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Ticket Resolution Summary Owner Reporter
#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

#25 fixed Correction in Conventions document, table 3.1 cf-conventions@… mlaker1
Description

The Conventions document, version 1.1 at http://cf-pcmdi.llnl.gov/documents/cf-conventions/1.1/cf-conventions.html has an error in an entry in the right-hand sub-table of Table 3.1, in section "3.1 Units":

The entry:

1e-2 deci c

should read:

1e-2 centi c

#28 wontfix Correct recommended units for lat and lon cf-conventions@… apamment
Description

Beate Geyer has pointed out that the recommended units for latitude and longitude coordinate variables in sections 4.1 and 4.2 of the conventions document are inconsistent with the canonical units published in the standard name table.

Sections 4.1 and 4.2 of the conventions recommend degrees_north and degrees_east for lat and lon, respectively. The standard name table uses the singular form for the canonical units, i.e. degree_north and degree_east. The two sources of documentation should be made consistent. Beate has indicated a preference for the singular form of the unit, therefore it is proposed that the conventions document should be modified to agree with the standard name table. This requires modification to the sentences in sections 4.1 and 4.2 beginning with "The recommended unit ...".

Alison

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