Martin Desruisseaux created SIS-418:
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Summary: Decompose netCDF keywords attribute value
Key: SIS-418
URL: https://issues.apache.org/jira/browse/SIS-418
Project: Spatial Information Systems
Issue Type: Improvement
Components: Storage
Affects Versions: 0.8, 0.7, 0.6, 0.5, 0.4, 0.3
Reporter: Martin Desruisseaux
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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