Chapter 4 ______________________________________________________ Functional Description
VAISALA_______________________________________________________________________ 49
Activation
After you have received the option code, activate the sky condition
algorithm as follows:
CEILO > advanced
Service password accepted.
CEILO > set option sky_cond on 63273
OK.
Select the sky condition message type (msg2_base or its subclass) to be
reported:
CEILO > set message type msg2_base
OK
CEILO>close
Algorithm Overview
The sky condition algorithm is calculated every five minutes based on
data collected during the last 30 minutes. The last 10 minutes are double-
weighted to make the algorithm more responsive to variations in
cloudiness.
Operation of the sky condition algorithm is shown in Figure 18 on page
50. Instead of form
ing a histogram of hit heights, the algorithm uses both
height and timing information to find hits close to each other. These hits
are combined into clusters and a height value is calculated for each
cluster. This height gives the base height of a cloud or cloud layer
represented by the cluster. The algorithm reports layers by combining
clusters whose heights are close to each other and then selecting clusters
that cover the greatest amount of sky.
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