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
Example #2
0
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
Example #3
0
    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
Example #4
0
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
Example #5
0
 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)
Example #6
0
 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)