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Cloud height [actual_thb0_cloudheight_m] SOLVED
Posted: Sun Feb 21, 2010 9:35 pm
by gm4jjj
I am getting a different value for [actual_thb0_cloudheight_m] and the cloud height reported by WDL (in Clientraw.txt).
Example: [actual_thb0_cloudheight_m] = 1838m v WDL = 195m
Which is correct and why are they different?
Re:Cloud height [actual_thb0_cloudheight_m] and WDL Cloud he
Posted: Mon Feb 22, 2010 12:55 am
by cgn
The cloudheight will be calculated with this formula (approx.):
(temperature - dewpoint) * 125 = cloudheight (in m).
So calculate with your temperature and dewpoint and decide which value is correct.
Re:Cloud height [actual_thb0_cloudheight_m] and WDL Cloud he
Posted: Mon Feb 22, 2010 10:17 am
by gm4jjj
Is that in degrees C or F?
Assuming it is C as you have height in m
Worked example-
With Temp -1.0 Dp = -2.9 :
Calculated is approx 237m
The WDL figure in the cleintraw.txt file (calculated by METEOHUB not WD) is 232m
The figure calculated by METEOHUB [actual_thb0_cloudheight_m] is 1700m - something seriously wrong there!
Re:Cloud height [actual_thb0_cloudheight_m] and WDL Cloud he
Posted: Mon Feb 22, 2010 10:26 am
by gm4jjj
EDIT I may be using the wrong thing - Doh, I am using inside temp sensor for Meteohub ! Let me find the outside temp sensor and try again!
Yes! - I should have used [actual_th0_cloudheight_m]