Check line 370, file wxservices.py <https://github.com/weewx/weewx/blob/master/bin/weewx/wxservices.py#L370>
-tk On Thu, May 3, 2018 at 9:59 AM, John Hill <[email protected]> wrote: > Hi Thomas, > Sorry to rehash an old thread, but I was looking though your wxformulas.py > for more info on the ET calc. As you mentioned, ET used to be calculated > as a rate but now is just a measured quantity, like rain. However, the > calcs and the examples in wxformulas.py still reference a rate. > > For example, line 687: > Returns: Evapotranspiration in mm/hr > Example (Example 19 in the reference document): > >>> sr_mean_wpm2 = 680.56 # == 2.45 MJ/m^2/hr > >>> timestamp = 1475337600 # 1-Oct-2016 at 16:00UTC > >>> print "ET0 = %.2f mm/hr" % evapotranspiration_Metric(Tmin_C=38, > Tmax_C=38, rh_min=52, rh_max=52, > ... sr_mean_wpm2=sr_mean_wpm2, ws_mps=3.3, wind_height_m=2, > ... latitude_deg=16.217, longitude_deg=-16.25, altitude_m=8, > timestamp=timestamp) > ET0 = 0.63 mm/hr > Another example, this time for night > >>> sr_mean_wpm2 = 0.0 # night time > >>> timestamp = 1475294400 # 1-Oct-2016 at 04:00UTC (0300 local) > >>> print "ET0 = %.2f mm/hr" % evapotranspiration_Metric(Tmin_C=28, > Tmax_C=28, rh_min=90, rh_max=90, > ... sr_mean_wpm2=sr_mean_wpm2, ws_mps=3.3, wind_height_m=2, > ... latitude_deg=16.217, longitude_deg=-16.25, altitude_m=8, > timestamp=timestamp) > ET0 = 0.03 mm/hr > > -- > You received this message because you are subscribed to the Google Groups > "weewx-user" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > For more options, visit https://groups.google.com/d/optout. > -- You received this message because you are subscribed to the Google Groups "weewx-user" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/d/optout.
