[Esip-documentation] cdm_data_type defintion

[Bob Simons - NOAA Federal]

You're talking about featureType, the CF attribute which is
well-defined and widely supported by software, notably by netcdf-java.
I'm talking about cdm_data_type, which is ill-defined and not widely
used by software because of that.

On Thu, Feb 19, 2015 at 12:18 PM, Mike McCann via Esip-documentation
<esip-documentation at lists.esipfed.org> wrote:
> I think ERDDAP may be the only software which actually uses this attribute
> in a very specific, programmatic way...
>
>
> The STOQS software also depends on proper values in the featureType
> attribute (though is sometimes able to infer the appropriate featureType
> from cdm_data_type attribute in legacy data sets).
>
> I concur that "CF might/should expand the use of featureType", and make sure
> the semantics align with other vocabularies.
>
> -Mike
>
> --
> Mike McCann
> Software Engineer
> Monterey Bay Aquarium Research Institute
> 7700 Sandholdt Road
> Moss Landing, CA 95039-9644
> Voice: 831.775.1769  Fax: 831.775.1736 http://www.mbari.org
>
> On Feb 19, 2015, at 10:33 AM, Bob Simons - NOAA Federal via
> Esip-documentation <esip-documentation at lists.esipfed.org> wrote:
>
> I think cdm_data_type is a troubled attribute.
> Unidata has released several different lists of CDM data types over the
> years as CDM progressed. Those all still exist at various URLs on the web
> and in Unidata code (some of it obsolete).
> CF has a new(er), closely related featureType attribute
> http://cfconventions.org/Data/cf-conventions/cf-conventions-1.6/build/cf-conventions.html#idp6280704
> but it is unfortunately just for Discrete Sampling Geometry types.
>
> I think ACDD 1.3 chose to avoid dealing with this in hopes that CF will
> solve the problem. E.g., CF might/should expand the use of featureType.
>
> I think ERDDAP may be the only software which actually uses this attribute
> in a very specific, programmatic way, which is vocabulary which is a combo
> of
> * the values that CF's featureType uses (from just before CF created the
> featureType attribute), e.g., TimeSeries.
> * a few other Unidata CDM types, e.g., Grid
> * "Other"
> http://coastwatch.pfeg.noaa.gov/erddap/download/setupDatasetsXml.html#cdm_data_type
>
> I'm sorry there isn't a better answer.
>
>
> On Thu, Feb 19, 2015 at 9:51 AM, Armstrong, Edward M (398G) via
> Esip-documentation <esip-documentation at lists.esipfed.org> wrote:
>>
>>
>> Hi folks
>>
>> I’ve come across a request for the proper usage of the ACDD attribute
>> cdm_data_type.  This has been retained in  ver 1.3.   But what are the
>> examples of its implementation ? According to:
>>
>>
>> http://www.unidata.ucar.edu/software/thredds/current/tds/catalog/InvCatalogSpec.html#dataType
>>
>> attribute examples could “Grid” ,“Swath”, “Point" etc.  But some popular
>> implementation embedded in existing examples use a lowercase syntax such as
>> “swath”
>>
>> Which is the proper implementation, upper vs lowercase ?  Or perhaps this
>> is still nebulous.  I did find this note from Bob Simmons in our recent ACCD
>> v1.3 discussion on a google doc spreadsheet (but I don’t remember the
>> consensus  on it):
>>
>> cdm_data_type should not be tied to
>>
>> http://www.unidata.ucar.edu/software/thredds/current/tds/catalog/InvCatalogSpec.html#dataType
>> which is out-of-date and obsolete
>>
>> Any insight appreciated.
>>
>> -ed
>>
>> Ed Armstrong
>> JPL Physical Oceanography DAAC
>> 818 519-7607
>>
>>
>>
>>
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>> Esip-documentation at lists.esipfed.org
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>>
>
>
>
> --
> Sincerely,
>
> Bob Simons
> IT Specialist
> Environmental Research Division
> NOAA Southwest Fisheries Science Center
> 99 Pacific St., Suite 255A      (New!)
> Monterey, CA 93940               (New!)
> Phone: (831)333-9878            (New!)
> Fax:   (831)648-8440
> Email: bob.simons at noaa.gov
>
> The contents of this message are mine personally and
> do not necessarily reflect any position of the
> Government or the National Oceanic and Atmospheric Administration.
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-- 
Sincerely,

Bob Simons
IT Specialist
Environmental Research Division
NOAA Southwest Fisheries Science Center
99 Pacific St., Suite 255A      (New!)
Monterey, CA 93940               (New!)
Phone: (831)333-9878            (New!)
Fax:   (831)648-8440
Email: bob.simons at noaa.gov

The contents of this message are mine personally and
do not necessarily reflect any position of the
Government or the National Oceanic and Atmospheric Administration.
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