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From "Martin Desruisseaux (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (SIS-418) Global Change Master Directory (GCMD) keywords in netCDF
Date Mon, 21 May 2018 09:18:00 GMT

     [ https://issues.apache.org/jira/browse/SIS-418?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Martin Desruisseaux updated SIS-418:
------------------------------------
    Summary: Global Change Master Directory (GCMD) keywords in netCDF  (was: Decompose netCDF
keywords attribute value)

> Global Change Master Directory (GCMD) keywords in netCDF
> --------------------------------------------------------
>
>                 Key: SIS-418
>                 URL: https://issues.apache.org/jira/browse/SIS-418
>             Project: Spatial Information Systems
>          Issue Type: Improvement
>          Components: Storage
>    Affects Versions: 0.3, 0.4, 0.5, 0.6, 0.7, 0.8
>            Reporter: Martin Desruisseaux
>            Priority: Major
>
> The {{keywords}} attribute in netCDF files sometime contains a value like below:
> {noformat}
> :keywords = "EARTH SCIENCE > Oceans > Ocean Temperature > Sea Surface Temperature"
;
> :keywords_vocabulary = "GCMD Science Keywords" ;
> {noformat}
> Currently, {{NetcdfMetadata}} store the whole string in a single ISO 19115 {{Keyword}}
value, while actually it should be many keywords. The GCMD keywords structure is described
on the NASA [Global Change Master Directory (GCMD) Keywords|https://earthdata.nasa.gov/about/gcmd/global-change-master-directory-gcmd-keywords]
web page. It uses the following hierarchical structure:
> {quote}Category > Topic > Term > Variable > Detailed Variable{quote}
> We may interpret the structure as below:
> * We support only {{"EARTH_SCIENCE"}} (other possible values are {{"CONTINENT"}}, {{"Earth
Remote Sensing Instruments"}}, _etc._)
> * {{KeywordType.DISCIPLINE}} (note: would be wrong if above was {{"CONTINENT"}} for example).
> * {{KeywordType.THEME}} (note: would be {{KeywordType.INSTRUMENT}} instead if above was
_"Earth Remote Sensing Instruments"_ instead than _"Earth Science"_).
> * {{KeywordType.SUB_TOPIC_CATEGORY}}
> We may also provide a {{KeywordClass}} with a reference to GCMD as an ontology.



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