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Ticket Resolution Summary Owner Reporter
#26 fixed Enhance CF flag definitions to support bit fields russ gregr

1. Title

Bit field enhancement to CF Flags definition

2. Moderator


3. Requirement

CF ought to provide a flag expression for multiple conditions, typically Boolean (binary), that describes one or more status conditions associated with a data variable.

4. Initial Statement of Technical Proposal

A new CF flag attribute, named "flag_masks", would enhance the current CF flags capabilities to describe multiple, independent status conditions using bit fields to define unique conditions or status codes.

5. Benefits

Bit field flag attributes are best suited for describing data variables possessing a number of status conditions that typically occur independently of each other.

Bit field attributes would simplify the description of status flags that don't conveniently map to a unique set of mutually exclusive status codes, currently defined with flag_values attributes.

For example, when describing a precipitation measurement within a particular geo-spatial grid, a bit field flag value may be defined to contain four possible binary status conditions, occupying the four least significant bits, whose values would be defined as follows: 1 to indicate no sensor coverage at the grid location, 2 to indicate observation impairment at that grid location, 4 to indicate mixed-phase precipitation at the grid location, 8 to indicate snow precipitation at the grid location.

6. Status Quo

Current flag values could be defined for every OR'ed combination of bit settings that define all possible status conditions, but the result would be inefficient compared to simple bit field definitions.

#1 fixed Convert CF Conventions to DocBook XML halliday1 halliday1
  • Convert CF Conventions 1.0 and CF Standard Name Table to DocBook? XML.
  • Create scripts to automatically generate PDF, HTML, and chunked HTML output from DocBook?, and make it simple to update the website with new document revisions.
  • Add the baseline documents and build scripts to the CF Subversion repository.
#2 fixed Setup for CF Subcommittees halliday1 halliday1
  • Create mailing list and Trac component for each CF subcommittee.
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