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Ticket Resolution Summary Owner Reporter
#119 invalid test new Trac site cf-conventions@… painter1
Description

I'm testing the new Trac site: cf-trac.llnl.gov/trac

#118 fixed Add an attribute in Appendix F to identify the geoid or other geopotential datum davidhassell jonathan
Description

Some geophysical quantities, including some vertical coordinates, are defined with reference to the geoid. For example, the standard_name of altitude is the height above the geoid. CF does not have a default geoid, because the convention is used for both model-generated and real-world data, and climate models typically do not use a real-world geoid. When CF is used for real-world data, it may be necessary to desirable to specify which geoid is being used.

This proposal is to define a new attribute geoid_name to be included in the table of Appendix F for the legal attributes of the grid_mapping variable. This attribute will have type S (string) and its description will be "The name of the geoid. Corresponds to an OGC WKT VERT_DATUM name."

Ticket 80, which was agreed a long time ago for inclusion in CF 1.7, also adds some attributes to Appendix F. This proposal is complementary to and consistent with that one.

Jonathan Gregory

#114 invalid CF checker incorrectly complains about scale_factor of same type as variable. cf-checker@… biard
Description

When running the CF checker on a file with a variable of type double which has a scale_factor of type double, I get the complaint

"must be of type byte, short or int"

When you use a scale_factor, that unpacks to double, you need the data in the variable to be type byte short or int. See: "Section 8.1 - Packed Data"

Yet Section 3.1 states:

The Udunits syntax that allows scale factors and offsets to be applied to a unit is not supported by this standard. The application of any scale factors or offsets to data should be indicated by the scale_factor and add_offset attributes.

This is, in fact what is being done in file in question.

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