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direwolf/geotranz/polarst.h
WB2OSZ 8b81a3226f Version 1.2 
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#ifndef POLARST_H
#define POLARST_H
/***************************************************************************/
/* RSC IDENTIFIER: POLAR STEREOGRAPHIC
*
*
* ABSTRACT
*
* This component provides conversions between geodetic (latitude and
* longitude) coordinates and Polar Stereographic (easting and northing)
* coordinates.
*
* 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:
*
* POLAR_NO_ERROR : No errors occurred in function
* POLAR_LAT_ERROR : Latitude outside of valid range
* (-90 to 90 degrees)
* POLAR_LON_ERROR : Longitude outside of valid range
* (-180 to 360 degrees)
* POLAR_ORIGIN_LAT_ERROR : Latitude of true scale outside of valid
* range (-90 to 90 degrees)
* POLAR_ORIGIN_LON_ERROR : Longitude down from pole outside of valid
* range (-180 to 360 degrees)
* POLAR_EASTING_ERROR : Easting outside of valid range,
* depending on ellipsoid and
* projection parameters
* POLAR_NORTHING_ERROR : Northing outside of valid range,
* depending on ellipsoid and
* projection parameters
* POLAR_RADIUS_ERROR : Coordinates too far from pole,
* depending on ellipsoid and
* projection parameters
* POLAR_A_ERROR : Semi-major axis less than or equal to zero
* POLAR_INV_F_ERROR : Inverse flattening outside of valid range
* (250 to 350)
*
*
* REUSE NOTES
*
* POLAR STEREOGRAPHIC is intended for reuse by any application that
* performs a Polar Stereographic projection.
*
*
* REFERENCES
*
* Further information on POLAR STEREOGRAPHIC can be found in the
* Reuse Manual.
*
*
* POLAR STEREOGRAPHIC 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
*
* POLAR STEREOGRAPHIC has no restrictions.
*
*
* ENVIRONMENT
*
* POLAR STEREOGRAPHIC was tested and certified in the following
* environments:
*
* 1. Solaris 2.5 with GCC, version 2.8.1
* 2. Window 95 with MS Visual C++, version 6
*
*
* MODIFICATIONS
*
* Date Description
* ---- -----------
* 06-11-95 Original Code
* 03-01-97 Original Code
*
*
*/
/**********************************************************************/
/*
* DEFINES
*/
#define POLAR_NO_ERROR 0x0000
#define POLAR_LAT_ERROR 0x0001
#define POLAR_LON_ERROR 0x0002
#define POLAR_ORIGIN_LAT_ERROR 0x0004
#define POLAR_ORIGIN_LON_ERROR 0x0008
#define POLAR_EASTING_ERROR 0x0010
#define POLAR_NORTHING_ERROR 0x0020
#define POLAR_A_ERROR 0x0040
#define POLAR_INV_F_ERROR 0x0080
#define POLAR_RADIUS_ERROR 0x0100
/**********************************************************************/
/*
* FUNCTION PROTOTYPES
*/
/* ensure proper linkage to c++ programs */
#ifdef __cplusplus
extern "C" {
#endif
long Set_Polar_Stereographic_Parameters (double a,
double f,
double Latitude_of_True_Scale,
double Longitude_Down_from_Pole,
double False_Easting,
double False_Northing);
/*
* The function Set_Polar_Stereographic_Parameters receives the ellipsoid
* parameters and Polar Stereograpic projection parameters as inputs, and
* sets the corresponding state variables. If any errors occur, error
* code(s) are returned by the function, otherwise POLAR_NO_ERROR is returned.
*
* a : Semi-major axis of ellipsoid, in meters (input)
* f : Flattening of ellipsoid (input)
* Latitude_of_True_Scale : Latitude of true scale, in radians (input)
* Longitude_Down_from_Pole : Longitude down from pole, in radians (input)
* False_Easting : Easting (X) at center of projection, in meters (input)
* False_Northing : Northing (Y) at center of projection, in meters (input)
*/
void Get_Polar_Stereographic_Parameters (double *a,
double *f,
double *Latitude_of_True_Scale,
double *Longitude_Down_from_Pole,
double *False_Easting,
double *False_Northing);
/*
* The function Get_Polar_Stereographic_Parameters returns the current
* ellipsoid parameters and Polar projection parameters.
*
* a : Semi-major axis of ellipsoid, in meters (output)
* f : Flattening of ellipsoid (output)
* Latitude_of_True_Scale : Latitude of true scale, in radians (output)
* Longitude_Down_from_Pole : Longitude down from pole, in radians (output)
* False_Easting : Easting (X) at center of projection, in meters (output)
* False_Northing : Northing (Y) at center of projection, in meters (output)
*/
long Convert_Geodetic_To_Polar_Stereographic (double Latitude,
double Longitude,
double *Easting,
double *Northing);
/*
* The function Convert_Geodetic_To_Polar_Stereographic converts geodetic
* coordinates (latitude and longitude) to Polar Stereographic coordinates
* (easting and northing), according to the current ellipsoid
* and Polar Stereographic projection parameters. If any errors occur, error
* code(s) are returned by the function, otherwise POLAR_NO_ERROR is returned.
*
* Latitude : Latitude, in radians (input)
* Longitude : Longitude, in radians (input)
* Easting : Easting (X), in meters (output)
* Northing : Northing (Y), in meters (output)
*/
long Convert_Polar_Stereographic_To_Geodetic (double Easting,
double Northing,
double *Latitude,
double *Longitude);
/*
* The function Convert_Polar_Stereographic_To_Geodetic converts Polar
* Stereographic coordinates (easting and northing) to geodetic
* coordinates (latitude and longitude) according to the current ellipsoid
* and Polar Stereographic projection Parameters. If any errors occur, the
* code(s) are returned by the function, otherwise POLAR_NO_ERROR
* is returned.
*
* Easting : Easting (X), in meters (input)
* Northing : Northing (Y), in meters (input)
* Latitude : Latitude, in radians (output)
* Longitude : Longitude, in radians (output)
*
*/
#ifdef __cplusplus
}
#endif
#endif /* POLARST_H */
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