def estimate_fao56_daily(self, day_of_year, temp_c, temp_c_min, temp_c_max, tdew, elevation, latitude, rh, wind_m_s, atmos_pres): """ Estimate fao56 from weather """ sha = pyeto.sunset_hour_angle(pyeto.deg2rad(latitude), pyeto.sol_dec(day_of_year)) daylight_hours = pyeto.daylight_hours(sha) sunshine_hours = 0.8 * daylight_hours ird = pyeto.inv_rel_dist_earth_sun(day_of_year) et_rad = pyeto.et_rad(pyeto.deg2rad(latitude), pyeto.sol_dec(day_of_year), sha, ird) sol_rad = pyeto.sol_rad_from_sun_hours(daylight_hours, sunshine_hours, et_rad) net_in_sol_rad = pyeto.net_in_sol_rad(sol_rad=sol_rad, albedo=0.23) cs_rad = pyeto.cs_rad(elevation, et_rad) avp = pyeto.avp_from_tdew(tdew) net_out_lw_rad = pyeto.net_out_lw_rad( pyeto.convert.celsius2kelvin(temp_c_min), pyeto.convert.celsius2kelvin(temp_c_max), sol_rad, cs_rad, avp) net_rad = pyeto.net_rad(net_in_sol_rad, net_out_lw_rad) eto = pyeto.fao56_penman_monteith( net_rad=net_rad, t=pyeto.convert.celsius2kelvin(temp_c), ws=wind_m_s, svp=pyeto.svp_from_t(temp_c), avp=avp, delta_svp=pyeto.delta_svp(temp_c), psy=pyeto.psy_const(atmos_pres)) return eto
def get_data_from_WU(): ###array to store the reports wu_weather_reports = [] ## today and last 6 days definition day1 = now - datetime.timedelta(days=6) day2 = now - datetime.timedelta(days=5) day3 = now - datetime.timedelta(days=4) day4 = now - datetime.timedelta(days=3) day5 = now - datetime.timedelta(days=2) day6 = now - datetime.timedelta(days=1) day7 = now #### convert dates to WU required format days = { 'day1': day1.strftime('%Y%m%d'), 'day2': day2.strftime('%Y%m%d'), 'day3': day3.strftime('%Y%m%d'), 'day4': day4.strftime('%Y%m%d'), 'day5': day5.strftime('%Y%m%d'), 'day6': day6.strftime('%Y%m%d'), 'day7': day7.strftime('%Y%m%d') } ### make API wather hisotry call for each day for day in days: url = 'http://api.wunderground.com/api/7c2ab99a0ccee978/history_{0}/q/95316.json'.format( days[day]) headers = {'content-type': 'application/JSON; charset=utf8'} response = requests.get(url, headers=headers) data = json.loads(response.text) #ETo calculation for the day using FAO-56 Penman-Monteith method lat = pyeto.deg2rad(37.585652) altitude = 38 julian_day = datetime.datetime.strptime(days.get(day), '%Y%m%d').timetuple().tm_yday sol_dec = pyeto.sol_dec(julian_day) sha = pyeto.sunset_hour_angle(lat, sol_dec) ird = pyeto.inv_rel_dist_earth_sun(julian_day) ### net radiation calculator net_rad = pyeto.et_rad(lat, sol_dec, sha, ird) temp_c = float(data["history"]["observations"][1]["tempm"]) temp_k = float(data["history"]["observations"][1]["tempi"]) humidity = float(data["history"]["observations"][1]["hum"]) dew_point = float(data["history"]["observations"][1]["dewptm"]) ws = float(data["history"]["observations"][1]["wspdm"]) #actual and saturated vapour pressure in kPH svp = pyeto.svp_from_t(temp_c) avp = pyeto.avp_from_tdew(dew_point) delta_svp = pyeto.delta_svp(temp_c) atm_pressure = pyeto.atm_pressure(altitude) psy = pyeto.psy_const(atm_pressure) #### the ETo plugin retun results in mm, it was converted to inched ETo_in_mm = pyeto.fao56_penman_monteith(net_rad, temp_k, ws, svp, avp, delta_svp, psy, shf=0.0) ETo = ETo_in_mm * 0.039370 ## insert eto value to day weather report data["history"]["observations"][1].update( {"ETo": "{0:.2f}".format(ETo)}) ###add report to report collector array wu_weather_reports.append(data["history"]["observations"][1]) #return all reports return wu_weather_reports
def calculate_precipitation(self, d): if "rain" in d: self.rain_day = float(d["rain"]) if "snow" in d: self.snow_day = float(d["snow"]) # def calculate_ev_fao56_factor(self, d): dt = d['dt'] factor = 0.0 if dt > d['sunrise']: if dt < d['sunset']: factor = min(float(dt - d['sunrise'])/3600.0, 1.0) else: if dt > d['sunset']: factor = (dt - d['sunrise'])/3600.0 if factor < 1.0: factor = 1.0 - factor return factor #def estimate_fao56_hourly(self, day_of_year, temp_c, tdew, elevation, latitude, rh, wind_m_s, atmos_pres): """ Estimate fao56 from weather """ sha = pyeto.sunset_hour_angle(pyeto.deg2rad(latitude), pyeto.sol_dec(day_of_year)) daylight_hours = pyeto.daylight_hours(sha) sunshine_hours = 0.8 * daylight_hours ird = pyeto.inv_rel_dist_earth_sun(day_of_year) et_rad = pyeto.et_rad(pyeto.deg2rad(latitude), pyeto.sol_dec(day_of_year), sha, ird) sol_rad = pyeto.sol_rad_from_sun_hours(daylight_hours, sunshine_hours, et_rad) net_in_sol_rad = pyeto.net_in_sol_rad(sol_rad=sol_rad, albedo=0.23) cs_rad = pyeto.cs_rad(elevation, et_rad) avp = pyeto.avp_from_tdew(tdew) #not sure if I trust this net_out_lw_rad calculation here! net_out_lw_rad = pyeto.net_out_lw_rad(temp_c-1, temp_c, sol_rad, cs_rad, avp) net_rad = pyeto.net_rad(net_in_sol_rad, net_out_lw_rad) eto = pyeto.fao56_penman_monteith( net_rad=net_rad, t=pyeto.convert.celsius2kelvin(temp_c), ws=wind_m_s, svp=pyeto.svp_from_t(temp_c), avp=avp, delta_svp=pyeto.delta_svp(temp_c), psy=pyeto.psy_const(atmos_pres)) return eto #def calculate_fao56_hourly(self, d): day_of_year = datetime.datetime.now().timetuple().tm_yday T_hr = d['temp'] t_dew = float(d["dew_point"]) pressure = d['pressure'] RH_hr = d['humidity'] u_2 = d['wind_speed'] #print("CALCULATE_FAO56:") #print("T_hr: {}".format(T_hr)) #print("t_dew: {}".format(t_dew)) #print("RH_hr: {}".format(RH_hr)) #print("u_2: {}".format(u_2)) #print("pressure: {}".format(pressure)) fao56 = self.estimate_fao56_hourly(day_of_year, T_hr, t_dew, self.elevation, LAT, RH_hr, u_2, pressure) return fao56
def get_data_from_WU(): ###array to store the reports wu_weather_reports = [] ## today and last 6 days definition day1 = now - datetime.timedelta(days=6) day2 = now - datetime.timedelta(days=5) day3 = now - datetime.timedelta(days=4) day4 = now - datetime.timedelta(days=3) day5 = now - datetime.timedelta(days=2) day6 = now - datetime.timedelta(days=1) day7 = now #### convert dates to WU required format days = { 'day1': day1.strftime('%Y%m%d'), 'day2': day2.strftime('%Y%m%d'), 'day3': day3.strftime('%Y%m%d'), 'day4': day4.strftime('%Y%m%d'), 'day5': day5.strftime('%Y%m%d'), 'day6': day6.strftime('%Y%m%d'), 'day7': day7.strftime('%Y%m%d') } ### make API wather hisotry call for each day for day in days: url = 'http://api.wunderground.com/api/7c2ab99a0ccee978/history_{0}/q/95316.json'.format(days[day]) headers = {'content-type': 'application/JSON; charset=utf8'} response = requests.get(url, headers=headers) data = json.loads(response.text) #ETo calculation for the day using FAO-56 Penman-Monteith method lat = pyeto.deg2rad(37.585652) altitude = 38 julian_day = datetime.datetime.strptime(days.get(day), '%Y%m%d').timetuple().tm_yday sol_dec = pyeto.sol_dec(julian_day) sha = pyeto.sunset_hour_angle(lat, sol_dec) ird = pyeto.inv_rel_dist_earth_sun(julian_day) ### net radiation calculator net_rad = pyeto.et_rad(lat, sol_dec, sha, ird) temp_c = float(data["history"]["observations"][1]["tempm"]) temp_k = float(data["history"]["observations"][1]["tempi"]) humidity = float(data["history"]["observations"][1]["hum"]) dew_point = float(data["history"]["observations"][1]["dewptm"]) ws = float(data["history"]["observations"][1]["wspdm"]) #actual and saturated vapour pressure in kPH svp = pyeto.svp_from_t(temp_c) avp = pyeto.avp_from_tdew(dew_point) delta_svp = pyeto.delta_svp(temp_c) atm_pressure = pyeto.atm_pressure(altitude) psy = pyeto.psy_const(atm_pressure) #### the ETo plugin retun results in mm, it was converted to inched ETo_in_mm = pyeto.fao56_penman_monteith(net_rad, temp_k, ws, svp, avp, delta_svp, psy, shf=0.0) ETo = ETo_in_mm * 0.039370 ## insert eto value to day weather report data["history"]["observations"][1].update({"ETo": "{0:.2f}".format(ETo)}) ###add report to report collector array wu_weather_reports.append(data["history"]["observations"][1]) #return all reports return wu_weather_reports
def test_avp_from_tdew(self): # Test based on example 20, p.121 of FAO paper avp = pyeto.avp_from_tdew(14.8) self.assertAlmostEqual(avp, 1.68, 2)