[CF-metadata] daily maximum of running 8-hour means

From: Schultz, Martin <m.schultz>
Date: Thu, 20 Oct 2011 16:47:35 +0200

Dear Jonathan,

     oh! The wonderful world of semantics. I guess we could argue for a while if the "interval" is supposed to be 1-hour or 8-hours in the case of a running mean. But I would be prepared to settle for 1-hour as "original resolution", so let me answer your question directly: YES - there will be a need for this. Current air quality data bases - the largest are probably the American AQS and the European AirBase systems - do store hourly data and "daily max 8-hour mean" values, and you want to be able to differentiate between those automatically (say in a catalogue application such as GI-Cat or Core.uFind). While this could in principle be achieved by other means (extra XML metadata), it would indeed be valuable to have this information also stored directly in the netcdf file in a way that is easily distinguishable (and automatically distinguishable) from the "original" 1-hour data.

    The current suggestion cell_methods = "max (interval: 1 hour comment: 8-hour running means at 1-hour intervals)" frankly doesn't sound right and rather convoluted. I'd much rather see something like "max (interval: 8-hour running means at 1-hour intervals)", or, if this would make it easier to formulate a grammar rule "max (interval: running means of 8-hours at 1-hour intervals)". In the latter case, the term "running mean" would substitute the immediate specification of the interval and fork the parser off to analyze the rest of the string.

Cheers,

Martin


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Received on Thu Oct 20 2011 - 08:47:35 BST