#include <ossimEckert4Projection.h>

Inheritance diagram for ossimEckert4Projection:

Public Member Functions
	ossimEckert4Projection (const ossimEllipsoid &ellipsoid=ossimEllipsoid(), const ossimGpt &origin=ossimGpt())

	ossimEckert4Projection (const ossimEllipsoid &ellipsoid, const ossimGpt &origin, double falseEasting, double falseNorthing)

	~ossimEckert4Projection ()

virtual ossimObject *	dup () const

virtual ossimDpt	forward (const ossimGpt &worldPoint) const
	All map projections will convert the world coordinate to an easting northing (Meters). More...

virtual ossimGpt	inverse (const ossimDpt &projectedPoint) const
	Will take a point in meters and convert it to ground. More...

virtual void	update ()

void	setFalseEasting (double falseEasting)

void	setFalseNorthing (double falseNorthing)

void	setFalseEastingNorthing (double falseEasting, double falseNorthing)

double	getFalseEasting () const

double	getFalseNorthing () const

void	setDefaults ()

virtual bool	saveState (ossimKeywordlist &kwl, const char *prefix=0) const

virtual bool	loadState (const ossimKeywordlist &kwl, const char *prefix=0)

Public Member Functions inherited from ossimMapProjection
	ossimMapProjection (const ossimEllipsoid &ellipsoid=ossimEllipsoid(), const ossimGpt &origin=ossimGpt())

	ossimMapProjection (const ossimMapProjection &src)

virtual ossimGpt	origin () const

virtual ossimDpt	worldToLineSample (const ossimGpt &worldPoint) const

virtual void	worldToLineSample (const ossimGpt &worldPoint, ossimDpt &lineSample) const

virtual ossimGpt	lineSampleToWorld (const ossimDpt &projectedPoint) const

virtual void	lineSampleToWorld (const ossimDpt &projectedPoint, ossimGpt &gpt) const

virtual void	lineSampleHeightToWorld (const ossimDpt &lineSampPt, const double &heightAboveEllipsoid, ossimGpt &worldPt) const
	This is the pure virtual that projects the image point to the given elevation above ellipsoid, thereby bypassing reference to a DEM. More...

virtual void	lineSampleToEastingNorthing (const ossimDpt &liineSample, ossimDpt &eastingNorthing) const

virtual void	eastingNorthingToLineSample (const ossimDpt &eastingNorthing, ossimDpt &lineSample) const

virtual void	eastingNorthingToWorld (const ossimDpt &eastingNorthing, ossimGpt &worldPt) const

virtual double	getStandardParallel1 () const
	Derived classes should implement as needed. More...

virtual double	getStandardParallel2 () const
	Derived classes should implement as needed. More...

virtual void	setPcsCode (ossim_uint32 pcsCode)

virtual ossim_uint32	getPcsCode () const
	Returns the EPSG PCS code or 32767 if the projection is a custom (non-EPSG) projection. More...

virtual ossimString	getProjectionName () const
	Returns the projection name. More...

virtual double	getA () const
	ACCESS METHODS: More...

virtual double	getB () const

virtual double	getF () const

virtual ossimDpt	getMetersPerPixel () const

virtual const ossimDpt &	getDecimalDegreesPerPixel () const
	Returns decimal degrees per pixel as an ossimDpt with "x" representing longitude and "y" representing latitude. More...

virtual const ossimDpt &	getUlEastingNorthing () const

virtual const ossimGpt &	getUlGpt () const

virtual const ossimDatum *	getDatum () const

const ossimEllipsoid &	getEllipsoid () const

const ossimGpt &	getOrigin () const

virtual bool	isGeographic () const

virtual void	applyScale (const ossimDpt &scale, bool recenterTiePoint)
	Applies scale to theDeltaLonPerPixel, theDeltaLatPerPixel and theMetersPerPixel data members (eg: theDeltaLonPerPixel *= scale.x). More...

virtual void	setEllipsoid (const ossimEllipsoid &ellipsoid)
	SET METHODS: More...

virtual void	setAB (double a, double b)

virtual void	setDatum (const ossimDatum *datum)
	Sets theDatum to datum. More...

virtual void	setOrigin (const ossimGpt &origin)
	Sets theOrigin to origin. More...

virtual void	setMetersPerPixel (const ossimDpt &gsd)

virtual void	setDecimalDegreesPerPixel (const ossimDpt &gsd)

virtual void	setUlTiePoints (const ossimGpt &gpt)

virtual void	setUlTiePoints (const ossimDpt &eastingNorthing)

virtual void	setUlEastingNorthing (const ossimDpt &ulEastingNorthing)

virtual void	setUlGpt (const ossimGpt &ulGpt)

virtual void	assign (const ossimProjection &aProjection)

virtual std::ostream &	print (std::ostream &out) const
	Prints data members to stream. More...

virtual bool	operator== (const ossimProjection &projection) const
	Compares this to arg projection and returns TRUE if the same. More...

virtual void	computeDegreesPerPixel ()
	Computes the approximate resolution in degrees/pixel. More...

virtual void	computeMetersPerPixel ()
	This will go from the ground point and give you an approximate meters per pixel. More...

void	setMatrix (double rotation, const ossimDpt &scale, const ossimDpt &translation)

void	setMatrixScale (const ossimDpt &scale)

void	setMatrixRotation (double rotation)

void	setMatrixTranslation (const ossimDpt &translation)

void	snapTiePointTo (ossim_float64 multiple, ossimUnitType unitType)
	Utility method to snap the tie point to some multiple. More...

void	snapTiePointToOrigin ()

void	setElevationLookupFlag (bool flag)

bool	getElevationLookupFlag () const

ossimUnitType	getModelTransformUnitType () const

void	setModelTransformUnitType (ossimUnitType unit)

bool	hasModelTransform () const

virtual bool	isAffectedByElevation () const
	Implementation of pure virtual ossimProjection::isAffectedByElevation method. More...

void	setProjectionUnits (ossimUnitType units)

ossimUnitType	getProjectionUnits () const
	OSSIM considers all map projection coordinates (including false eastings and northings) to be in meters. More...

virtual bool	isEqualTo (const ossimObject &obj, ossimCompareType compareType=OSSIM_COMPARE_FULL) const

Public Member Functions inherited from ossimProjection
	ossimProjection ()

virtual	~ossimProjection ()

virtual void	getRoundTripError (const ossimDpt &imagePoint, ossimDpt &errorResult) const

virtual void	getRoundTripError (const ossimGpt &groundPoint, ossimDpt &errorResult) const

virtual void	getGroundClipPoints (ossimGeoPolygon &gpts) const

virtual bool	operator!= (const ossimProjection &projection) const

Public Member Functions inherited from ossimObject
	ossimObject ()

virtual	~ossimObject ()

virtual ossimString	getShortName () const

virtual ossimString	getLongName () const

virtual ossimString	getDescription () const

virtual ossimString	getClassName () const

virtual RTTItypeid	getType () const

virtual bool	canCastTo (ossimObject *obj) const

virtual bool	canCastTo (const RTTItypeid &id) const

virtual bool	canCastTo (const ossimString &parentClassName) const

virtual void	accept (ossimVisitor &visitor)

Public Member Functions inherited from ossimReferenced
	ossimReferenced ()

	ossimReferenced (const ossimReferenced &)

ossimReferenced &	operator= (const ossimReferenced &)

void	ref () const
	increment the reference count by one, indicating that this object has another pointer which is referencing it. More...

void	unref () const
	decrement the reference count by one, indicating that a pointer to this object is referencing it. More...

void	unref_nodelete () const
	decrement the reference count by one, indicating that a pointer to this object is referencing it. More...

int	referenceCount () const

Public Member Functions inherited from ossimErrorStatusInterface
	ossimErrorStatusInterface ()

virtual	~ossimErrorStatusInterface ()

virtual ossimErrorCode	getErrorStatus () const

virtual ossimString	getErrorStatusString () const

virtual void	setErrorStatus (ossimErrorCode error_status) const

virtual void	setErrorStatus () const

virtual void	clearErrorStatus () const

bool	hasError () const

Private Member Functions
long	Set_Eckert4_Parameters (double a, double f, double Central_Meridian, double False_Easting, double False_Northing)

void	Get_Eckert4_Parameters (double a, double f, double Central_Meridian, double False_Easting, double *False_Northing) const

long	Convert_Geodetic_To_Eckert4 (double Latitude, double Longitude, double Easting, double Northing) const

long	Convert_Eckert4_To_Geodetic (double Easting, double Northing, double Latitude, double Longitude) const

Private Attributes
double	Eck4_a

double	Eck4_f

double	es2

double	es4

double	es6

double	Ra0

double	Ra1

double	Eck4_Origin_Long

double	Eck4_False_Easting

double	Eck4_False_Northing

double	Eck4_Delta_Northing

double	Eck4_Max_Easting

double	Eck4_Min_Easting

Additional Inherited Members
Protected Member Functions inherited from ossimMapProjection
virtual	~ossimMapProjection ()

void	updateFromTransform ()

Protected Member Functions inherited from ossimReferenced
virtual	~ossimReferenced ()

Protected Attributes inherited from ossimMapProjection
ossimEllipsoid	theEllipsoid
	This method verifies that the projection parameters match the current pcs code. More...

ossimGpt	theOrigin

const ossimDatum *	theDatum
	This is only set if we want to have built in datum shifting. More...

ossimDpt	theMetersPerPixel
	Holds the number of meters per pixel. More...

ossimDpt	theDegreesPerPixel
	Hold the decimal degrees per pixel. More...

ossimGpt	theUlGpt
	Hold tie point in decimal degrees. More...

ossimDpt	theUlEastingNorthing
	Hold tie point as easting northing. More...

ossimDpt	theFalseEastingNorthing
	Hold the false easting northing. More...

ossim_uint32	thePcsCode
	Projection Coordinate System(PCS) code. More...

bool	theElevationLookupFlag

ossimMatrix4x4	theModelTransform

ossimMatrix4x4	theInverseModelTransform

ossimUnitType	theModelTransformUnitType

ossimUnitType	theProjectionUnits
	Linear units of the projection as indicated in the projection's specification: More...

Protected Attributes inherited from ossimErrorStatusInterface
ossimErrorCode	theErrorStatus

Detailed Description

Definition at line 16 of file ossimEckert4Projection.h.

Constructor & Destructor Documentation

◆ ossimEckert4Projection() [1/2]

ossimEckert4Projection::ossimEckert4Projection	(	const ossimEllipsoid &	ellipsoid = `ossimEllipsoid()`,
		const ossimGpt &	origin = `ossimGpt()`
	)

Definition at line 51 of file ossimEckert4Projection.cpp.

References setDefaults(), and update().

    :ossimMapProjection(ellipsoid, origin)
 {
    setDefaults();
    update();
 }

◆ ossimEckert4Projection() [2/2]

ossimEckert4Projection::ossimEckert4Projection	(	const ossimEllipsoid &	ellipsoid,
		const ossimGpt &	origin,
		double	falseEasting,
		double	falseNorthing
	)

Definition at line 59 of file ossimEckert4Projection.cpp.

References Eck4_Delta_Northing, Eck4_False_Easting, Eck4_False_Northing, Eck4_Max_Easting, Eck4_Min_Easting, and update().

    :ossimMapProjection(ellipsoid, origin)
 {
    
    Eck4_False_Easting  = falseEasting;
    Eck4_False_Northing = falseNorthing;
    Eck4_Delta_Northing = 8451144.0;
    Eck4_Max_Easting    = 16902288.0;
    Eck4_Min_Easting    = -16902288.0;
 
    update();
 }

◆ ~ossimEckert4Projection()

ossimEckert4Projection::~ossimEckert4Projection ( )

inline

Definition at line 26 of file ossimEckert4Projection.h.

26 {}

Member Function Documentation

◆ Convert_Eckert4_To_Geodetic()

long ossimEckert4Projection::Convert_Eckert4_To_Geodetic	(	double	Easting,
		double	Northing,
		double *	Latitude,
		double *	Longitude
	)		const

private

The function Convert_Eckert4_To_Geodetic converts Eckert IV projection easting and northing coordinates to geodetic (latitude and longitude) coordinates, according to the current ellipsoid and Eckert IV projection coordinates. If any errors occur, the error code(s) are returned by the function, otherwise ECK4_NO_ERROR is returned.

Easting : Easting (X) in meters (input) Northing : Northing (Y) in meters (input) Latitude : Latitude (phi) in radians (output) Longitude : Longitude (lambda) in radians (output)

Definition at line 359 of file ossimEckert4Projection.cpp.

References Eck4_False_Easting, Eck4_False_Northing, ECK4_NO_ERROR, Eck4_Origin_Long, NUM, Ra0, Ra1, and two_PLUS_PI_OVER_2.

Referenced by inverse().

 { /* Begin Convert_Eckert4_To_Geodetic */
 /*
  * The function Convert_Eckert4_To_Geodetic converts Eckert IV projection
  * (easting and northing) coordinates to geodetic (latitude and longitude)
  * coordinates, according to the current ellipsoid, spherical radius and
  * Eckert IV projection coordinates.
  * If any errors occur, the error code(s) are returned by the
  * function, otherwise ECK4_NO_ERROR is returned.
  *
  *    Easting           : Easting (X) in meters                  (input)
  *    Northing          : Northing (Y) in meters                 (input)
  *    Latitude          : Latitude (phi) in radians              (output)
  *    Longitude         : Longitude (lambda) in radians          (output)
  */
 
   double theta;
   double sin_theta, cos_theta;
   double num;
   double dx, dy;
   double i;
 
   long Error_Code = ECK4_NO_ERROR;
 
 //   if ((Easting < (Eck4_False_Easting + Eck4_Min_Easting))
 //       || (Easting > (Eck4_False_Easting + Eck4_Max_Easting)))
 //   { /* Easting out of range  */
 //     Error_Code |= ECK4_EASTING_ERROR;
 //   }
 //   if ((Northing < (Eck4_False_Northing - Eck4_Delta_Northing)) 
 //       || (Northing > (Eck4_False_Northing + Eck4_Delta_Northing)))
 //   { /* Northing out of range */
 //     Error_Code |= ECK4_NORTHING_ERROR;
 //   }
 
   if (!Error_Code)
   {
     dy = Northing - Eck4_False_Northing;
     dx = Easting - Eck4_False_Easting;
     i = dy / Ra1;
     if (i > 1.0)
       i = 1.0;
     else if (i < -1.0)
       i = -1.0;
 
     theta = asin(i);
     sin_theta = sin(theta);
     cos_theta = cos(theta);
     num = NUM(theta, sin_theta, cos_theta);
 
     *Latitude = asin(num / two_PLUS_PI_OVER_2);
     *Longitude = Eck4_Origin_Long + dx / (Ra0 * (1 + cos_theta));
 
 //     if (*Latitude > PI_OVER_2)  /* force distorted values to 90, -90 degrees */
 //       *Latitude = PI_OVER_2;
 //     else if (*Latitude < -PI_OVER_2)
 //       *Latitude = -PI_OVER_2;
 
 //     if (*Longitude > PI)
 //       *Longitude -= TWO_PI;
 //     if (*Longitude < -PI)
 //       *Longitude += TWO_PI;
 
 //     if (*Longitude > PI)  /* force distorted values to 180, -180 degrees */
 //       *Longitude = PI;
 //     else if (*Longitude < -PI)
 //       *Longitude = -PI;
 
   }
   return (Error_Code);
 
 } /* End Convert_Eckert4_To_Geodetic */

◆ Convert_Geodetic_To_Eckert4()

long ossimEckert4Projection::Convert_Geodetic_To_Eckert4	(	double	Latitude,
		double	Longitude,
		double *	Easting,
		double *	Northing
	)		const

private

The function Convert_Geodetic_To_Eckert4 converts geodetic (latitude and longitude) coordinates to Eckert IV projection easting, and northing coordinates, according to the current ellipsoid and Eckert IV projection parameters. If any errors occur, the error code(s) are returned by the function, otherwise ECK4_NO_ERROR is returned.

Latitude : Latitude (phi) in radians (input) Longitude : Longitude (lambda) in radians (input) Easting : Easting (X) in meters (output) Northing : Northing (Y) in meters (output)

Definition at line 290 of file ossimEckert4Projection.cpp.

References Eck4_False_Easting, Eck4_False_Northing, ECK4_NO_ERROR, Eck4_Origin_Long, NUM, Ra0, Ra1, and two_PLUS_PI_OVER_2.

Referenced by forward().

 { /* Begin Convert_Geodetic_To_Eckert4 */
 /*
  * The function Convert_Geodetic_To_Eckert4 converts geodetic (latitude and
  * longitude) coordinates to Eckert IV projection (easting and northing)
  * coordinates, according to the current ellipsoid, spherical radius and
  * Eckert IV projection parameters.
  * If any errors occur, the error code(s) are returned by the
  * function, otherwise ECK4_NO_ERROR is returned.
  *
  *    Latitude          : Latitude (phi) in radians           (input)
  *    Longitude         : Longitude (lambda) in radians       (input)
  *    Easting           : Easting (X) in meters               (output)
  *    Northing          : Northing (Y) in meters              (output)
  */
 
   double slat = sin(Latitude);
   double sin_theta, cos_theta;
   double num;
   double dlam;     /* Longitude - Central Meridan */
   double theta = Latitude / 2.0;
   double delta_theta = 1.0;
   double dt_tolerance = 4.85e-10;        /* approximately 1/1000th of
                                             an arc second or 1/10th meter */
   long Error_Code = ECK4_NO_ERROR;
 
 //   if ((Latitude < -PI_OVER_2) || (Latitude > PI_OVER_2))
 //   {  /* Latitude out of range */
 //     Error_Code |= ECK4_LAT_ERROR;
 //   }
 //   if ((Longitude < -PI) || (Longitude > TWO_PI))
 //   {  /* Longitude out of range */
 //     Error_Code|= ECK4_LON_ERROR;
 //   }
 
   if (!Error_Code)
   { /* no errors */
 
     dlam = Longitude - Eck4_Origin_Long;
 //     if (dlam > PI)
 //     {
 //       dlam -= TWO_PI;
 //     }
 //     if (dlam < -PI)
 //     {
 //       dlam += TWO_PI;
 //     }
     while (fabs(delta_theta) > dt_tolerance)
     {
        sin_theta = sin(theta);
        cos_theta = cos(theta);
        num = NUM(theta, sin_theta, cos_theta);
        delta_theta = -(num - two_PLUS_PI_OVER_2 * slat) /
                      (2.0 * cos_theta * (1.0 + cos_theta));
        theta += delta_theta;
     }
     *Easting = Ra0 * dlam * (1.0 + cos(theta)) + Eck4_False_Easting;
     *Northing = Ra1 * sin(theta) + Eck4_False_Northing; 
   }
   
   return (Error_Code);
 
 } /* End Convert_Geodetic_To_Eckert4 */

◆ dup()

virtual ossimObject* ossimEckert4Projection::dup ( ) const

inlinevirtual

Implements ossimProjection.

Definition at line 27 of file ossimEckert4Projection.h.

       {
          return new ossimEckert4Projection(*this);
       }

◆ forward()

ossimDpt ossimEckert4Projection::forward ( const ossimGpt & worldPoint ) const

virtual

All map projections will convert the world coordinate to an easting northing (Meters).

Implements ossimMapProjection.

Definition at line 104 of file ossimEckert4Projection.cpp.

References ossimGpt::changeDatum(), ossimDatum::code(), Convert_Geodetic_To_Eckert4(), ossimGpt::datum(), ossimGpt::latr(), ossimGpt::lonr(), and ossimMapProjection::theDatum.

 {
    double easting  = 0.0;
    double northing = 0.0;
    ossimGpt gpt = latLon;
    
    if (theDatum)
    {
       if (theDatum->code() != latLon.datum()->code())
       {
          gpt.changeDatum(theDatum); // Shift to our datum.
       }
    }
 
    Convert_Geodetic_To_Eckert4(gpt.latr(),
                                gpt.lonr(),
                                &easting,
                                &northing);
 
    return ossimDpt(easting, northing);
 }

◆ Get_Eckert4_Parameters()

void ossimEckert4Projection::Get_Eckert4_Parameters	(	double *	a,
		double *	f,
		double *	Central_Meridian,
		double *	False_Easting,
		double *	False_Northing
	)		const

private

The function Get_Eckert4_Parameters returns the current ellipsoid parameters and EckertIV projection parameters.

a : Semi-major axis of ellipsoid, in meters (output) f : Flattening of ellipsoid (output) Central_Meridian : Longitude in radians at the center of (output) the projection False_Easting : A coordinate value in meters assigned to the central meridian of the projection. (output) False_Northing : A coordinate value in meters assigned to the origin latitude of the projection (output)

Definition at line 261 of file ossimEckert4Projection.cpp.

References Eck4_a, Eck4_f, Eck4_False_Easting, Eck4_False_Northing, and Eck4_Origin_Long.

 { /* Begin Get_Eckert4_Parameters */
 /*
  * The function Get_Eckert4_Parameters returns the current ellipsoid
  * parameters and Eckert IV projection parameters.
  *
  *    a                 : Semi-major axis of ellipsoid, in meters   (output)
  *    f                 : Flattening of ellipsoid           (output)
  *    Central_Meridian  : Longitude in radians at the center of     (output)
  *                          the projection
  *    False_Easting     : A coordinate value in meters assigned to the
  *                          central meridian of the projection.     (output)
  *    False_Northing    : A coordinate value in meters assigned to the
  *                          origin latitude of the projection       (output)
  */
 
   *a = Eck4_a;
   *f = Eck4_f;
   *Central_Meridian = Eck4_Origin_Long;
   *False_Easting = Eck4_False_Easting;
   *False_Northing = Eck4_False_Northing;
   return;
 } /* End Get_Eckert4_Parameters */

◆ getFalseEasting()

double ossimEckert4Projection::getFalseEasting ( ) const

inlinevirtual

Returns: The false easting.

Reimplemented from ossimMapProjection.

Definition at line 54 of file ossimEckert4Projection.h.

54 {return Eck4_False_Easting;}

ossimEckert4Projection::Eck4_False_Easting

double Eck4_False_Easting

Definition: ossimEckert4Projection.h:90

◆ getFalseNorthing()

double ossimEckert4Projection::getFalseNorthing ( ) const

inlinevirtual

Returns: The false northing.

Reimplemented from ossimMapProjection.

Definition at line 55 of file ossimEckert4Projection.h.

55 {return Eck4_False_Northing;}

ossimEckert4Projection::Eck4_False_Northing

double Eck4_False_Northing

Definition: ossimEckert4Projection.h:91

◆ inverse()

ossimGpt ossimEckert4Projection::inverse ( const ossimDpt & projectedPoint ) const

virtual

Will take a point in meters and convert it to ground.

Implements ossimMapProjection.

Definition at line 91 of file ossimEckert4Projection.cpp.

References Convert_Eckert4_To_Geodetic(), DEG_PER_RAD, ossimMapProjection::theDatum, ossimDpt::x, and ossimDpt::y.

 {
    double lat  = 0.0;
    double lon = 0.0;
    
    Convert_Eckert4_To_Geodetic(eastingNorthing.x,
                                eastingNorthing.y,
                                &lat,
                                &lon);
    
    return ossimGpt(lat*DEG_PER_RAD, lon*DEG_PER_RAD, 0.0, theDatum);  
 }

◆ loadState()

bool ossimEckert4Projection::loadState	(	const ossimKeywordlist &	kwl,
		const char *	prefix = `0`
	)

virtual

Method to the load (recreate) the state of an object from a keyword list. Return true if ok or false on error.

Reimplemented from ossimMapProjection.

Definition at line 160 of file ossimEckert4Projection.cpp.

References Eck4_False_Easting, Eck4_False_Northing, ossimKeywordlist::find(), ossimMapProjection::loadState(), setDefaults(), STATIC_TYPE_NAME, ossimMapProjection::theFalseEastingNorthing, ossimKeywordNames::TYPE_KW, update(), ossimDpt::x, and ossimDpt::y.

 {
    bool flag = ossimMapProjection::loadState(kwl, prefix);
    
    const char* type          = kwl.find(prefix, ossimKeywordNames::TYPE_KW);
    
    setDefaults();
    
    if(ossimString(type) == STATIC_TYPE_NAME(ossimEckert4Projection))
    {
       Eck4_False_Easting  = theFalseEastingNorthing.x;
       Eck4_False_Northing = theFalseEastingNorthing.y;
    }
    
    update();
    
    return flag;
 }

◆ saveState()

bool ossimEckert4Projection::saveState	(	ossimKeywordlist &	kwl,
		const char *	prefix = `0`
	)		const

virtual

Method to save the state of an object to a keyword list. Return true if ok or false on error.

Reimplemented from ossimMapProjection.

Definition at line 155 of file ossimEckert4Projection.cpp.

References ossimMapProjection::saveState().

 {
    return ossimMapProjection::saveState(kwl, prefix);
 }

◆ Set_Eckert4_Parameters()

long ossimEckert4Projection::Set_Eckert4_Parameters	(	double	a,
		double	f,
		double	Central_Meridian,
		double	False_Easting,
		double	False_Northing
	)

private

The function Set_Eckert4_Parameters receives the ellipsoid parameters and Eckert IV projection parameters as inputs, and sets the corresponding state variables. If any errors occur, the error code(s) are returned by the function, otherwise ECK4_NO_ERROR is returned.

a : Semi-major axis of ellipsoid, in meters (input) f : Flattening of ellipsoid (input) Central_Meridian : Longitude in radians at the center of (input) the projection False_Easting : A coordinate value in meters assigned to the central meridian of the projection. (input) False_Northing : A coordinate value in meters assigned to the origin latitude of the projection (input)

Definition at line 185 of file ossimEckert4Projection.cpp.

References Eck4_a, Eck4_f, Eck4_False_Easting, Eck4_False_Northing, Eck4_Max_Easting, Eck4_Min_Easting, ECK4_NO_ERROR, Eck4_Origin_Long, es2, es4, es6, Ra0, and Ra1.

Referenced by update().

 { /* Begin Set_Eckert4_Parameters */
 /*
  * The function Set_Eckert4_Parameters receives the ellipsoid parameters and
  * projection parameters as inputs, and sets the corresponding state
  * variables.  If any errors occur, the error code(s) are returned by the 
  * function, otherwise ECK4_NO_ERROR is returned.
  *
  *    a                 : Semi-major axis of ellipsoid, in meters   (input)
  *    f                 : Flattening of ellipsoid                               (input)
  *    Central_Meridian  : Longitude in radians at the center of     (input)
  *                          the projection
  *    False_Easting     : A coordinate value in meters assigned to the
  *                          central meridian of the projection.     (input)
  *    False_Northing    : A coordinate value in meters assigned to the
  *                          origin latitude of the projection       (input)
  */
 
   double Ra;              /* Spherical radius */
 //  double inv_f = 1 / f;
   long Error_Code = ECK4_NO_ERROR;
 
 //   if (a <= 0.0)
 //   { /* Semi-major axis must be greater than zero */
 //     Error_Code |= ECK4_A_ERROR;
 //   }
 //   if ((inv_f < 250) || (inv_f > 350))
 //   { /* Inverse flattening must be between 250 and 350 */
 //     Error_Code |= ECK4_INV_F_ERROR;
 //   }
 //   if ((Central_Meridian < -PI) || (Central_Meridian > TWO_PI))
 //   { /* origin longitude out of range */
 //     Error_Code |= ECK4_CENT_MER_ERROR;
 //   }
   if (!Error_Code)
   { /* no errors */
     Eck4_a = a;
     Eck4_f = f;
     es2 = 2 * Eck4_f - Eck4_f * Eck4_f;
     es4 = es2 * es2;
     es6 = es4 * es2;
     /* spherical radius */
     Ra = Eck4_a * (1.0 - es2 / 6.0 - 17.0 * es4 / 360.0 - 67.0 * es6 / 3024.0);
     Ra0 = 0.4222382 * Ra;
     Ra1 = 1.3265004 * Ra;
 //     if (Central_Meridian > PI)
 //       Central_Meridian -= TWO_PI;
     Eck4_Origin_Long = Central_Meridian;
     Eck4_False_Easting = False_Easting;
     Eck4_False_Northing = False_Northing;
     if (Eck4_Origin_Long > 0)
     {
       Eck4_Max_Easting = 16808386.0;
       Eck4_Min_Easting = -16902288.0;
     }
     else if (Eck4_Origin_Long < 0)
     {
       Eck4_Max_Easting = 16902288.0;
       Eck4_Min_Easting = -16808386.0;
     }
     else
     {
       Eck4_Max_Easting = 16902288.0;
       Eck4_Min_Easting = -16902288.0;
     }
 
   } /* End if(!Error_Code) */
   return (Error_Code);
 } /* End Set_Eckert4_Parameters */

◆ setDefaults()

void ossimEckert4Projection::setDefaults ( )

Initialize all pramters to default and calls update for pre-computations.

Definition at line 146 of file ossimEckert4Projection.cpp.

References Eck4_Delta_Northing, Eck4_False_Easting, Eck4_False_Northing, Eck4_Max_Easting, and Eck4_Min_Easting.

Referenced by loadState(), and ossimEckert4Projection().

 {
    Eck4_Delta_Northing  = 8451144.0;
    Eck4_Max_Easting     = 16902288.0;
    Eck4_Min_Easting     = -16902288.0;
    Eck4_False_Easting   = 0.0;
    Eck4_False_Northing  = 0.0;
 }

◆ setFalseEasting()

void ossimEckert4Projection::setFalseEasting ( double falseEasting )

SetFalseEasting. The value is in meters. Update is then called so we can pre-compute paramters

Definition at line 126 of file ossimEckert4Projection.cpp.

References Eck4_False_Easting, and update().

 {
    Eck4_False_Easting = falseEasting;
    update();
 }

◆ setFalseEastingNorthing()

void ossimEckert4Projection::setFalseEastingNorthing	(	double	falseEasting,
		double	falseNorthing
	)

Sets both false easting and northing values. The values are expected to be in meters. Update is then called so we can pre-compute paramters

Definition at line 138 of file ossimEckert4Projection.cpp.

References Eck4_False_Easting, Eck4_False_Northing, and update().

 {
    Eck4_False_Easting = falseEasting;
    Eck4_False_Northing = falseNorthing;
    update();
 }

◆ setFalseNorthing()

void ossimEckert4Projection::setFalseNorthing ( double falseNorthing )

SetFalseNorthing. The value is in meters. Update is then called so we can pre-compute paramters

Definition at line 132 of file ossimEckert4Projection.cpp.

References Eck4_False_Northing, and update().

 {
    Eck4_False_Northing = falseNorthing;
    update();
 }

◆ update()

void ossimEckert4Projection::update ( )

virtual

Reimplemented from ossimMapProjection.

Definition at line 76 of file ossimEckert4Projection.cpp.

References Eck4_False_Easting, Eck4_False_Northing, ossimEllipsoid::getA(), ossimEllipsoid::getFlattening(), ossimGpt::lonr(), Set_Eckert4_Parameters(), ossimMapProjection::theEllipsoid, ossimMapProjection::theFalseEastingNorthing, ossimMapProjection::theOrigin, ossimMapProjection::update(), ossimDpt::x, and ossimDpt::y.

Referenced by loadState(), ossimEckert4Projection(), setFalseEasting(), setFalseEastingNorthing(), and setFalseNorthing().

 {   
    
    Set_Eckert4_Parameters(theEllipsoid.getA(),
                           theEllipsoid.getFlattening(),
                           theOrigin.lonr(),
                           Eck4_False_Easting,
                           Eck4_False_Northing);
 
    theFalseEastingNorthing.x = Eck4_False_Easting;
    theFalseEastingNorthing.y = Eck4_False_Northing;
 
    ossimMapProjection::update();
 }

Member Data Documentation

◆ Eck4_a

double ossimEckert4Projection::Eck4_a

mutableprivate

Definition at line 79 of file ossimEckert4Projection.h.

Referenced by Get_Eckert4_Parameters(), and Set_Eckert4_Parameters().

◆ Eck4_Delta_Northing

double ossimEckert4Projection::Eck4_Delta_Northing

mutableprivate

Definition at line 92 of file ossimEckert4Projection.h.

Referenced by ossimEckert4Projection(), and setDefaults().

◆ Eck4_f

double ossimEckert4Projection::Eck4_f

mutableprivate

Definition at line 80 of file ossimEckert4Projection.h.

Referenced by Get_Eckert4_Parameters(), and Set_Eckert4_Parameters().

◆ Eck4_False_Easting

double ossimEckert4Projection::Eck4_False_Easting

mutableprivate

Definition at line 90 of file ossimEckert4Projection.h.

Referenced by Convert_Eckert4_To_Geodetic(), Convert_Geodetic_To_Eckert4(), Get_Eckert4_Parameters(), loadState(), ossimEckert4Projection(), Set_Eckert4_Parameters(), setDefaults(), setFalseEasting(), setFalseEastingNorthing(), and update().

◆ Eck4_False_Northing

double ossimEckert4Projection::Eck4_False_Northing

mutableprivate

Definition at line 91 of file ossimEckert4Projection.h.

Referenced by Convert_Eckert4_To_Geodetic(), Convert_Geodetic_To_Eckert4(), Get_Eckert4_Parameters(), loadState(), ossimEckert4Projection(), Set_Eckert4_Parameters(), setDefaults(), setFalseEastingNorthing(), setFalseNorthing(), and update().

◆ Eck4_Max_Easting

double ossimEckert4Projection::Eck4_Max_Easting

mutableprivate

Definition at line 93 of file ossimEckert4Projection.h.

Referenced by ossimEckert4Projection(), Set_Eckert4_Parameters(), and setDefaults().

◆ Eck4_Min_Easting

double ossimEckert4Projection::Eck4_Min_Easting

mutableprivate

Definition at line 94 of file ossimEckert4Projection.h.

Referenced by ossimEckert4Projection(), Set_Eckert4_Parameters(), and setDefaults().

◆ Eck4_Origin_Long

double ossimEckert4Projection::Eck4_Origin_Long

mutableprivate

Definition at line 89 of file ossimEckert4Projection.h.

Referenced by Convert_Eckert4_To_Geodetic(), Convert_Geodetic_To_Eckert4(), Get_Eckert4_Parameters(), and Set_Eckert4_Parameters().

◆ es2

double ossimEckert4Projection::es2

mutableprivate

Definition at line 81 of file ossimEckert4Projection.h.

Referenced by Set_Eckert4_Parameters().

◆ es4

double ossimEckert4Projection::es4

mutableprivate

Definition at line 82 of file ossimEckert4Projection.h.

Referenced by Set_Eckert4_Parameters().

◆ es6

double ossimEckert4Projection::es6

mutableprivate

Definition at line 83 of file ossimEckert4Projection.h.

Referenced by Set_Eckert4_Parameters().

◆ Ra0

double ossimEckert4Projection::Ra0

mutableprivate

Definition at line 85 of file ossimEckert4Projection.h.

Referenced by Convert_Eckert4_To_Geodetic(), Convert_Geodetic_To_Eckert4(), and Set_Eckert4_Parameters().

◆ Ra1

double ossimEckert4Projection::Ra1

mutableprivate

Definition at line 86 of file ossimEckert4Projection.h.

Referenced by Convert_Eckert4_To_Geodetic(), Convert_Geodetic_To_Eckert4(), and Set_Eckert4_Parameters().

The documentation for this class was generated from the following files:

Public Member Functions

Private Member Functions

Private Attributes

Additional Inherited Members

Detailed Description

Constructor & Destructor Documentation

◆ ossimEckert4Projection() [1/2]

◆ ossimEckert4Projection() [2/2]

◆ ~ossimEckert4Projection()

Member Function Documentation

◆ Convert_Eckert4_To_Geodetic()

◆ Convert_Geodetic_To_Eckert4()

◆ dup()

◆ forward()

◆ Get_Eckert4_Parameters()

◆ getFalseEasting()

◆ getFalseNorthing()

◆ inverse()

◆ loadState()

◆ saveState()

◆ Set_Eckert4_Parameters()

◆ setDefaults()

◆ setFalseEasting()

◆ setFalseEastingNorthing()

◆ setFalseNorthing()

◆ update()

Member Data Documentation

◆ Eck4_a

◆ Eck4_Delta_Northing

◆ Eck4_f

◆ Eck4_False_Easting

◆ Eck4_False_Northing

◆ Eck4_Max_Easting

◆ Eck4_Min_Easting

◆ Eck4_Origin_Long

◆ es2

◆ es4

◆ es6

◆ Ra0

◆ Ra1