//******************************************************************* // // License: See top level LICENSE.txt file. // // Author: Garrett Potts (gpotts@imagelinks.com) // // Description: // //******************************************************************* // $Id: ossimGnomonicProjection.h 17815 2010-08-03 13:23:14Z dburken $ #ifndef ossimGnomonicProjection_HEADER #define ossimGnomonicProjection_HEADER #include class OSSIMDLLEXPORT ossimGnomonicProjection : public ossimMapProjection { public: ossimGnomonicProjection(const ossimEllipsoid& ellipsoid = ossimEllipsoid(), const ossimGpt& origin = ossimGpt()); ossimGnomonicProjection(const ossimEllipsoid& ellipsoid, const ossimGpt& origin, const double falseEasting, const double falseNorthing); ~ossimGnomonicProjection(){} virtual ossimObject *dup()const { return new ossimGnomonicProjection(*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); void setDefaults(); double getFalseEasting()const{return Gnom_False_Easting;} double getFalseNorthing()const{return Gnom_False_Northing;} /*! * 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); protected: //__________________________GEOTRANS________________________ mutable double Gnom_a; /* Semi-major axis of ellipsoid in meters */ mutable double Gnom_f; /* Flattening of ellipsoid */ mutable double Ra; /* Spherical Radius */ mutable double Sin_Gnom_Origin_Lat; mutable double Cos_Gnom_Origin_Lat; /* Gnomonic projection Parameters */ mutable double Gnom_Origin_Lat; /* Latitude of origin in radians */ mutable double Gnom_Origin_Long; /* Longitude of origin in radians */ mutable double Gnom_False_Northing; /* False northing in meters */ mutable double Gnom_False_Easting; /* False easting in meters */ mutable double abs_Gnom_Origin_Lat; mutable double Gnom_Delta_Northing; mutable double Gnom_Delta_Easting; /* * The function Set_Gnomonic_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 GNOM_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_Gnomonic_Parameters(double a, double f, double Origin_Latitude, double Central_Meridian, double False_Easting, double False_Northing); /*! * The function Get_Gnomonic_Parameters returns the current ellipsoid * parameters and Gnomonic 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_Gnomonic_Parameters(double *a, double *f, double *Origin_Latitude, double *Central_Meridian, double *False_Easting, double *False_Northing)const; /*! * The function Convert_Geodetic_To_Gnomonic converts geodetic (latitude and * longitude) coordinates to Gnomonic projection (easting and northing) * coordinates, according to the current ellipsoid and Gnomonic projection * parameters. If any errors occur, the error code(s) are returned by the * function, otherwise GNOM_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_Gnomonic (double Latitude, double Longitude, double *Easting, double *Northing)const; /*! * The function Convert_Gnomonic_To_Geodetic converts Gnomonic projection * (easting and northing) coordinates to geodetic (latitude and longitude) * coordinates, according to the current ellipsoid and Gnomonic projection * coordinates. If any errors occur, the error code(s) are returned by the * function, otherwise GNOM_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_Gnomonic_To_Geodetic(double Easting, double Northing, double *Latitude, double *Longitude)const; TYPE_DATA }; #endif