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Mixer Data - ET0calc, ET0final

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    RainMachine Nicholas

    Hi,

    For mixer data:

    et0       - Is the ET received from the weather service (if exists). Currently only CIMIS, FAWN send this data and certain local weather stations using the PWS weather parser.

    et0calc - Is the ET computed using our formula (a variation of Penman-Monteith) based on weather data

    et0final - Is the average between et0 and et0calc. If et0final is different from et0calc it means that some et0 value was returned from a weather parser/service.

     

    Can you tell me what parsers are running on your device ?

     

     

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    Glenn G.

    Hi Nicholas,

    Now that's both interesting and enlightening.

    I'm using the Wunderground parser (station=KTXFAIRV5, a PWS on the Wunderground network).  Notice that "mixerDataByDate.et0" = null (not surprising since it's a PWS).

    Since et0final is average of et0calc and et0, then in this case et0final will be 50% of et0calc; which it is as shown in the mixer data --- that's significant .  Perhaps if weather station et0 = 0 or null, then should not calculate et0final as average.  This is also then causing ET on the "Weather Services - Comparison" chart to misrepresent ET; which I believe is showing et0final for past date references. 

    Can you also confirm that "pastValues.et0" from the "/watering/past/<date>" API is representing the ET0 used at the time the irrigation program was run for that particular day?

    Appreciate your comments and insights on these Community posts!

     

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    Glenn G.

    Add'l ...

    Also have NOAA parser enabled.

    Please also note regarding the "Weather Services - Comparison" chart for ET ... Since et0final was so much lower than et0calc, it was leading me to believe that the RM was actually over-watering.

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    RainMachine Nicholas

    Yes the pastValues.et0 and qpf are the values used at the program start. 

    The mixer will not average NULL values, if it receives a NULL et0 it won't take it in consideration, the ET0Final might decrease if the actual observed data is different from the forecasted. 

    I will check with development team if the next beta update has any changes for Weather Underground, as your et0final looks exactly half of the et0calc which means that something is wrong. Either some bad data from station that results in a et0 being computed 0 or something in the handling of data from WUnderground.

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    Glenn G.

    Nicholas,

    Thanks for the follow-up.  If it helps, here is the WUnderground parser data for that particular day.

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