[esip-semantictech] [EXTERNAL] Re: NASA GCMD Keywords Version 9.0 Released (2019-11-12)

Tue Jan 14 10:46:41 EST 2020

Siri-Jodha,

Regarding the measurement keywords, the EOSDIS data centers needed a more fine-grained list of specific measurements (e.g.atmosphere_absorption_optical_thickness_due_to_black_carbon_ambient_aerosol_at_532nm) than the science keywords offered.
The recommendation for this was put forward in an ESO review, approved by ESDIS, and there is a preliminary list of 100 measurements. We plan to put forward additional measurement keywords in an upcoming keyword release,  and we can add interested folks
here in that review. The measurement keywords specifically support the NASA UMM Variables Model (UMM-Var) evolution which has a field called 'MeasurementName' that  allows metadata curators to provide community sourced names to further describe variable
data.

We are also planning to talk to the EOSDIS data centers and others about their data format keywords in preparation for an ESO review. The end-user goal is to allow users to search for data specifically by its format and to address the following use case:
As a user, I want to search for collections with granules that have a specific data format (e.g., NetCDF, HDF5, etc).

The initially discussion here has been very helpful.

Thanks,

Tyler Stevens
KBR | Senior Discipline Engineer, NASA EED-2

Office: 301-851-8113 | Tyler.B.Stevens at nasa.gov

<https://mail02.ndc.nasa.gov/owa/redir.aspx?C=V8CgRYg3bQhQJTfp1SZy8qz17zr57afdr3RPnU2Q1JJ5D_SfSAfVCA..&URL=http%3a%2f%2fgcmd.nasa.gov%2f>

________________________________
From: esip-semanticweb <esip-semanticweb-bounces at lists.esipfed.org> on behalf of Siri Jodha Khalsa via esip-semanticweb <esip-semanticweb at lists.esipfed.org>
Sent: Friday, January 10, 2020 4:08 PM
To: esip-semanticweb at lists.esipfed.org <esip-semanticweb at lists.esipfed.org>
Subject: [EXTERNAL] Re: [esip-semantictech] NASA GCMD Keywords Version 9.0 Released (2019-11-12)

I'm curious whether the ESIP semantic community has any opinions on these two controlled vocabularies.

One question I have is why a measurement keyword list was necessary when GCMD already has the science keywords (a source for the original SWEET). i.e. why not integrate measurements (which are represented as variables in the science keywords) into the science keywords?

the data format list is even more perplexing to me. "incidence angle file" is a format? Georeferenced TIFF in addition to GeoTIFF?  DV? (digital value?) is a format?  KML as well as OGC KML? ASCII and text (what about unicode?) DEM, if this refers to digital elevation models with a .DEM extension from USGS, are ASCII files.

Many formats are subtypes of other formats listed. Wouldn't a better approach be to list the encodings (a much smaller list, which would tell users how to read the data with software) and then add the conventions that have been applied (e.g. CF for netCDF or GRIB for binary). For the encodings list, why not start with mime types?

sjs

On 11/12/19 5:00 PM, Stevens, Tyler B. (GSFC-423.0)[Stinger Ghaffarian Technologies] via esip-semanticweb wrote:

The NASA Global Change Master Directory (GCMD) staff is pleased to announce the release of the GCMD keywords version 9.0. Version 9.0 consists of two new keyword schemes: (1) Measurement Name and (2) Granule Data Format.

The Measurement Name<https://gcmdservices.gsfc.nasa.gov/kms/concepts/concept_scheme/MeasurementName/?format=csv> list is a preliminary set of (~100) keywords that represent an observable property, usually geophysical, geo-biophysical, physical, or chemical. The Granule Data Format<https://gcmdservices.gsfc.nasa.gov/kms/concepts/concept_scheme/GranuleDataFormat/?format=csv> list of keywords represent the format of the data that is distributed by the data center.

The keywords help facilitate the classification and discovery of Earth Science data by providing a rich vocabulary for characterizing the data. The GCMD keywords are used by hundreds of data providers worldwide for categorizing the ~33,000 records stored in the Common Metadata Repository<http://earthdata.nasa.gov/cmr>.

For more information about the keywords and how to access them, please visit the Keyword Landing Page.<https://earthdata.nasa.gov/about/gcmd/global-change-master-directory-gcmd-keywords> Questions about the keywords can be submitted to support at earthdata.nasa.gov<mailto:support at earthdata.nasa.gov> or directed to Valerie Dixon at valerie.dixon at nasa.gov<mailto:valerie.dixon at nasa.gov>.

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--
Siri-Jodha Singh KHALSA, Ph.D., SMIEEE
National Snow and Ice Data Center
University of Colorado
Boulder, CO 80309-0449 Phone: 1-303-492-1445 GV: 1-303-736-9976
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