Webtags (preserving history): Difference between revisions

There are a set of web tags for 'recent historical data', based on an array stored by Cumulus giving data values from 1 minute ago, up to 1 week ago, in 1 minute intervals. Note that values over 12 hours old are initialised from the log files whenAs Cumulus starts,runs so theyit will initiallyadd havethe alatest resolution accordingvalues to the loggerarray intervalwith youfull have set in Cumulus and/or your station. You'll get the nearest value if you ask for one for which there is currently no exact matchresolution, and theshift first tag listed tells you that nearest time. More recent dataexisting values arealong based onso those at,older andthan since,7 start-updays as the first tag willfall reportoff. As[[#No_Commas]] Cumulusversions runsof itthe updatesarray allare valuesavailable for timesuse sincein it started with full resolutionscript.

You specify howwhich oldvalue you want from the value to bearray by using parameters on the web tags for number of days ago, hours ago, and minutes ago. For example, <#RecentOutsideTemp m=1> will give the temperature one minute ago, <#RecentOutsideTemp h=1> will give the temperature one hour ago (as will <#RecentOutsideTemp m=60>), and <#RecentOutsideTemp d=1> will give the temperature one day ago. <#RecentOutsideTemp d=1 h=1 m=1> will give the temperature one day, one hour and one minute ago. All values supplied for parameters must be whole numbers. If you don't supply any parameters, the result is undefined.

Although 'Apparent Temperature' is not included as a tag, it can be [[FAQ#What_formula_does_Cumulus_use_for_Apparent_Temperature.3F | calculated]] in a script from recent 'outside temperature', 'wind speed', and 'relative humidity' values (using the same time selection for all).