//******************************************************************* // // License: See top level LICENSE.txt file. // // Author: Garrett Potts // // Description: // // Calls Geotrans Cassini projection code. //******************************************************************* // $Id: ossimCassiniProjection.h 17815 2010-08-03 13:23:14Z dburken $ #ifndef ossimCassiniProjection_HEADER #define ossimCassiniProjection_HEADER #include class OSSIMDLLEXPORT ossimCassiniProjection : public ossimMapProjection { public: ossimCassiniProjection(const ossimEllipsoid& ellipsoid = ossimEllipsoid(), const ossimGpt& origin = ossimGpt()); ossimCassiniProjection(const ossimEllipsoid& ellipsoid, const ossimGpt& origin, const double falseEasting, const double falseNorthing); ~ossimCassiniProjection(){} virtual ossimObject *dup()const{return new ossimCassiniProjection(*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 Cass_False_Easting;} double getFalseNorthing()const{return Cass_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: //_____________________GETRANS STUFF_____________________ mutable double Cass_a; /* Semi-major axis of ellipsoid in meters */ mutable double Cass_f; /* Flattening of ellipsoid */ mutable double es2; /* Eccentricity (0.08181919084262188000) squared */ mutable double es4; /* es2 * es2 */ mutable double es6; /* es4 * es2 */ mutable double M0; mutable double c0; /* 1 - es2 / 4.0 - 3.0 * es4 / 64.0 - 5.0 * es6 / 256.0 */ mutable double c1; /* 3.0 * es2 / 8.0 + 3.0 * es4 / 32.0 + 45.0 * es6 / 1024.0 */ mutable double c2; /* 15.0 * es4 / 256.0 + 45.0 * es6 / 1024.0 */ mutable double c3; /* 35.0 * es6 / 3072.0 */ mutable double One_Minus_es2; /* 1.0 - es2 */ mutable double a0; /* 3.0 * e1 / 2.0 - 27.0 * e3 / 32.0 */ mutable double a1; /* 21.0 * e2 / 16.0 - 55.0 * e4 / 32.0 */ mutable double a2; /* 151.0 * e3 / 96.0 */ mutable double a3; /* 1097.0 * e4 /512.0 */ /* Cassini projection Parameters */ mutable double Cass_Origin_Lat; /* Latitude of origin in radians */ mutable double Cass_Origin_Long; /* Longitude of origin in radians */ mutable double Cass_False_Northing; /* False northing in meters */ mutable double Cass_False_Easting; /* False easting in meters */ /* Maximum variance for easting and northing values for WGS 84. */ mutable double Cass_Min_Easting; mutable double Cass_Max_Easting; mutable double Cass_Min_Northing; mutable double Cass_Max_Northing; /*! * The function Set_Cassini_Parameters receives the ellipsoid parameters and * Cassini projcetion parameters as inputs, and sets the corresponding state * variables. If any errors occur, the error code(s) are returned by the * function, otherwise CASS_NO_ERROR is returned. * * a : Semi-major axis of ellipsoid, in meters (input) * f : Flattening of ellipsoid (input) * Origin_Latitude : Latitude in radians at which the (input) * point scale factor is 1.0 * 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_Cassini_Parameters(double a, double f, double Origin_Latitude, double Central_Meridian, double False_Easting, double False_Northing); /*! * The function Get_Cassini_Parameters returns the current ellipsoid * parameters, and Cassini projection parameters. * * a : Semi-major axis of ellipsoid, in meters (output) * f : Flattening of ellipsoid (output) * Origin_Latitude : Latitude in radians at which the (output) * point scale factor is 1.0 * 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_Cassini_Parameters(double *a, double *f, double *Origin_Latitude, double *Central_Meridian, double *False_Easting, double *False_Northing)const; /*! * The function Convert_Geodetic_To_Cassini converts geodetic (latitude and * longitude) coordinates to Cassini projection easting, and northing * coordinates, according to the current ellipsoid and Cassini projection * parameters. If any errors occur, the error code(s) are returned by the * function, otherwise CASS_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_Cassini (double Latitude, double Longitude, double *Easting, double *Northing)const; /*! * The function Convert_Cassini_To_Geodetic converts Cassini projection * easting and northing coordinates to geodetic (latitude and longitude) * coordinates, according to the current ellipsoid and Cassini projection * coordinates. If any errors occur, the error code(s) are returned by the * function, otherwise CASS_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_Cassini_To_Geodetic(double Easting, double Northing, double *Latitude, double *Longitude)const; TYPE_DATA }; #endif