- Main Page
- Namespaces
- Classes
- Files

- File List
- File Members

# Y:/msp/devkits/temp_geotrans/master/geotrans3.1/CCS/src/dtcc/CoordinateSystems/eckert6/Eckert6.h

Go to the documentation of this file.

    00001 // CLASSIFICATION: UNCLASSIFIED
    00002
    00003 #ifndef Eckert6_H
    00004 #define Eckert6_H
    00005
    00006 /***************************************************************************/
    00007 /* RSC IDENTIFIER: ECKERT6
    00008  *
    00009  * ABSTRACT
    00010  *
    00011  *    This component provides conversions between Geodetic coordinates
    00012  *    (latitude and longitude in radians) and Eckert VI projection coordinates
    00013  *    (easting and northing in meters).  This projection employs a spherical
    00014  *    Earth model.  The spherical radius used is the radius of the sphere
    00015  *    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  *          ECK6_NO_ERROR           : No errors occurred in function
    00025  *          ECK6_LAT_ERROR          : Latitude outside of valid range
    00026  *                                      (-90 to 90 degrees)
    00027  *          ECK6_LON_ERROR          : Longitude outside of valid range
    00028  *                                      (-180 to 360 degrees)
    00029  *          ECK6_EASTING_ERROR      : Easting outside of valid range
    00030  *                                      (False_Easting +/- ~18,000,000 m,
    00031  *                                       depending on ellipsoid parameters)
    00032  *          ECK6_NORTHING_ERROR     : Northing outside of valid range
    00033  *                                      (False_Northing +/- 0 to ~8,000,000 m,
    00034  *                                       depending on ellipsoid parameters)
    00035  *          ECK6_CENT_MER_ERROR     : Central meridian outside of valid range
    00036  *                                      (-180 to 360 degrees)
    00037  *          ECK6_A_ERROR            : Semi-major axis less than or equal to zero
    00038  *          ECK6_INV_F_ERROR        : Inverse flattening outside of valid range
    00039  *                                                                                          (250 to 350)
    00040  *
    00041  * REUSE NOTES
    00042  *
    00043  *    ECKERT6 is intended for reuse by any application that performs a
    00044  *    Eckert VI projection or its inverse.
    00045  *
    00046  * REFERENCES
    00047  *
    00048  *    Further information on ECKERT6 can be found in the Reuse Manual.
    00049  *
    00050  *    ECKERT6 originated from :  U.S. Army Topographic Engineering Center
    00051  *                                Geospatial Information Division
    00052  *                                7701 Telegraph Road
    00053  *                                Alexandria, VA  22310-3864
    00054  *
    00055  * LICENSES
    00056  *
    00057  *    None apply to this component.
    00058  *
    00059  * RESTRICTIONS
    00060  *
    00061  *    ECKERT6 has no restrictions.
    00062  *
    00063  * ENVIRONMENT
    00064  *
    00065  *    ECKERT6 was tested and certified in the following environments:
    00066  *
    00067  *    1. Solaris 2.5 with GCC 2.8.1
    00068  *    2. MS Windows 95 with MS Visual C++ 6
    00069  *
    00070  * MODIFICATIONS
    00071  *
    00072  *    Date              Description
    00073  *    ----              -----------
    00074  *    04-16-99          Original Code
    00075  *    03-06-07          Original C++ Code
    00076  *
    00077  */
    00078
    00079
    00080 #include "CoordinateSystem.h"
    00081
    00082
    00083 namespace MSP
    00084 {
    00085   namespace CCS
    00086   {
    00087     class MapProjection3Parameters;
    00088     class MapProjectionCoordinates;
    00089     class GeodeticCoordinates;
    00090
    00091
    00092     /***************************************************************************/
    00093     /*
    00094      *                              DEFINES
    00095      */
    00096
    00097     class Eckert6 : public CoordinateSystem
    00098     {
    00099     public:
    00100
    00101       /*
    00102        * The constructor receives the ellipsoid parameters and
    00103        * Eckert VI projection parameters as inputs, and sets the corresponding state
    00104        * variables.  If any errors occur, an exception is thrown with a description
    00105        * of the error.
    00106        *
    00107        *    ellipsoidSemiMajorAxis  : Semi-major axis of ellipsoid, in meters   (input)
    00108        *    ellipsoidFlattening     : Flattening of ellipsoid                                                   (input)
    00109        *    centralMeridian         : Longitude in radians at the center of     (input)
    00110        *                              the projection
    00111        *    falseEasting            : A coordinate value in meters assigned to the
    00112        *                              central meridian of the projection.       (input)
    00113        *    falseNorthing           : A coordinate value in meters assigned to the
    00114        *                              origin latitude of the projection         (input)
    00115        */
    00116
    00117             Eckert6( double ellipsoidSemiMajorAxis, double ellipsoidFlattening, double centralMeridian, double falseEasting, double falseNorthing );
    00118
    00119
    00120       Eckert6( const Eckert6 &e );
    00121
    00122
    00123             ~Eckert6( void );
    00124
    00125
    00126       Eckert6& operator=( const Eckert6 &e );
    00127
    00128
    00129       /*
    00130        * The function getParameters returns the current ellipsoid
    00131        * parameters and Eckert VI projection parameters.
    00132        *
    00133        *    ellipsoidSemiMajorAxis  : Semi-major axis of ellipsoid, in meters   (output)
    00134        *    ellipsoidFlattening     : Flattening of ellipsoid                                                   (output)
    00135        *    centralMeridian         : Longitude in radians at the center of     (output)
    00136        *                              the projection
    00137        *    falseEasting            : A coordinate value in meters assigned to the
    00138        *                              central meridian of the projection.       (output)
    00139        *    falseNorthing           : A coordinate value in meters assigned to the
    00140        *                              origin latitude of the projection         (output)
    00141        */
    00142
    00143       MapProjection3Parameters* getParameters() const;
    00144
    00145
    00146       /*
    00147        * The function convertFromGeodetic converts geodetic (latitude and
    00148        * longitude) coordinates to Eckert VI projection (easting and northing)
    00149        * coordinates, according to the current ellipsoid and Eckert VI projection
    00150        * parameters.  If any errors occur, an exception is thrown with a description
    00151        * of the error.
    00152        *
    00153        *    longitude         : Longitude (lambda) in radians       (input)
    00154        *    latitude          : Latitude (phi) in radians           (input)
    00155        *    easting           : Easting (X) in meters               (output)
    00156        *    northing          : Northing (Y) in meters              (output)
    00157        */
    00158
    00159       MSP::CCS::MapProjectionCoordinates* convertFromGeodetic( MSP::CCS::GeodeticCoordinates* geodeticCoordinates );
    00160
    00161
    00162       /*
    00163        * The function convertToGeodetic converts Eckert VI projection
    00164        * (easting and northing) coordinates to geodetic (latitude and longitude)
    00165        * coordinates, according to the current ellipsoid and Eckert VI projection
    00166        * coordinates.  If any errors occur, an exception is thrown with a description
    00167        * of the error.
    00168        *
    00169        *    easting           : Easting (X) in meters                  (input)
    00170        *    northing          : Northing (Y) in meters                 (input)
    00171        *    longitude         : Longitude (lambda) in radians          (output)
    00172        *    latitude          : Latitude (phi) in radians              (output)
    00173        */
    00174
    00175       MSP::CCS::GeodeticCoordinates* convertToGeodetic( MSP::CCS::MapProjectionCoordinates* mapProjectionCoordinates );
    00176
    00177     private:
    00178
    00179       /* Ellipsoid Parameters, default to WGS 84 */
    00180       double es2;                             /* Eccentricity (0.08181919084262188000) squared */
    00181       double es4;                             /* es2 * es2      */
    00182       double es6;                             /* es4 * es2  */
    00183       double Ra_Over_Sqrt_Two_Plus_PI;        /* Ra(6371007.1810824)/Sqrt(2.0 + PI) */
    00184       double Inv_Ra_Over_Sqrt_Two_Plus_PI;    /* Sqrt(2.0 + PI)/Ra(6371007.1810824) */
    00185
    00186       /* Eckert6 projection Parameters */
    00187       double Eck6_Origin_Long;                /* Longitude of origin in radians    */
    00188       double Eck6_False_Easting;
    00189       double Eck6_False_Northing;
    00190       double Eck6_Delta_Northing;
    00191       double Eck6_Max_Easting;
    00192       double Eck6_Min_Easting;
    00193
    00194     };
    00195   }
    00196 }
    00197
    00198 #endif
    00199
    00200
    00201 // CLASSIFICATION: UNCLASSIFIED