gnomonic.h
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上传用户:oybseng
上传日期:2015-04-27
资源大小:7831k
文件大小:8k
源码类别:
GDI/图象编程
开发平台:
Visual C++
- #ifndef GNOM_H
- #define GNOM_H
- /***************************************************************************/
- /* RSC IDENTIFIER: GNOMONIC
- *
- * ABSTRACT
- *
- * This component provides conversions between Geodetic coordinates
- * (latitude and longitude in radians) and Gnomonic
- * projection coordinates (easting and northing in meters). This projection
- * employs a spherical Earth model. The spherical radius used is the radius
- * of the sphere having the same area as the ellipsoid.
- *
- * ERROR HANDLING
- *
- * This component checks parameters for valid values. If an invalid value
- * is found the error code is combined with the current error code using
- * the bitwise or. This combining allows multiple error codes to be
- * returned. The possible error codes are:
- *
- * GNOM_NO_ERROR : No errors occurred in function
- * GNOM_LAT_ERROR : Latitude outside of valid range
- * (-90 to 90 degrees)
- * GNOM_LON_ERROR : Longitude outside of valid range
- * (-180 to 360 degrees)
- * GNOM_EASTING_ERROR : Easting outside of valid range
- * (depends on ellipsoid and projection
- * parameters)
- * GNOM_NORTHING_ERROR : Northing outside of valid range
- * (depends on ellipsoid and projection
- * parameters)
- * GNOM_ORIGIN_LAT_ERROR : Origin latitude outside of valid range
- * (-90 to 90 degrees)
- * GNOM_CENT_MER_ERROR : Central meridian outside of valid range
- * (-180 to 360 degrees)
- * GNOM_A_ERROR : Semi-major axis less than or equal to zero
- * GNOM_INV_F_ERROR : Inverse flattening outside of valid range
- * (250 to 350)
- *
- *
- * REUSE NOTES
- *
- * GNOMONIC is intended for reuse by any application that
- * performs a Gnomonic projection or its inverse.
- *
- * REFERENCES
- *
- * Further information on GNOMONIC can be found in the Reuse Manual.
- *
- * GNOMONIC originated from: U.S. Army Topographic Engineering Center
- * Geospatial Information Division
- * 7701 Telegraph Road
- * Alexandria, VA 22310-3864
- *
- * LICENSES
- *
- * None apply to this component.
- *
- * RESTRICTIONS
- *
- * GNOMONIC has no restrictions.
- *
- * ENVIRONMENT
- *
- * GNOMONIC was tested and certified in the following environments:
- *
- * 1. Solaris 2.5 with GCC, version 2.8.1
- * 2. MSDOS with MS Visual C++, version 6
- *
- * MODIFICATIONS
- *
- * Date Description
- * ---- -----------
- * 05-22-00 Original Code
- *
- *
- */
- /***************************************************************************/
- /*
- * DEFINES
- */
- #define GNOM_NO_ERROR 0x0000
- #define GNOM_LAT_ERROR 0x0001
- #define GNOM_LON_ERROR 0x0002
- #define GNOM_EASTING_ERROR 0x0004
- #define GNOM_NORTHING_ERROR 0x0008
- #define GNOM_ORIGIN_LAT_ERROR 0x0010
- #define GNOM_CENT_MER_ERROR 0x0020
- #define GNOM_A_ERROR 0x0040
- #define GNOM_INV_F_ERROR 0x0080
- /***************************************************************************/
- /*
- * FUNCTION PROTOTYPES
- * for GNOM.C
- */
- /* ensure proper linkage to c++ programs */
- #ifdef __cplusplus
- extern "C" {
- #endif
- long Set_Gnomonic_Parameters(double a,
- double f,
- double Origin_Latitude,
- double Central_Meridian,
- double False_Easting,
- double False_Northing);
- /*
- * 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)
- */
- void Get_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)
- */
- long Convert_Geodetic_To_Gnomonic (double Latitude,
- double Longitude,
- double *Easting,
- double *Northing);
- /*
- * 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_Gnomonic_To_Geodetic(double Easting,
- double Northing,
- double *Latitude,
- double *Longitude);
- /*
- * 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)
- */
- #ifdef __cplusplus
- }
- #endif
- #endif /* GNOM_H */