這種方法有多準確, 以下是一個事例, 上面是雲量曲線(或溫差曲線), 下面是最後的全天攝影機(AllSky camera)圖像。
按溫差測出的雲量是全晚都算好天, 但實時的全天攝影機所見就全晚都全天堂雲

That's exactly right! In fact, I have to adjust these thresholds quite often (sometimes even through the night) in order to get accurate results.HK.Raymond.Tse 寫:Most cloud sensors have to be calibrated on the range of sky temperate difference to distinguish between clear sky, slight cloud, full cloud coverage & rain.
These parameters can be manually set. The most practical method is real site testing especially for partial cloud coverage.
Find a man/site attendant to view the sky camera or the observatory site. If you see some clouds, adjust the parameters, so that the cloud sensor report partial cloud coverage.
If the sky is fully covered, adjust the parameters so that the cloud sensor should report full coverage.
Every cloud sensor must be fine-tuned from time to time.
Raymond Tse
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