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Ticket Resolution Summary Owner Reporter
#141 fixed Amend affiliation of one of the original authors cf-conventions@… jonathan
Description

Jonathan Gregory's affiliation is given as "Hadley Centre, UK Met Office". To bring this up to date, it should be changed to "University of Reading and UK Met Office Hadley Centre." This change does not materially affect the CF convention!

#42 fixed Amendments to CF Conformance document cf-conventions@… ros
Description

Whilst updating the checker I came across a couple of omissions in the conformance document. I propose the follow additions, which are implied in the convention but not explicitly stated in the conformance document.

3.5 Flags
Requirements:

 * If the flag_values attribute is present then the flag_meanings attribute must be specified.

 * The type of the flag_meanings attribute is a string whose value is a
blank separated list of words or phrases (words connected by underscores).
#23 fixed Amendments to CF Conventions documents cf-conventions@… ros
Description

Whilst correcting some bugs in the CF checker I came across some errors/omissions in the CF Conventions document and Conformance Document. I propose the following changes.

2.5.1 Missing Data
The table in Appendix A incorrectly states that missing_value and _FillValue are Numeric attributes. This is inconsistent with CF 2.5.1, which says, "The scalar attribute with the name _FillValue and of the same type as its variable is recognized by the netCDF library as the value used to pre-fill disk space allocated to the variable."

The correction required is:

In Appendix A change the type from N to D for missing_value and _FillValue in the table.

3.3 Standard Name Modifiers
The requirements and recommendations for standard name modifiers are missing from the Conformance document.

Change Section 3.3 to

3.3 Standard Name
Requirements:
 * The standard_name attribute takes a string value comprised of a standard
   name optionally followed by one or more blanks and a standard name
   modifier.
 * The legal values for the standard name are contained in the standard name
   table. 
 * The legal values for the standard name modifier are contained in Appendix C,
   Standard Name Modifiers.

5.6 Grid Mappings and Projections
The requirements and recommendations for grid mappings are missing from the Conformance document.

Add a section

5.6 Grid Mappings and Projections

Requirements:
 * The type of the grid_mapping attribute is a string whose value is a single
   variable name.
 * The specified variable name (known as a grid mapping variable) must exist
   in the file.
 * The grid mapping variable must have the grid_mapping_name attribute. The 
   legal values for the grid_mapping_name attribute are contained in
   Appendix F.
 
Recommendations:
 * The grid mapping variable should have 0 dimensions.

Rosalyn

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