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Ticket Resolution Summary Owner Reporter
#58 fixed Remove deprecation of "missing_value" attribute cf-conventions@… caron
Description

CF incorrectly deprecates the "missing_value" attribute due to a misunderstanding.

All changes refer to section 2.5.1:

  1. Change the first paragraph from:

"The NUG conventions (NUG section 8.1) provide the _FillValue, valid_min, valid_max, and valid_range attributes to indicate missing data."

to:

"The NUG conventions (NUG section 8.1) provide the _FillValue, missing_value, valid_min, valid_max, and valid_range attributes to indicate missing data."

  1. remove the word "strongly" from this sentence:

"If only one missing value is needed for a variable then we strongly recommend that this value be specified using the _FillValue attribute."

  1. Remove this paragraph:

"The missing_value attribute is considered deprecated by the NUG and we do not recommend its use. However for backwards compatibility with COARDS this standard continues to recognize the use of the missing_value attribute to indicate undefined or missing data."

  1. Change the first sentence of the last paragraph from:

"The missing values of a variable with scale_factor and/or add_offset attributes (see section Section 8.1, “Packed Data”) are interpreted relative to the variable's external values, i.e., the values stored in the netCDF file. "

to:

"The missing values of a variable with scale_factor and/or add_offset attributes (see section Section 8.1, “Packed Data”) are interpreted relative to the variable's external values ( a.k.a. the packed values, the raw values, the values stored in the netCDF file), not the values that result after the scale and offset is applied."

#60 invalid CF Checker Version 2.0.1 cf-checker@… ros
Description

Holding ticket to detail changes/fixes made to the CF Checker for version 2.0.1

#61 fixed 2 new cell methods cf-conventions@… awalsh
Description

1. Title

2 new cell methods

2. Moderator

Moderator - Alison Pammet Proposer - Andrew Walsh. Contributors and discussion - Jonathon Gregory, Roy Lowry, Mark Kulmar

3. Requirement

Extend the cell methods table with 2 new cell methods.

4. Initial Statement of Technical Proposal

As a result of discussion around the adding 9 new sea surface wave data

parameters to the CF standard names list it was decided to reduce this proposal to 6 new standard names thereby reducing the proliferation of new names. This reduction was achieved by introducing a 'common concept' name called 'sea_surface_wave_height' qualified by one of 4 cell methods i.e.

mean maximum root_mean_square mean_of_upper_decile

which will describe 4 of the statistical wave height variables:

sea_surface_mean_wave_height sea_surface_maximum_wave_height sea_surface_root_mean_square_wave_height sea_surface_wave_mean_of_highest_one_tenth_waves

respectively.

'mean' and 'maximum' are existing cell methods. 'root_mean_square' and 'mean_of_upper_decile' are the 2 new cell methods proposed.

The other 5 new standard names proposed were:

sea_surface_wave_mean_crest_period sea_surface_wave_significant_wave_period sea_surface_wave_period_at_second_largest_peak_of_variance_spectral_density sea_surface_wave_variance_spectral_density_zeroth_frequency_moment sea_surface_wave_root_mean_square_amplitude_from_variance_spectral_density

5. Benefits

This proposal would benefit the netCDF user community as it reduces the proliferation of new names by using a common concept standard name qualified by cell methods. These 2 new cell methods may also find useful application with

other data parameters wherever statistical methods of 'root_mean_square' or 'mean_of_upper_decile' were applied.

6. Status Quo

Status quo would be to use non-standard long_names for these sea surface wave data variables with the disadvantage of poor interoperability.

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