[weewx-user] Re: Seasons' Current Conditions Baro (Parenthetical) - Meaning?

2019-04-30 Thread V. Kelly Bellis 
Got it!
https://github.com/weewx/weewx/blob/master/bin/weewx/uwxutils.py

Thanks for your help Andrew!

On Tuesday, April 30, 2019 at 10:17:31 AM UTC-4, V. Kelly Bellis wrote:
>
> Maybe here?
> https://github.com/weewx/weewx/blob/master/bin/weewx/wxformulas.py
>

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[weewx-user] Re: Seasons' Current Conditions Baro (Parenthetical) - Meaning?

2019-04-30 Thread V. Kelly Bellis 
Maybe here?
https://github.com/weewx/weewx/blob/master/bin/weewx/wxformulas.py

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[weewx-user] Re: Seasons' Current Conditions Baro (Parenthetical) - Meaning?

2019-04-30 Thread V. Kelly Bellis 
Thank you for the reply Andrew. Followup questions below

On Tuesday, April 30, 2019 at 9:35:13 AM UTC-4, Andrew Milner wrote:
>
> 1. It is the change in pressure over, I think, the last 3 hours.  Check 
> the template and see what delta is actually being used to populate the 
> field if you want a definitive answer
>

Is this where and what you were referring to?
/etc/weewx/skins/Seasons/statistics.inc
...

  $obs.label.barometer
  $unit.label.barometer
  #for $archive in $archive_data
  $archive.barometer.max.format(add_label=False)
$archive.barometer.maxtime
$archive.barometer.min.format(add_label=False)
$archive.barometer.mintime
  
  #end for


I'm guessing this is probably the wrong answer.
 

>
> 3.  You say you have an Ambient station rather than Fine Offset - so what 
> applies to one may not apply to the other.  Only read things pertaining to 
> your specific station.  The formula used for barometer and altimeter 
> derivations are well documented - either search the forum for this specific 
> answer or check the comments in the code.
>

Ambient is rebranded FineOffset hardware.

Might you know in which file and where exactly that code is contained?
 

> 4.  All weewx calculations are done using floating point with REAL types 
> and no restriction on number of places.  If you use MySQL instead of 
> sqlite3 it is possible to specify in the database fields the number of 
> digits to the right - but as far as I know this is not possible in sqlite3.
>

I embarrassed to admit, I know next to nothing about SQL no matter what 
database engine is in play; however, I trying to learn on my own. Next year 
when I turn 65, I plan to enroll in University of Maine classes as that's 
when tuition fees are waived.

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[weewx-user] Re: Seasons' Current Conditions Baro (Parenthetical) - Meaning?

2019-04-30 Thread Andrew Milner 
1. It is the change in pressure over, I think, the last 3 hours.  Check the 
template and see what delta is actually being used to populate the field if 
you want a definitive answer

2. Not necessarily, it may vary slightly due to the floating point 
libraries doing the conversions from inHg to HPa being applied to real 
numeric types.  Also it depends how often the console updates it's 
displayed value!

3.  You say you have an Ambient station rather than Fine Offset - so what 
applies to one may not apply to the other.  Only read things pertaining to 
your specific station.  The formula used for barometer and altimeter 
derivations are well documented - either search the forum for this specific 
answer or check the comments in the code.

4.  All weewx calculations are done using floating point with REAL types 
and no restriction on number of places.  If you use MySQL instead of 
sqlite3 it is possible to specify in the database fields the number of 
digits to the right - but as far as I know this is not possible in sqlite3.



On Tuesday, 30 April 2019 16:02:18 UTC+3, V. Kelly Bellis wrote:
>
> [image: Seasons' Current Conditions (Parenthetical).PNG]
> Under Current Conditions in the Seasons skin, the Barometer value is 
> appended with a parenthetical value; e.g., 1024.3 hPa(-0.1)
>
> 1) What is the meaning of the appended parenthetical value? In all 
> truthfulness, I've only now have just taken note of it as I prepare to make 
> a calibration adjustment on the display console (Ambient Weather WS-2000), 
> my first such adjustment since enlisting weewx. My guess is that it shows 
> the change in pressure when compared to the previous report; e.g., 5 
> minutes ago.
>
> 2) The related question to this pertains to the first value; e.g., 1024.3 
> hPa, should it be exactly identical with the value shown on the display 
> console when the pressure is steady through multiple update intervals?
>
> I've read  
> that weewx receives 'pressure' from FineOffset hardware and then calculates 
> 'barometer' values. This brings up two more questions.
>
> 3) What is the formula that is being used and to how many places to the 
> right of the decimal is this formula applied?
>
> 4) Loop packets suggest that 'pressure' is being reported by the hardware 
> in units of inHg to 2 significant digits, is this a false assumption? and 
> how might it be proven? 
>
> pi@raspberrypi:/etc/weewx $ sudo /etc/init.d/weewx stop
> [ ok ] Stopping weewx (via systemctl): weewx.service.
> pi@raspberrypi:/etc/weewx $ sudo weewxd weewx.conf
> LOOP:   2019-04-28 10:51:20 EDT (1556463080) altimeter: 29.8717169546, 
> appTemp: 42.072810622, barometer: 29.8843336142, cloudbase: 3250.42822233, 
> dateTime: 1556463080, dewpoint: 33.8944955053, heatindex: 47.5, humidex: 
> 47.5, inDewpoint: 41.4872761332, inHumidity: 39, inTemp: 67.3, maxSolarRad: 
> 815.85703395, outHumidity: 59, outTemp: 47.5, pressure: 29.71, radiation: 
> 881.07, rain: 0.0, rainRate: 0, usUnits: 1, UV: 8, windchill: 46.1399181728, 
> windDir: 290, windGust: 4.5, windSpeed: 3.8
> LOOP:   2019-04-28 10:51:36 EDT (1556463096) altimeter: 29.8717169546, 
> appTemp: 42.2517904021, barometer: 29.8843336142, cloudbase: 3154.86029954, 
> dateTime: 1556463096, dewpoint: 34.3149943656, heatindex: 47.5, humidex: 
> 47.5, inDewpoint: 41.4872761332, inHumidity: 39, inTemp: 67.3, maxSolarRad: 
> 816.299633379, outHumidity: 60, outTemp: 47.5, pressure: 29.71, radiation: 
> 878.37, rain: 0.0, rainRate: 0, usUnits: 1, UV: 8, windchill: 46.3046187182, 
> windDir: 307, windGust: 4.5, windSpeed: 3.6
> LOOP:   2019-04-28 10:51:52 EDT (1556463112) altimeter: 29.8717169546, 
> appTemp: 41.6321945021, barometer: 29.8843336142, cloudbase: 3154.86029954, 
> dateTime: 1556463112, dewpoint: 34.3149943656, heatindex: 47.5, humidex: 
> 47.5, inDewpoint: 41.4872761332, inHumidity: 39, inTemp: 67.3, maxSolarRad: 
> 816.741118563, outHumidity: 60, outTemp: 47.5, pressure: 29.71, radiation: 
> 877.51, rain: 0.0, rainRate: 0, usUnits: 1, UV: 8, windchill: 45.478419953, 
> windDir: 312, windGust: 5.8, windSpeed: 4.7
> LOOP:   2019-04-28 10:52:08 EDT (1556463128) altimeter: 29.8717169546, 
> appTemp: 42.6460787021, barometer: 29.8843336142, cloudbase: 3154.86029954, 
> dateTime: 1556463128, dewpoint: 34.3149943656, heatindex: 47.5, humidex: 
> 47.5, inDewpoint: 41.4872761332, inHumidity: 39, inTemp: 67.3, maxSolarRad: 
> 817.181491045, outHumidity: 60, outTemp: 47.5, pressure: 29.71, radiation: 
> 874.46, rain: 0.0, rainRate: 0, usUnits: 1, UV: 8, windchill: 47.5, windDir: 
> 291, windGust: 4.5, windSpeed: 2.9
> LOOP:   2019-04-28 10:52:24 EDT (1556463144) altimeter: 29.8717169546, 
> appTemp: 40.9662707821, barometer: 29.8843336142, cloudbase: 3060.68950083, 
> dateTime: 1556463144, dewpoint: 34.7293458799, heatindex: 47.5, humidex: 
> 47.5, inDewpoint: 41.4872761332, inHumidity: 39, inTemp: 67.3, maxSolarRad: 
> 817.620605418, outHumidity: 61,