Dear Jonathan: Thanks for taking the time to reply. In the case of
GOES-R, the ground system will not know what type of fire it is. Because
our products generally coverage very large areas, it will be common for
many fires to be detected and included in instances of our products. The
imager aboard the spacacraft has several IR channels, and, basically, the
ground processing software looks for "hot" pixels that is on land and where
it is not cloudy. What about rain, smoke, dust, and volcanic ash
area_types ?
Also, in you reply below, you state that area_type could be used as a
dimension of data variables. I could not find anything in the CF standard
that explains this (maybe you are referring to the "where typevar"
discussion in CF standard para. 7.3.3.).
very respectfully,
randy
----------------------------------------
From: "Jonathan Gregory" <j.m.gregory at reading.ac.uk>
Sent: Monday, July 08, 2013 3:11 PM
To: cf-metadata at cgd.ucar.edu
Subject: [CF-metadata] a conceptual question about "area_types"
Dear Randy
Yes, I would say that fire could be an area type, except that it would be
nice
to be more specific about it. Does it mean wildfire? Expanding the area
type
is not a slippery slope; the table was created in order to avoid expanding
the
number of standard names because of the introduction of more types, as well
as
so area type could be used as a dimension of data variables.
Cheers
Jonathan
----- Forwarded message from Randy Horne <rhorne at excaliburlabs.com> -----
> Date: Sun, 7 Jul 2013 13:19:05 -0400
> From: Randy Horne <rhorne at excaliburlabs.com>
> To: "cf-metadata at cgd.ucar.edu" <cf-metadata at cgd.ucar.edu>
> Subject: [CF-metadata] a conceptual question about "area_types"
> X-Mailer: Apple Mail (2.1508)
>
> Folks:
>
> The current area_type table includes "cloud", "snow", and "vegetation".
These are environmental conditions whose existence and location vary over
time.
>
> In GOES-R, we are generating rainfall, fire, aerosol (smoke and dust),
and volcanic ash product files. These product files contain statistics
(e.g. min, max, mean, std dev) that are associated with only those regions
on the earth where these environmental conditions are found. For the
variables containing these statistics, we are using cell_methods. A "where
fire" clause would make sense (if "fire" were in the area_type table). It
would seem a "where fire" clause is conceptually the same as "where
cloud".
>
> If they are the conceptually same, there would be value to expanding the
area_type table. However, I can see a slippery slope forming as the
area_type table could grow large.
>
> If they are not conceptually the same, what am I missing ?
>
> very respectfully,
>
> randy
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> CF-metadata at cgd.ucar.edu
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----- End forwarded message -----
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