

static

Returns the longitude of the Paris meridian in radian.

Returns

The longitude of the Paris meridian.

static const IlvEllipsoid* IlvFrenchLambertProjection::GetRGF93Ellipsoid ( )

static

Returns the ellipsoid used for the Lambert 93 mode of the projection.

Returns

The ellipsoid used for the Lambert 93 mode.

virtual void IlvFrenchLambertProjection::setLLCenter ( double  lon, double  lat  )

virtual

Specifies the central meridian and the central parallel (in radian) associated with the projection.

By default, theses values are set to 0. This function is virtual because it can be overridden by subclasses of IlvProjection to update the internal parameters when the center is changed.

Parameters

lon	The central meridian in radian.
lat	The central parallel in radian.

Reimplemented from IlvLambertConformalConicProjection.

void IlvFrenchLambertProjection::setMode

(

IlvFrenchLambertMode

mode

)

Sets the mode of the projection.

Parameters

mode	The mode of the projection.

virtual IlvMapsError IlvFrenchLambertProjection::setSecantLatitudes ( const IlvCoordinate &  secant )

virtual

Sets the latitudes at which the cone of the projection intersects with the earth.

Parameters

secant

A vector that contains two values: secant.x represents the first latitude at which the cone intersects with the earth. secant.y represents the second latitude at which the cone intersects with the earth. Both values are expressed in radian.

Returns

An error status if the latitudes specify a limiting form, that is, if secant.x = -secant.y or secant.x = secant.y = PI/2.

Reimplemented from IlvLambertConformalConicProjection.

virtual void IlvFrenchLambertProjection::write ( IlvOutputFile &  outputFile ) const

virtual

Saves the parameters of a projection to the specified output file.

It must be overridden by subclasses of IlvProjection that need to save additional parameters. This function should not be directly called; use the save function instead.

Parameters

outputFile

The file to write the projection parameters to.

Reimplemented from IlvLambertConformalConicProjection.