/usr/include/gctp/isin.h is in libgctp-dev 1.0-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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NAME ISIN.H
PURPOSE: Integerized Sinusoidal Library Header - constants, data
structures and prototypes for integerized sinusoidal library
functions.
PROGRAMMER DATE REASON
---------- ---- ------
Robert Wolfe (STX) 1-2-97 Initial version.
Raj Gejjagaraguppe (ARC) 1-15-97 Modified the code to work with
GCTP software.
D*****************************************************************************/
#ifdef __cplusplus
extern "C" {
#endif
/* Status returned */
#define ISIN_SUCCESS 0 /* Successful return */
#define ISIN_ERROR -1 /* Error return */
#define ISIN_ERANGE -2 /* Input variable out of range */
/* Data Structures */
/* Row Type; Information for Eash Row (longitudinal band) in Projection */
typedef struct {
long ncol; /* Number of columns */
long icol_cen; /* Column number to left of center of grid */
double ncol_inv; /* Number of columns inverse */
} Isin_row_t;
/* Handle Type; Values assigned in 'Isin_init' */
typedef struct {
double false_east; /* Northing at projection origin */
double false_north; /* Easting at projection origin */
double sphere; /* Sphere radius (user's units) */
double sphere_inv; /* Sphere radius inverse (user's units) */
double ang_size_inv; /* Grid angular resolution inverse (1/rad)*/
long nrow; /* Number of rows (longitudinal zones) */
long nrow_half; /* Half of number of rows (longitudinal zones)*/
double ref_lon; /* Zero reference longitude (rad) */
double lon_cen_mer; /* Longitude of central meridian (rad) */
int ijustify; /* Justify flag (see Isin_init) */
double col_dist; /* Distance for one column in projection
* (user's units) */
double col_dist_inv; /* Distance for one column in projection inverse
* (user's units) */
Isin_row_t *row; /* Row data structure */
long key; /* Data structure key */
} Isin_t;
/* Error Structure */
typedef struct {
int num; /* Error number */
char *str; /* Error message */
} error_t;
/* Prototypes */
/* Initialize integerized sinusoidal forward transformations */
int isinusforinit(double , double, double, double, double, double);
Isin_t *Isin_for_init(double , double, double, double, long, int);
/* Initialize integerized sinusoidal inverse transformations */
int isinusinvinit(double , double, double, double, double, double);
Isin_t *Isin_inv_init(double , double, double, double, long, int);
/* Forward mapping; converts geographic coordinates ('lon', 'lat')
* to map projection coordinates ('x', 'y') */
int isinusfor(double, double, double *, double *);
int Isin_fwd(const Isin_t *, double, double, double *, double *);
/* Inverse mapping; converts map projection coordinates ('x', 'y') to
* geographic coordinates ('lon', 'lat') */
int isinusinv(double, double, double *, double *);
int Isin_inv(const Isin_t *, double, double, double *, double *);
/* Deallocate the 'isin' data structure and array memory */
int Isin_for_free(Isin_t *);
int Isin_inv_free(Isin_t *);
/* Private function to handle errors */
static int Isin_error(const error_t *, const char *);
#ifdef __cplusplus
}
#endif
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