2 # define PI 3.1415926535897932384626433832795029L
6 * Note that all floating point calculations are rounded with .5 going up.
7 * Since C automatically truncates, adding .5 to every calculation does
8 * rounding for us nicely.
10 * To indicate unavailable data
11 * 999 is used for temperature
12 * x<0 is used for rh, pressure, and windspeed
16 int rh_C(int temp_C
, int dewpt_C
);
17 int rh_F(int temp_F
, int dewpt_F
);
18 int heatindex_C(int temp_C
, int rh
);
19 int heatindex_F(int temp_F
, int rh
);
20 int windchill_C(int temp_C
, int windspeed
); /* knots */
21 int windchill_F(int temp_F
, int windspeed
); /* knots */
23 /* Length Conversions */
25 float m2mi(int meters
);
27 /* Windspeed Conversions */
28 int knots2mph(int knots
);
29 int knots2kph(int knots
);
30 int knots2mps(int knots
);
31 int knots2beaufort(int knots
);
32 int kph2knots(int kph
);
33 int mps2knots(int mps
);
35 /* Temperature Conversions */
36 int temp_C2F(int temp_C
);
37 int temp_F2C(int temp_F
);
39 /* Pressure Conversions */
40 float inHg2mmHg(float inHg
);
41 float inHg2hPa(float inHg
);
42 float inHg2atm(float inHg
);
43 float hPa2inHg(float hPa
);
45 /* Time Conversions */
46 time_t mkgmtime(struct tm
*tm
);
47 int utc2local(int hm
, int *mon
, int *day
, int *year
, int *wday
);
48 int local2utc(int hm
, int *mon
, int *day
, int *year
, int *wday
);
49 void fix_date(int *month
, int *day
, int *year
, int *wday
);
52 /* Letter Case (destructive!) */
53 char *str_upper(char *str
);
54 char *str_lower(char *str
);
56 /* Angle conversions */
57 double rad2deg(double angle
);
58 double deg2rad(double angle
);
60 /* Date conversions */
61 int mdy2doy(int mn
, int dy
, int y
);
62 double mdy2jd(int year
, int month
, int day
);
63 double jd2jcent(double jd
);
64 double jcent2jd(double t
);
66 /* Lat/Long conversions */
67 int str2dd(char *s
, double *lat
, double *lon
);