geographic.h

Go to the documentation of this file.

/*  geographic.h
*  contains the geographic database constants, structure definitions,
    and prototypes.   Wayne Martin - CNRFC  09/24/91  */
 
#ifndef _geographich
#define _geographich
 
/* Constants */
#define  NO_ORD       2147483647L
#define  MAX_LAT_DEG       90L
#define  MAX_LON_DEG      180L
#define  MAX_MINUTE        60L
#define  MAX_SECOND        60L
#define  MIN              060.000
#define  SEC             3600.00
#define  MAGIC_NUM       5000.00
 
/* In the HYDROMET database, the geographic location of a sensor is
    stored by latitude and longitude ordinates. Each ordinate pair represents
    a unique number that has degrees, minutes, and seconds folded into it. */
struct ordinates  {
    signed long int  lat_ord;
    signed long int  long_ord;
};
 
/* Structure which contains the component parts of latitude and longitude. */
struct location_unit  {
    unsigned long int  degree;
    unsigned long int  minute;
    unsigned long int  second;
    unsigned char      hemisphere;
};
 
/* Location defined by latitude and longitude. */
struct location  {
    struct location_unit latitude;
    struct location_unit longitude;
};
 
/* function prototypes */
struct ordinates code_ords(struct location loc);
struct location decode_ords(struct ordinates ord);
signed long int get_location(struct location *loc);
void dist_dir(struct location *start_loc, struct location *dest_loc,
                        float *distance, float *angle, char *compass);
 
#endif /* _geographich */