There may be a complex algorithm underlying the binary state to be represented by these standard names, but there clearly is a threshold for each binary state. There is some level of each constituent for which the corresponding algorithm will produce zeros. It seems to me that it would better to state even a rough estimate of the threshold in each case than to leave it unstated.
Jim Biard
Research Scholar
Cooperative Institute for Climate and Satellites
Remote Sensing and Applications Division
National Climatic Data Center
151 Patton Ave, Asheville, NC 28801-5001
jim.biard at noaa.gov
828-271-4900
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On May 15, 2013, at 3:34 PM, Charles Paxson <cpaxson at aer.com> wrote:
> Dear CF Metadata Users Group,
>
> Through observations and analysis, GOES-R weather products produce binary masks for: aerosols, smoke, dust and clouds. No coordinate value is warranted (i.e. CF Metadata standard surface_snow_binary_mask) for any of these four proposed quantities, since a complex set of tests for each case, such as using brightness temperatures, are used to derive signatures of the four atmospheric constituents. The proposed masks are analogous and defined in a similar way as the CF Metadata standard names: land_binary_mask and sunlit_binary_mask.
>
> aerosol_binary_mask: X_binary_mask has 1 where condition X is met, 0 elsewhere. 1 = aerosols present, 0 = aerosols absent
> smoke_binary_mask: X_binary_mask has 1 where condition X is met, 0 elsewhere. 1 = smoke present, 0 = smoke absent
> dust_binary_mask: X_binary_mask has 1 where condition X is met, 0 elsewhere. 1 = dust present, 0 = dust absent
> cloud_binary_mask: X_binary_mask has 1 where condition X is met, 0 elsewhere. 1 = cloud present, 0 = cloud absent (clear)
>
> Please accept these four mask names for inclusion into the CF Metadata standard.
>
> Sincerely,
>
> Charles Paxson
>
>
>
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> CF-metadata at cgd.ucar.edu
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Received on Fri May 17 2013 - 06:54:52 BST
