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Hi Tim,It may be I havn't understand well your question, but for the netcdf-c library you van specify special attributes, that are been used to specify the ourput format.
For example, in CDL, you can specify a global attribute :_Format = "netCDF-4" ; to the output as netCDF-4, or the the netCDF-4 classic format as: :_Format = "netCDF-4 classic model" ;if you add that special attribute to the CDL, the ncgen will generate it in the specify format without using the -k option
$ ncgen -o file.nc file.cdlEquivalent special attributes exists for chunking, deflating, shufling andendianess
short z(time, number, level, latitude, longitude) ;
z:scale_factor = 4.97891138815559 ;
z:add_offset = 161839.010544306 ;
z:_FillValue = -32767s ;
z:missing_value = -32767s ;
z:units = "m**2 s**-2" ;
z:long_name = "Geopotential" ;
z:standard_name = "geopotential" ;
z:_Storage = "chunked" ;
z:_ChunkSizes = 1, 1, 2, 144, 144 ;
z:_DeflateLevel = 9 ;
z:_Endianness = "little" ;
The NcML would be similar but, as in the CDL case, it depends if the
library/package/tool been used it's aware about those special attributes.
Hope this help in some way. Antonio S. Cofiño On 19/07/17 08:51, Timothy Patterson wrote:
NcML and CDL are able to provide a human readable description of a particular instance of a product but are not designed to describe a more generic product format specification. The format specification would need to handle elements with values only known at runtime (dimensions, scaling and offset attributes, etc.), the NetCDF model used, the underlying storage layer, aspects of chunking and compression, etc. Basically everything you'd want to be able to construct NetCDF product instances. Having looked at a number of NetCDF format description documents, there doesn't seem to be a standard way of describing a NetCDF format specification. In general, the specification authors resort to either breaking the format into a tabulated description or using a modified/annotated NcML or CDL. Is there a preferred or standard way of describing NetCDF formats or has anybody looked at developing something like a standard XML product specification to do this? Best regards, Tim Patterson _________________________________________________________________________________________ Dr. Tim Patterson Instrument Data Simulation Expert Product Engineering/Test Data Coordination MTG Programme GEO Division EUMETSAT Eumetsat-Allee 1 64295 Darmstadt Germany Tel: +49 6151 807 487 Fax: +49 6151 807 7 E-mail: timothy.patterson@xxxxxxxxxxxx Web: www.eumetsat.int Any email message from EUMETSAT is sent in good faith but shall neither be binding nor construed as constituting a commitment by EUMETSAT, except where provided for in a written agreement or contract or if explicitly stated in the email. Please note that any views or opinions presented in this email are solely those of the sender and do not necessarily represent those of EUMETSAT. This message and any attachments are intended for the sole use of the addressee(s) and may contain confidential and privileged information. Any unauthorised use, disclosure, dissemination or distribution (in whole or in part) of its contents is not permitted. If you received this message in error, please notify the sender and delete it from your system. _______________________________________________ NOTE: All exchanges posted to Unidata maintained email lists are recorded in the Unidata inquiry tracking system and made publicly available through the web. Users who post to any of the lists we maintain are reminded to remove any personal information that they do not want to be made public. netcdfgroup mailing list netcdfgroup@xxxxxxxxxxxxxxxx For list information or to unsubscribe, visit: http://www.unidata.ucar.edu/mailing_lists/
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