[CF-metadata] The use of CF cell constructs for point data
j.m.gregory at reading.ac.uk
Mon Apr 9 13:07:53 MDT 2012
> The GOES-R system will be producing a hemispheric lightning detection product.
> It will be an array of lightning detection that occur within some number of seconds across the western hemisphere (i.e. it is not a gridded product).
Is is a timeseries of values, for probability or number of occurrence or
yes/no - something like that? If so, I don't think there's a featureType for
it yet. It's a timeseries which doesn't apply to a station. It would be
among the list of things not covered by chap 9 yet (see sect 9.1). But you
don't need to give it a featureType. Chap 9 is primarily for datasets which
need to use the techniques provided there for saving space.
> A lightning detection has a center location, and needs to be associated with an area and an interval of time.
> (2) Use the cell "bounds" construct to capture the time interval.
Fine. cell_methods should say "time: sum", where time is the name of the time
dimension. From your description, I think "sum" is appropriate because this
quantity is extensive in time. The probability would be larger if the interval
were longer. See App E.
> (3) Use the cell "cell_measures" construct to capture area (i.e. ":cell_measure = area: lightning_detection_area").
That's not quite right, I think. The entry is to indicate what kind of
statistic this is, and I would say that again this is extensive. If you
considered an area smaller than the W hemisphere, the probability would be
smaller, for instance. So I would suggest "area: sum".
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