Hi All
I am considering data formats for an ESA Sentinel satellite ground
processor. It will be based on netCDF-CF files packaged within SAFE , a
common format for archiving to ensure long-term preservation of EO data
holdings (earth.esa.int/SAFE). I would like to be able to include SAFE
attributes within the netCDF-CF in order to simplify packaging.
I came across CF-Metadata Trac ticket #27 : "Using namespace tags to
include other conventions..." which discussed using the Conventions
attribute to declare an association between a prefix and namespace or
using a 'namespace' attribute. Several alternative syntax were proposed.
For instance,
Conventions = "CF-1.4";
namespaces ="safe=
http://earth.esa.int/SAFE/<S3_schema>/"
or
Conventions = "CF-1.4, safe=
http://earth.esa.int/SAFE/<s3_schema>/"
In addition, there was discussion regarding the necessity of not of
escaping the additional colon in the use of the namespace prefix e.g.
var:safe\:attrib = "value" ;
or
var:safe:attrib = "value" ;
This use of namespaces would enable middleware to ingest netCDF-CF files
and easily extract the mandatory SAFE attributes from the headers.
Ticket #27 is a year old and I have found no more recent discussion
regarding this proposal. Overloading the Conventions attribute to
declare additional namespaces is fine (as was discussed in the Trac
ticket). However, the usage of the prefix in netCDF files was undecided.
I would be grateful for guidance regarding the recommended use of
namespaces with respect to CF Conventions.
Kind Regards
Steve
------------------------------------------------------------------------
-------------------------
Dr Stephen Emsley
ARGANS Limited
Tel: +44 (0)1752 764 289
Unit 3 Drake Building
Mobile: +44 (0)7912 515 418
Tamar Science Park
Fax: +44 (0)1752 772 227
Derriford, Plymouth, PL6 8BY
SEmsley at argans.co.uk <mailto:SEmsley at argans.co.uk>
Skype(tm): archonsme
------------------------------------------------------------------------
--------------------------
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <
http://mailman.cgd.ucar.edu/pipermail/cf-metadata/attachments/20090723/8d984f6e/attachment-0002.html>
Received on Thu Jul 23 2009 - 02:55:01 BST
