Dear Jonathan and Jim,
I have seen your last and recent words on the mask proposals, and I have
incorporated your comments. I believe we are all in agreement, and
thank you for your work. I have written out the proposed variables and
definitions below according to our latest agreement. Please let me know
the procedure to formally finish the proposal process for these four new
mask standard names.
Sincerely,
Charles Paxson
aerosol_binary_mask: X_binary_mask has 1 where condition X is met, 0
elsewhere. 1 = aerosols present, 0 = aerosolsabsent. Note that if no
threshold is supplied, the binary mask is 1 if there is any non-zero
amount of aerosol.
smoke_binary_mask: X_binary_mask has 1 where condition X is met, 0
elsewhere. 1 = smoke present, 0 = smoke absent. Note that if no
threshold is supplied, the binary mask is 1 if there is any non-zero
amount of smoke.
dust_binary_mask: X_binary_mask has 1 where condition X is met, 0
elsewhere. 1 = dust present, 0 = dust absent. Note that if no
threshold is supplied, the binary mask is 1 if there is any non-zero
amount of dust.
cloud_binary_mask: X_binary_mask has 1 where condition X is met, 0
elsewhere. 1 = cloud present, 0 = cloud absent (clear). Note that if
no threshold is supplied, the binary mask is 1 if there is any non-zero
amount of cloud
On 05/21/2013 05:25 PM, Jonathan Gregory wrote:
Dear Charles
Thank you for your email, and the subsequent one to Jim. In my earlier posting
I was not particularly arguing against the proposal, but I thought the
question should be asked. Evidently it is your intention that quantities with
these names should indeed be regarded as comparable. That is OK. If at some
point there arises a need for more specifically defined binary masks, other
standard names could be proposed for them.
You propose to include a nominal threshold of zero, indicating that any amount
of cloud etc. constitutes "presence". I think we could avoid that need, and
the related need to introduce standard names for the quantities in which the
threshold was set, by stating in the definition that if no threshold is
supplied, the binary mask is 1 if there is any non-zero amount of cloud etc.
Best wishes
Jonathan
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--
Charles Paxson
System Engineer
Atmospheric and Environmental Research (AER), Inc.
a Verisk Analytics Company
131 Hartwell Avenue, Lexington, MA 02421-3126
office: 781-761-2209
fax:781-761-2299
www.aer.com
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