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Calculate Missing Values: Difference between revisions
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# Current air pressure (absolute or sea-level)
By default [[Cumulus.
Cumulus also expects that your weather station can provide:
* Air pollution measurement
There are some configuration settings [[Cumulus.
===How Cumulus might transform a Source Value===
*For some weather data processed by Cumulus the value sent by the weather station and that used by Cumulus will be different:
** This can be because the units used by the weather station, and the units required by the Cumulus user are different (and Cumulus allows the user to select the units in which values will be stored)
** This can be because the user has entered some calibration settings. The exact settings available vary for different weather data, but in some cases a second order multiplier is available (the square of the input value is multiplied by the second order multiplier), a first order multiplier is available (the input value is multiplied by the first order multiplier), and an offset is available (added to the input value). If you want to understand how this works, please see [[Cumulus.
**A weather station might use a rainfall counter, Cumulus converts it to a rainfall rate (based on difference between two counter readings scaled up to represent amount per hour)
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