I'm still trying to wrap my head around wind data in WeeWX... Does that
mean that in the Seasons skin, the weekwinddir, monthwindir, and
yearwinddir plots are not a vector average? If yearwinddir plot was
something like below, would it generate a vector average?
[[[yearwinddir]]]
yscale = 0.0, 360.0, 45.0
line_type = None
marker_type = box
marker_size = 2
#[[[[windDir]]]]
[[[[wind]]]]
aggregate_type = vecdir
When I changed the yearwinddir plot to the above, it ran and I got what
looked like a different plot.
Thanks. rich
On Monday, 17 October 2022 at 09:05:37 UTC-4 [email protected] wrote:
> Calculating the vector averaged direction requires a vector, so the
> observation type is 'wind', which is a vector, not 'windDir'. The
> aggregation that returns direction from a vector is 'vecdir', so, you want:
>
> (start_ts, stop_ts, dirs) = weewx.xtypes.get_series('wind', x_domain,
> db_lookup(data_binding=binding), 'vecdir', aggregate_interval)
>
> Unfortunately, 'wind' appears only in the daily summaries. This means
> aggregate_interval must be multiples of one day. This restriction could be
> relaxed should someone want to write the necessary xtypes extension.
>
>
>
> On Sun, Oct 16, 2022 at 6:35 AM James Taylor <
> [email protected]> wrote:
>
>> Hello
>>
>> Following on from https://github.com/weewx/weewx/issues/798, I've been
>> trying to replicate and understand weewx behaviour when it comes to using
>> get_series and get_aggregate.
>>
>> So if you are trying to aggregate winddir for graphing purposes, you want
>> to get a wind vector which I understand
>>
>> Here is my example where my data is being archived every 300 seconds
>>
>> (time_start_vt, time_stop_vt, obs_vt) = weewx.xtypes.get_series(
>> obs_lookup, x_domain, db_lookup(data_binding=binding), aggregate_type,
>> aggregate_interval)
>>
>> obs_lookup is windDir
>> Start time is 1665440100 and end time is 1665442800
>> x_domain entries are 1665440100 and 1665442800
>> aggregate_type is avg
>> aggregate_interval is 300
>> ([355.0, 355.0, 355.0, 355.480837630687, 0.0, 0.0, 0.0, 0.0,
>> 4.249651034454402], 'degree_compass', 'group_direction')
>> aggregate_interval is 900
>> ([355.0, 118.49361254356234, 1.416550344818134], 'degree_compass',
>> 'group_direction')
>>
>> I can see for the second group it is returning an average rather than a
>> vector value of around 358.5, but trying to understand how we should be
>> coding it.
>>
>> If I can change to aggregate of vecdir or vecavg I get a UnknownType error
>>
>> Any help will be appreciated here.
>>
>> James
>>
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