On 18/10/2020 22:16, Keith Harris wrote:
On Sunday, 18 October 2020 20:47:53 UTC+1, JGD wrote:
I disagree

I know :-)

- especially for parameters such as wind direction and speed. In fact, I get worried if I see a graph of data that remains at the same value for more than three or so minutes.

New wind readings are available (approximately) every 2.5 secs. So my
view is that a 1 minute interval doesn't begin to capture the detail in
the wind record. So you might as well use eg 5 mins and avoid a lot of
redundant data. The time of any peak gust should be captured separately.

If you use Cumulus (either 1 or MX) then this is certainly not an issue. Even exporting to something like Excel and using its graphing is not an issue.


My concern is that there are people out there with 25 years' (and more)
of Davis data. I'm sure that it's less of a problem with just a few
years. But 25+ years at 1-minute interval exported to a single file
gives quite a chunky file.

But, whatever, we've all set out our views and reasoning so Keith can
put all the options into a hat and draw one out :-)

Thank you for all the replies on this one, I think I'm going to change to 5 minute interval. It will mean I'll have to modify a spreadsheet I use when I 'Export data' and use an excel spreadsheet to calculate various bibs and bobs, but not a major issue.

Keith (Southend)



Hi Keith

I have 20 years of Weatherlink data and have always had it set to a 10
minute interval. I recall the reasoning was that this was the standard
interval for average wind speed and gust data. However,
weatherunderground is beavering away in the background on a 5 minute
interval. I remember when Weatherunderground offered 'Rapid Fire' which
was more or less live but I can't find this option now. Weatherlink.com
is set to 5 minutes but again records Hi/low data to the time of
occurrence-I believe. The VP2 monitor looks to be data live as well-but
you can't sit watching that all day. Just observed that Weatherlink.com
bulletin works to a shorter interval as well-judging by the wind speed
display.



--
George in Swanston, Edinburgh, 575'asl
www.swanstonweather.co.uk