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Ticket Resolution Summary Owner Reporter
#74 fixed Allow sharing of ancillary variables among multiple data variables davidhassell rhorne@…
Description

Currently it is not possible for multiple data variables to share an ancillary variable.

Augment the conventions to allow two or more data variables to share an ancillary variable.

Here is an example of a convention, which dovetails with the existing conventions, to provide this capability:

float swpt(lat,lon);

. .

swpt:standard_name="sea_water_potential_temperature"; swpt:ancillary_variables="nobs flags"; . .

float sws(lat,lon);

. . sws:standard_name="sea_water_salinity"; sws:ancillary_variables="nobs flags"; . .

int nobs(lat,lon);

. . nobs:standard_name="sea_water_potential_temperature sea_water_salinity number_of_observations"; . .

int flags(lat,lon);

. . flags:standard_name="sea_water_potential_temperature sea_water_salinity status_flag"; flags:flag_values = 0, 1, 2; flags:flag_meanings = "valid invalid unknown"; . .

Change the text in the CF metadata conventions section 3.3 that reads

"A standard name is associated with a variable via the attribute standard_name which takes a string value comprised of a standard name optionally followed by one or more blanks and a standard name modifier (a string value from Appendix C, Standard Name Modifiers)."

to

"A standard name is associated with a variable via the attribute standard_name which takes a string value that can have either of two forms. The first form is a standard name alone. The second form is a blank-separated list beginning with one or more standard names and ending with a single standard name modifier (i.e. standard_name [standard_name ...] standard_name_modifier). The standard name modifiers are defined in Appendix C, Standard Name Modifiers. This second form permits a single variable to provide ancillary data (see section 3.4) for two or more variables where each has a unique standard name."

Changes to CF software tools are required. For example, the CF_checker, which validates the standard_name attribute needs to change. However, it does not require any change to software that uses the complete attribute simply as an identifying string (e.g. to label plots, etc.)

#86 fixed Allow coordinate variables to be scaled integers davidhassell rhorne@…
Description

Currently, a coordinate variable that makes use of the standard NetCDF scaled integer convention is not CF metadata compliant.

In addition to the reduction in NetCDF dataset (file) size, there are other advantaged to allowing it including simplifying product formatting software, and having an attribute (scale_factor) that provides insight into the spatial resolution of the data variable.

To update the CF metadata conventions standard document requires changing a two rows in Table A.1 Attributes in Appendix A.

(1) In the "add_offset" row, the "Use" column needs to change from "D" to "C, D"

(2) In the "scale_factor" row, the "Use" column needs to change from "D" to "C, D"

#102 fixed Request for two additional cell_methods davidhassell rhorne@…
Description

The GOES-R ground system generates products that conmtains two statistics that are not defined in the current set of cell methods in the CF standard. The two statistics are:

(1) root_mean_square (2) total_sum_of_squares

This trac item requests that these two statistics be added to the set of CF defined cell_methods. The changes to the CF standard required to support this are as follows...

In CF standard paragraph 7.3. Cell Methods, change this sentence:

The values of method should be selected from the list in Appendix E, Cell Methods, which includes point, sum, mean, maximum, minimum, mid_range, standard_deviation, variance, mode, and median.

To:

The values of method should be selected from the list in Appendix E, Cell Methods, which includes point, sum, mean, maximum, minimum, mid_range, standard_deviation, variance, mode, median, root_mean_square, and total_sum_of_squares.

In CF standard Appendix E Cell Methods, add the following two rows to Table E.1 Cell Methods:

(first new row)

cell_methods column: root_mean_square

Units column u

Description column: Root mean square (RMS)

(second new row)

cell_methods column: total_sum_of_squares

Units column u2

Description column: Total sum of squares (TSS)

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