#152: Time mean over area fractions which vary with time
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Reporter: martin.juckes | Owner: cf-conventions@…
Type: enhancement | Status: new
Priority: medium | Milestone:
Component: cf-conventions | Version:
Resolution: | Keywords:
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Comment (by martin.juckes):
Hello Karl, Jonathan,
I've copid Karl's proposed text into the ticket .. I thought it might make
the discussion easier. I've also split it into 3 parts .. (1) modification
of existing text, (2) modification of example 7.6 caption, (3) new text.
The last is a variation on my original submission .. expanded.
I'm happy with with the first two of these parts. For the 3rd part, I see
an ambiguity between the text saying "the interpretation more generally is
that a “weighted” mean is reported" and the first example (area: mean
where sea_ice time: mean) which I would not interpret as a weighted mean.
This latter interpretation is supported by Jonathan's last comment, but it
is not, I think, consistent with the bracketted part of Karl's text about
dealing with time series when sea_ice is completely absent for part of the
time period. In such cases, I would interpret `area: mean where sea_ice`
as yielding a time series with some missing values, when sea_ice is
completely absent, and `time: mean` would then also give a missing value.
The construct `area: mean where sea_ice time: mean where sea_ice` would be
needed to average over the portions of the time series for which sea ice
is present,
Martin
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Ticket URL: <http://cf-trac.llnl.gov/trac/ticket/152#comment:19>
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