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Wind speed

Discussion specific to Fine Offset and similar rebadged weather stations
Samuel
Posts: 53
Joined: Wed 22 Oct 2008 7:31 pm
Weather Station: WH1080
Operating System: vista
Location: Pålsboda, Sweden
Contact:

Wind speed

Post by Samuel »

I have a Easyweather WH1080 and I have problems with the Wind speed i Cumulus, the speed is to high on the mainscreen its not the same as in the easyweather display.
Yesterday i downloaded 1..8.3 build472 but the problem is still there.
Late yesterday I change calibration but that doesnt change the value on the mainscreen.
This morning I realased that calibration has change the wind value on the graphs.
The calibration only change the graphvalue and not the mainscreenvalue.
The easyweatherprogam show the same value as in the easyweatherdisplay but it is a higher value in Cumulus why ? All the other values are exactly the same but not windspeed.
:? :?:
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steve
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Re: Wind speed

Post by steve »

Yes, you're right the 'latest' figure shows the uncalibrated value - I'll fix that. The other two wind figures (the more useful ones) show calibrated values.

I don't understand why you're using the calibration facility in the first place. It's only going to confuse things if we're trying to explain the difference between what you're seeing on the console and in Cumulus, so please turn it off for now.

Are you getting Cumulus to calculate a 10-minute average wind speed, or are you using the station values for average wind speed? Are you comparing like with like (gusts vs average, for example?)

Could you please turn off calibration, and give me some examples of what you are seeing in Cumulus (the three values of 'Latest', 'Gust', and 'Average' - a screen shot would be preferable), and what the station shows at that moment.

Thanks,
Steve
Steve
Samuel
Posts: 53
Joined: Wed 22 Oct 2008 7:31 pm
Weather Station: WH1080
Operating System: vista
Location: Pålsboda, Sweden
Contact:

Re: Wind speed

Post by Samuel »

windgraph and the screens, the screenshots are taken in the same minute
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steve
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Re: Wind speed

Post by steve »

Thanks, Samuel. Are you running Easyweather and Cumulus at the same time? Using the easyweather.dat method? I would rather people didn't use that now, and used the direct method instead. Cumulus has a lot less data to use in this mode, this may account for some of the differences - what is your station logging interval set to?
Steve
Samuel
Posts: 53
Joined: Wed 22 Oct 2008 7:31 pm
Weather Station: WH1080
Operating System: vista
Location: Pålsboda, Sweden
Contact:

Re: Wind speed

Post by Samuel »

I use fineoffset, I try use the dat file but it sometimes trouble with the datfile cuorius values. It looks at the values in the datafiles are almost same but it shows wrong value on mainscreen.
I only use calibration to test yesterday because I could not understand why it was higher value in Cumulus
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steve
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Posts: 26672
Joined: Mon 02 Jun 2008 6:49 pm
Weather Station: None
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Location: Vienne, France
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Re: Wind speed

Post by steve »

It's a bit difficult to compare wind values shown on easyweather with values shown on Cumulus when they're not running at the same time - but don't try that, and please do continue to use the 'Fine Offset' setting.

You didn't tell me whether you were using the Cumulus 10-minute average or or not?

The best thing would be to compare the values shown by Cumulus with the values shown by the console display at the same time, could you do that and give me some of the figures?
Steve
Samuel
Posts: 53
Joined: Wed 22 Oct 2008 7:31 pm
Weather Station: WH1080
Operating System: vista
Location: Pålsboda, Sweden
Contact:

Re: Wind speed

Post by Samuel »

Just now I am not using Cumulus 10-minute average but I try it some periods yesterday.
Just now the wind is 3,7m/s on the EWdisplay and 5,4m/s on the Cumulus mainscreen.
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steve
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Re: Wind speed

Post by steve »

Best to stick to the station values for now so we're comparing like with like. It's actually difficult to see what could go wrong; Cumulus reads the latest values from the station, converts the units if necessary (so in your case there is no conversion as the data is supplied in m/s and you're displaying in m/s) and displays them.

The only thing that I can think of that could go wrong is that somehow in your case Cumulus is reading the wrong memory location from the console. Do any other Fine Offset users reading this think that Cumulus is displaying the wrong wind values?

Is it possible that the console value is the current average and you're comparing it with the Cumulus gust figure? Can you give me all three Cumulus values and the two values from the console (I assume the console displays wind and gust)?
Steve
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dane
Posts: 417
Joined: Wed 10 Sep 2008 2:15 pm
Weather Station: Rosenborg 68700
Operating System: Win10 Ult., 64-bit, RaspberryPi
Location: Gilleleje, Denmark

Re: Wind speed

Post by dane »

I just ran a short test with EasyWeather and Cumulus side by side - both in "Direct" mode.
And the wind speed numbers are exactly the same.
EasyWeather seems to update every 16 seconds, Cumulus every 15 seconds.

(I have no idea what has happened to EasyWeather's relative pressure :roll: - it's OK if not run with Cumulus. So I shall take Steve's advice and not run both at the same time)
Ib
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steve
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Joined: Mon 02 Jun 2008 6:49 pm
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Location: Vienne, France
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Re: Wind speed

Post by steve »

Thanks, Ib. I'm surprised that it works at all, running both at the same time! But anyway, that does seem to confirm that Cumulus is showing the correct values.

Your screenshot of Easyweather reminds me that I should look into internationalising Cumulus. I was asked by someone the other day where they could download the French version :-(
Steve
Samuel
Posts: 53
Joined: Wed 22 Oct 2008 7:31 pm
Weather Station: WH1080
Operating System: vista
Location: Pålsboda, Sweden
Contact:

Re: Wind speed

Post by Samuel »

:oops: When I looked at Danes screenshot I see my problem, I looked at "Latest" value in Cumulus but the wind value on the easyweather display and program is the same as "Average" in Cumulus. Easywheather does not have "Latest value" as I can see.
So stupid of me !! :oops:
I downloaded Cumulus for the first time late tuesday evning this week so I am not so familiar with the program yet.

When I run the program side by side it works well but it did som bad things with EasyWeather.dat file a lot off rain and stupid pressure values etc. so I have to take it away and let the station make a new file. (I started the easyweather station this weekend so I didnt lose any data.
Now when I see the vlues is ok , I some day do the put my wheater on my website.
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Samuel
Posts: 53
Joined: Wed 22 Oct 2008 7:31 pm
Weather Station: WH1080
Operating System: vista
Location: Pålsboda, Sweden
Contact:

Re: Wind speed

Post by Samuel »

:oops: When I looked at Danes screenshot I see my problem, I looked at "Latest" value in Cumulus but the wind value on the easyweather display and program is the same as "Average" in Cumulus. Easywheather does not have "Latest value" as I can see.
So stupid of me !! :oops:
I downloaded Cumulus for the first time late tuesday evning this week so I am not so familiar with the program yet.

When I run the program side by side it works well but it did som bad things with EasyWeather.dat file a lot off rain and stupid pressure values etc. so I have to take it away and let the station make a new file. (I started the easyweather station this weekend so I didnt lose any data.
Now when I see the vlues is ok , I some day do the put my wheater on my website.
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dane
Posts: 417
Joined: Wed 10 Sep 2008 2:15 pm
Weather Station: Rosenborg 68700
Operating System: Win10 Ult., 64-bit, RaspberryPi
Location: Gilleleje, Denmark

Re: Wind speed

Post by dane »

Samuel,
I run both (out of curiosity and for comparison) - but not at the same time.
I normally run EasyWeather first thing in the morning, just to keep my EasyWeather.dat file up to date.
Then I stop it and bring up Cumulus and leave that running (most of the time).

By the way: is your EasyWeather program version 2? then there is a version 4 that you can download from Fine Offset www.foshk.com (from the page for your weather station). The earlier versions sometimes had "funny" rainfall figures.
Ib
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steve
Cumulus Author
Posts: 26672
Joined: Mon 02 Jun 2008 6:49 pm
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Location: Vienne, France
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Re: Wind speed

Post by steve »

It's OK, Samuel, it can be a bit confusing.

Cumulus reads two values from the station every 15 seconds (this figure is for Fine Offset stations, though they might not get updated in the station that often, I think it may be about 48 seconds). Let's call them 'station gust' and 'station speed speed'. Exactly what these values really represent depends on the type of station, and I don't know how Fine Offset stations calculate them.

Cumulus displays each 'station gust' value as 'Latest'. It displays the highest of these from the last 10 minutes as 'Gust'. If you don't have the 'calculate 10-minute average' option set, Cumulus displays the 'station speed' figure as 'Average'. If you do have the 10-minute average option set, it calculates a running 10-minute average of the 'station gust' figures and displays that as 'Average', and completely ignores the 'station speed' figure.
Steve
Samuel
Posts: 53
Joined: Wed 22 Oct 2008 7:31 pm
Weather Station: WH1080
Operating System: vista
Location: Pålsboda, Sweden
Contact:

Re: Wind speed

Post by Samuel »

Now I have make a test weatherweb, it works fine !! :D
Nice program and instructions Steve !!
I have som work left to do som changes and translation to swedish and I do it som day (or night)

www.ostensson.se/vader
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