Dear All:
we requested the cloud mask and related quantities last year, and I had the impression these standard_names were accepted.
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
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.
I asked Alison in December about why these had not made it into the CF standard name table, and she said it was on her queue..
The specific thread starts at:
http://mailman.cgd.ucar.edu/pipermail/cf-metadata/2013/056483.html
very respectfully,
randy
On Feb 18, 2014, at 12:53 PM, Jonathan Gregory <j.m.gregory at reading.ac.uk> wrote:
> Dear Kris
>
> cloud_binary_mask would be exactly the right standard name, I think, as Jim
> suggests.
>
> Cheers
>
> Jonathan
>
>> We are detecting cloudy and clear sky pixels using a combination passive infrared and visible satellite imagery. The community typically calls this product a "cloud mask", i.e. byte value 0=clear sky pixel, 1=cloudy pixel. I am reviewing the CF Standard Name table and I see no name that would correspond to this type of product. I see the name "cloud_area_fraction", but the concept of "fraction" would imply that one considers several pixels in a region and computes the ratio of cloudy pixels relative to the total number of pixels in the region. This is not being done with our processing. I'd recommend something like "cloudy_satellite_pixel_detection", but am open to other suggestions
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____________________________________
Randy C. Horne (rhorne at excaliburlabs.com)
Principal Engineer, Excalibur Laboratories Inc.
voice & fax: (321) 952.5100
url:
http://www.excaliburlabs.com
Received on Tue Feb 18 2014 - 11:32:40 GMT
