//******************************************************************* // // License: See top level LICENSE.txt file. // // Author: Garrett Potts // // Description: // // Calls Geotrans Eckert4 projection code. //******************************************************************* // $Id: ossimEckert4Projection.h 17815 2010-08-03 13:23:14Z dburken $ #ifndef ossimEcker4Projection_HEADER #define ossimEcker4Projection_HEADER #include class OSSIMDLLEXPORT ossimEckert4Projection : public ossimMapProjection { public: 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 { return new ossimEckert4Projection(*this); } virtual ossimDpt forward(const ossimGpt &worldPoint) const; virtual ossimGpt inverse(const ossimDpt &projectedPoint) const; virtual void update(); /*! * SetFalseEasting. The value is in meters. * Update is then called so we can pre-compute paramters */ void setFalseEasting(double falseEasting); /*! * SetFalseNorthing. The value is in meters. * Update is then called so we can pre-compute paramters */ void setFalseNorthing(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 */ void setFalseEastingNorthing(double falseEasting, double falseNorthing); double getFalseEasting()const{return Eck4_False_Easting;} double getFalseNorthing()const{return Eck4_False_Northing;} /*! * Initialize all pramters to default and calls update for * pre-computations. */ void setDefaults(); /*! * Method to save the state of an object to a keyword list. * Return true if ok or false on error. */ virtual bool saveState(ossimKeywordlist& kwl, const char* prefix=0)const; /*! * Method to the load (recreate) the state of an object from a keyword * list. Return true if ok or false on error. */ virtual bool loadState(const ossimKeywordlist& kwl, const char* prefix=0); private: /* Ellipsoid Parameters, default to WGS 84 */ mutable double Eck4_a; /* Semi-major axis of ellipsoid in meters */ mutable double Eck4_f; /* Flattening of ellipsoid */ mutable double es2; /* Eccentricity (0.08181919084262188000) squared */ mutable double es4; /* es2 * es2 */ mutable double es6; /* es4 * es2 */ mutable double Ra0; /* 0.4222382 * Sperical Radius (6371007.1810824) */ mutable double Ra1; /* 1.3265004 * Sperical Radius (6371007.1810824) */ /* Eckert4 projection Parameters */ mutable double Eck4_Origin_Long; /* Longitude of origin in radians */ mutable double Eck4_False_Easting; mutable double Eck4_False_Northing; mutable double Eck4_Delta_Northing; mutable double Eck4_Max_Easting; mutable double Eck4_Min_Easting; /*! * 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) */ long Set_Eckert4_Parameters(double a, double f, double Central_Meridian, double False_Easting, double False_Northing); /*! * 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) */ void Get_Eckert4_Parameters(double *a, double *f, double *Central_Meridian, double *False_Easting, double *False_Northing)const; /*! * 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) */ long Convert_Geodetic_To_Eckert4 (double Latitude, double Longitude, double *Easting, double *Northing)const; /*! * 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) */ long Convert_Eckert4_To_Geodetic(double Easting, double Northing, double *Latitude, double *Longitude)const; /*! * RTTI information */ TYPE_DATA }; #endif