//******************************************************************* // // License: See top level LICENSE.txt file. // // Author: Garrett Potts (gpotts@imagelinks.com) // // Description: // // Calls Geotrans Mercator projection code. //******************************************************************* // $Id: ossimMercatorProjection.h 17815 2010-08-03 13:23:14Z dburken $ #ifndef ossimMercatorProjection_HEADER #define ossimMercatorProjection_HEADER #include class OSSIMDLLEXPORT ossimMercatorProjection : public ossimMapProjection { public: ossimMercatorProjection(const ossimEllipsoid& ellipsoid = ossimEllipsoid(), const ossimGpt& origin = ossimGpt()); ossimMercatorProjection(const ossimEllipsoid& ellipsoid, const ossimGpt& origin, double falseEasting, double falseNorthing, double scaleFactor); ~ossimMercatorProjection(){} virtual ossimObject *dup()const{return new ossimMercatorProjection(*this);} virtual ossimGpt inverse(const ossimDpt &eastingNorthing)const; virtual ossimDpt forward(const ossimGpt &latLon)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); /*! * sets the scale. */ void setScaleFactor(double scaleFactor); /*! * Allows one to set all parameters for this projections. parallels are in * degrees and easting northings are in meters. * Update is then called so we can pre-compute paramters. */ void setParameters(double falseEasting, double falseNorthing, double scaleFactor); void setDefaults(); double getFalseEasting()const{return Merc_False_Easting;} double getFalseNorthing()const{return Merc_False_Northing;} double getScaleFactor()const{return Merc_Scale_Factor;} /*! * 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); //! Returns TRUE if principal parameters are within epsilon tolerance. virtual bool operator==(const ossimProjection& projection) const; private: //_________________GEOTRANS STUFF____________________________ mutable double Merc_a; /* Semi-major axis of ellipsoid in meters */ mutable double Merc_f; /* Flattening of ellipsoid */ mutable double Merc_e; /* Eccentricity of ellipsoid */ mutable double Merc_es; /* Eccentricity squared */ /* Mercator projection Parameters */ mutable double Merc_Origin_Lat; /* Latitude of origin in radians */ mutable double Merc_Origin_Long; /* Longitude of origin in radians */ mutable double Merc_False_Northing; /* False northing in meters */ mutable double Merc_False_Easting; /* False easting in meters */ mutable double Merc_Scale_Factor; /* Scale factor */ /* Isometric to geodetic latitude parameters, default to WGS 84 */ mutable double Merc_ab; mutable double Merc_bb; mutable double Merc_cb; mutable double Merc_db; /* Maximum variance for easting and northing values for WGS 84. */ mutable double Merc_Delta_Easting; mutable double Merc_Delta_Northing; bool theSphericalFlag; /*! * The function Set_Mercator_Parameters receives the ellipsoid parameters and * Mercator projcetion parameters as inputs, and sets the corresponding state * variables. It calculates and returns the scale factor. If any errors * occur, the error code(s) are returned by the function, otherwise * MERC_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) * Scale_Factor : Multiplier which reduces distances in the * projection to the actual distance on the * ellipsoid (output) */ long Set_Mercator_Parameters(double a, double f, double Origin_Latitude, double Central_Meridian, double False_Easting, double False_Northing, double *Scale_Factor); /*! * The function Get_Mercator_Parameters returns the current ellipsoid * parameters, Mercator projection parameters, and scale factor. * * 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) * Scale_Factor : Multiplier which reduces distances in the * projection to the actual distance on the * ellipsoid (output) */ void Get_Mercator_Parameters(double *a, double *f, double *Origin_Latitude, double *Central_Meridian, double *False_Easting, double *False_Northing, double *Scale_Factor)const; /*! * The function Convert_Geodetic_To_Mercator converts geodetic (latitude and * longitude) coordinates to Mercator projection easting, and northing * coordinates, according to the current ellipsoid and Mercator projection * parameters. If any errors occur, the error code(s) are returned by the * function, otherwise MERC_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_Mercator (double Latitude, double Longitude, double *Easting, double *Northing)const; /*! * The function Convert_Mercator_To_Geodetic converts Mercator projection * easting and northing coordinates to geodetic (latitude and longitude) * coordinates, according to the current ellipsoid and Mercator projection * coordinates. If any errors occur, the error code(s) are returned by the * function, otherwise MERC_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_Mercator_To_Geodetic(double Easting, double Northing, double *Latitude, double *Longitude)const; TYPE_DATA }; #endif