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/* RCSid $Id: loadEPW.h,v 2.1 2025/02/26 20:39:28 greg Exp $ */
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/*
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* Header for EPW (or WEA) file loader
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*
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* G. Ward, Feb 2025
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*/
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#ifndef _RAD_LOADEPW_H_
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#define _RAD_LOADEPW_H_
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#ifdef __cplusplus
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extern "C" {
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#endif
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enum {Sunday, Monday, Tuesday, Wednesday,
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Thursday, Friday, Saturday};
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extern const char WDname[7][10];
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enum {January, February, March, April, May, June, July,
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August, September, October, November, December};
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extern const char MOname[12][10];
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enum {WEAnot=0, WEAradnorm=1, WEAradhoriz=2, WEAphotnorm=3};
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/* EPW date and time */
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typedef struct {
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float hour; /* decimal hour (0-24) */
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short day; /* day of the month (1-31) */
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short month; /* month of the year (0-11) */
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short year; /* year (or 0) */
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} EPWdate;
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/* EPW file header info. */
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typedef struct {
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FILE *fp; /* open file pointer */
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int lino; /* current line in file */
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int dstart; /* starting data position in file */
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short lin0; /* # lines in header */
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short isWEA; /* input is WEA data type? */
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EPWdate dtpos; /* date and time of current record */
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struct Location {
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char city[64]; /* location city */
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char state[64]; /* location state/province */
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char country[64]; /* country */
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char source[64]; /* data source */
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char wmo[16]; /* WMO (EnergyPlus alpha?) */
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double latitude; /* site latitude (deg north) */
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double longitude; /* site longitude (deg east) */
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float timezone; /* time zone (hours from GMT) */
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float elevation; /* site altitude in meters */
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} loc; /* location data */
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/* struct DesConditions XXX unsupported */
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/* struct VarPeriods XXX unsupported */
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/* struct GroundTemps XXX unsupported */
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/* struct SpecialDays XXX unsupported */
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char *comments1; /* first set of additional comments */
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char *comments2; /* second set of comments */
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int nperiods; /* # of data periods */
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struct DataPeriod {
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char name[64]; /* data period name */
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short nperhour; /* # records/hour */
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short startday; /* starting day of the week */
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EPWdate firstdate; /* starting date */
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EPWdate lastdate; /* ending date */
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} period[1]; /* periods covered in EPW file */
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} EPWheader;
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/* EPW record holder (NOTE: all lengths in meters, contrary to spec!) */
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typedef struct {
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EPWdate date; /* measurement date and time */
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char uncert[64]; /* uncertainty flags */
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float dbtemp; /* dry bulb temperature (deg-C) */
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float dptemp; /* dew point temperature (deg-C) */
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float humidity; /* relative humidity (0-110 %) */
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float atmospressure; /* atmospheric pressure (31000 - 120000) */
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float exthorizirrad; /* extraterrestrial horizontal irradiance */
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float extdirirrad; /* extraterrestrial direct normal irradiance */
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float horizirrad_ir; /* infrared horizontal normal irradiance */
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float globhorizirrad; /* global horizontal irradiance */
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float dirirrad; /* direct normal irradiance */
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float horizdiffirrad; /* horizontal diffuse irradiance */
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float globhorizillum; /* global horizontal illuminance (lux) */
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float diffillum; /* diffuse horizontal illuminance (lux) */
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float dirillum; /* direct normal illuminance (lux) */
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float zenlum; /* zenith luminance (cd/m2) */
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float windirection; /* wind direction (deg E of N) */
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float windspeed; /* wind speed in m/s */
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float skycover; /* total sky coverage (fraction) */
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float opskycover; /* opaque sky coverage (fraction) */
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float visibility; /* visibility (meters!) */
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float ceilheight; /* cloud ceiling height (meters) */
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/* char weather[32]; XXX unsupported */
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float precip; /* precipital water in meters(!) */
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float optdepth; /* aerosol optical depth (fraction!) */
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float snowdepth; /* snow depth (meters!) */
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int nosnowdays; /* # days since last snow */
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float albedo; /* ratio of reflected to global horiz. irrad */
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float liqpdepth; /* liquid precipitation depth (meters!) */
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float liqhours; /* liquid precipitation quantity (hours) */
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} EPWrecord;
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extern const EPWrecord EPWrecInit;
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#define EPWisset(rp,field) ((rp)->field != EPWrecInit.field)
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/* specify NULL for stdin */
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extern EPWheader * EPWopen(const char *fname);
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extern int EPWseek(EPWheader *epw, const EPWdate *dt);
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extern int EPWread(EPWheader *epw, EPWrecord *rp);
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extern void EPWclose(EPWheader *epw);
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#ifdef __cplusplus
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}
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#endif
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#endif /* ! _RAD_LOADEPW_H_ */
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