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how dose wind direction and wind speed calculate?


to-ya farm Apr 26, 2021 02:12 AM

hi.

1. wind direction

i look at data(2021-01-29 07:00~08:00 fri).

it's wind direction data. 1 minute average and 1hour average.

how does 1hour average make to use 1 minute average.

2. North is expressed as 0 degree.

 is it 0 degree ok? or 360 degree is better?

 when i look at graph, i feel 360 degree would be better.

thx.

https://blog.naver.com/jowh4998/222323747387


Nico May 1, 2021 08:35 AM

1)
this depends on your code (CR1X) running on your logger
The output variable is called 'Wind_Direction', so anything really could have been done to the 1 minute data to get to that.
Without code there is no way anyone here can tell you what is going on.

2)
0 deg usually is North and 90 deg East if you look at windroses (compass).
So yes, 0 deg for North is fine.


Makada May 1, 2021 11:45 AM

If you want to use the data from a one minute table to use in an hourly table, you have to use the tablename.fieldname instruction to have a public variable one minute data. Then use that variable in your hourly table.

Heres an example:

https://www.campbellsci.com/blog/programmatically-access-stored-data-values


Nico May 1, 2021 06:06 PM

@Makada

to-ya_farm has got public hourly and public minute data already. Follow his link. He's got screenshots of ProView showing both time series for the same period.

to-ya_farm is asking why the hourly value is at ~240 for that time period while the minute data for that same time period contains some values with zero readings while the other values sit around the ~240 mark only. The hourly average would be a bit lower than that due to some of the readings being zero.
But as I said, his output value doesn't have the '_Avg' or other variable name extension that could tell us how the hourly table got to that value.
To help him we would need the code running on that logger or someone knows what code that is (if its a commissioned system) who runs the same code and recognizes it and already knows the code.

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