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# Y:/msp/devkits/temp_geotrans/master/geotrans3.1/CCS/src/dtcc/CoordinateSystems/gnomonic/Gnomonic.h

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    00001 // CLASSIFICATION: UNCLASSIFIED
    00002
    00003 #ifndef Gnomonic_H
    00004 #define Gnomonic_H
    00005
    00006 /***************************************************************************/
    00007 /* RSC IDENTIFIER: GNOMONIC
    00008  *
    00009  * ABSTRACT
    00010  *
    00011  *    This component provides conversions between Geodetic coordinates
    00012  *    (latitude and longitude in radians) and Gnomonic
    00013  *    projection coordinates (easting and northing in meters).  This projection
    00014  *    employs a spherical Earth model.  The spherical radius used is the radius
    00015  *    of the sphere having the same area as the ellipsoid.
    00016  *
    00017  * ERROR HANDLING
    00018  *
    00019  *    This component checks parameters for valid values.  If an invalid value
    00020  *    is found the error code is combined with the current error code using
    00021  *    the bitwise or.  This combining allows multiple error codes to be
    00022  *    returned. The possible error codes are:
    00023  *
    00024  *       GNOM_NO_ERROR           : No errors occurred in function
    00025  *       GNOM_LAT_ERROR          : Latitude outside of valid range
    00026  *                                     (-90 to 90 degrees)
    00027  *       GNOM_LON_ERROR          : Longitude outside of valid range
    00028  *                                     (-180 to 360 degrees)
    00029  *       GNOM_EASTING_ERROR      : Easting outside of valid range
    00030  *                                     (depends on ellipsoid and projection
    00031  *                                     parameters)
    00032  *       GNOM_NORTHING_ERROR     : Northing outside of valid range
    00033  *                                     (depends on ellipsoid and projection
    00034  *                                     parameters)
    00035  *       GNOM_ORIGIN_LAT_ERROR   : Origin latitude outside of valid range
    00036  *                                     (-90 to 90 degrees)
    00037  *       GNOM_CENT_MER_ERROR     : Central meridian outside of valid range
    00038  *                                     (-180 to 360 degrees)
    00039  *       GNOM_A_ERROR            : Semi-major axis less than or equal to zero
    00040  *       GNOM_INV_F_ERROR        : Inverse flattening outside of valid range
    00041  *                                                                                         (250 to 350)
    00042  *
    00043  *
    00044  * REUSE NOTES
    00045  *
    00046  *    GNOMONIC is intended for reuse by any application that
    00047  *    performs a Gnomonic projection or its inverse.
    00048  *
    00049  * REFERENCES
    00050  *
    00051  *    Further information on GNOMONIC can be found in the Reuse Manual.
    00052  *
    00053  *    GNOMONIC originated from:     U.S. Army Topographic Engineering Center
    00054  *                                  Geospatial Information Division
    00055  *                                  7701 Telegraph Road
    00056  *                                  Alexandria, VA  22310-3864
    00057  *
    00058  * LICENSES
    00059  *
    00060  *    None apply to this component.
    00061  *
    00062  * RESTRICTIONS
    00063  *
    00064  *    GNOMONIC has no restrictions.
    00065  *
    00066  * ENVIRONMENT
    00067  *
    00068  *    GNOMONIC was tested and certified in the following environments:
    00069  *
    00070  *    1. Solaris 2.5 with GCC, version 2.8.1
    00071  *    2. MSDOS with MS Visual C++, version 6
    00072  *
    00073  * MODIFICATIONS
    00074  *
    00075  *    Date              Description
    00076  *    ----              -----------
    00077  *    05-22-00          Original Code
    00078  *    03-05-07          Original C++ Code
    00079  *
    00080  *
    00081  */
    00082
    00083
    00084 #include "CoordinateSystem.h"
    00085
    00086
    00087 namespace MSP
    00088 {
    00089   namespace CCS
    00090   {
    00091     class MapProjection4Parameters;
    00092     class MapProjectionCoordinates;
    00093     class GeodeticCoordinates;
    00094
    00095
    00096     /***************************************************************************/
    00097     /*
    00098      *                              DEFINES
    00099      */
    00100
    00101     class Gnomonic : public CoordinateSystem
    00102     {
    00103     public:
    00104
    00105       /*
    00106        * The constructor receives the ellipsoid parameters and
    00107        * projection parameters as inputs, and sets the corresponding state
    00108        * variables.  If any errors occur, an exception is thrown with a description
    00109        * of the error.
    00110        *
    00111        *    ellipsoidSemiMajorAxis  : Semi-major axis of ellipsoid, in meters   (input)
    00112        *    ellipsoidFlattening     : Flattening of ellipsoid                                                   (input)
    00113        *    centralMeridian         : Longitude in radians at the center of     (input)
    00114        *                              the projection
    00115        *    originLatitude          : Latitude in radians at which the          (input)
    00116        *                              point scale factor is 1.0
    00117        *    falseEasting            : A coordinate value in meters assigned to the
    00118        *                              central meridian of the projection.       (input)
    00119        *    falseNorthing           : A coordinate value in meters assigned to the
    00120        *                              origin latitude of the projection         (input)
    00121        */
    00122
    00123             Gnomonic( double ellipsoidSemiMajorAxis, double ellipsoidFlattening, double centralMeridian, double originLatitude, double falseEasting, double falseNorthing );
    00124
    00125
    00126       Gnomonic( const Gnomonic &g );
    00127
    00128
    00129             ~Gnomonic( void );
    00130
    00131
    00132       Gnomonic& operator=( const Gnomonic &g );
    00133
    00134
    00135       /*
    00136        * The function getParameters returns the current ellipsoid
    00137        * parameters and Gnomonic projection parameters.
    00138        *
    00139        *    ellipsoidSemiMajorAxis  : Semi-major axis of ellipsoid, in meters   (output)
    00140        *    ellipsoidFlattening     : Flattening of ellipsoid                                                   (output)
    00141        *    centralMeridian         : Longitude in radians at the center of     (output)
    00142        *                              the projection
    00143        *    originLatitude          : Latitude in radians at which the          (output)
    00144        *                              point scale factor is 1.0
    00145        *    falseEasting            : A coordinate value in meters assigned to the
    00146        *                              central meridian of the projection.       (output)
    00147        *    falseNorthing           : A coordinate value in meters assigned to the
    00148        *                              origin latitude of the projection         (output)
    00149        */
    00150
    00151       MapProjection4Parameters* getParameters() const;
    00152
    00153
    00154       /*
    00155        * The function convertFromGeodetic converts geodetic (latitude and
    00156        * longitude) coordinates to Gnomonic projection (easting and northing)
    00157        * coordinates, according to the current ellipsoid and Gnomonic projection
    00158        * parameters.  If any errors occur, an exception is thrown with a description
    00159        * of the error.
    00160        *
    00161        *    longitude         : Longitude (lambda) in radians       (input)
    00162        *    latitude          : Latitude (phi) in radians           (input)
    00163        *    easting           : Easting (X) in meters               (output)
    00164        *    northing          : Northing (Y) in meters              (output)
    00165        */
    00166
    00167       MSP::CCS::MapProjectionCoordinates* convertFromGeodetic( MSP::CCS::GeodeticCoordinates* geodeticCoordinates );
    00168
    00169
    00170       /*
    00171        * The function convertToGeodetic converts Gnomonic projection
    00172        * (easting and northing) coordinates to geodetic (latitude and longitude)
    00173        * coordinates, according to the current ellipsoid and Gnomonic projection
    00174        * coordinates.  If any errors occur, an exception is thrown with a description
    00175        * of the error.
    00176        *
    00177        *    easting           : Easting (X) in meters                  (input)
    00178        *    northing          : Northing (Y) in meters                 (input)
    00179        *    longitude         : Longitude (lambda) in radians          (output)
    00180        *    latitude          : Latitude (phi) in radians              (output)
    00181        */
    00182
    00183       MSP::CCS::GeodeticCoordinates* convertToGeodetic( MSP::CCS::MapProjectionCoordinates* mapProjectionCoordinates );
    00184
    00185     private:
    00186
    00187       /* Ellipsoid Parameters, default to WGS 84 */
    00188       double Ra;                /* Spherical Radius */
    00189       double Sin_Gnom_Origin_Lat;
    00190       double Cos_Gnom_Origin_Lat;
    00191
    00192       /* Gnomonic projection Parameters */
    00193       double Gnom_Origin_Lat;               /* Latitude of origin in radians */
    00194       double Gnom_Origin_Long;              /* Longitude of origin in radians */
    00195       double Gnom_False_Northing;           /* False northing in meters */
    00196       double Gnom_False_Easting;            /* False easting in meters */
    00197       double abs_Gnom_Origin_Lat;
    00198
    00199       double Gnom_Delta_Northing;
    00200       double Gnom_Delta_Easting;
    00201
    00202     };
    00203   }
    00204 }
    00205
    00206 #endif
    00207
    00208
    00209 // CLASSIFICATION: UNCLASSIFIED