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Ticket Resolution Summary Owner Reporter
#75 fixed fix documentation and definitions of 3 grid mapping definitions davidhassell etourigny
Description

The definitions and/or documentation for 3 grid mappings cause confusion and inconsistency when translating to/from WKT.

This ticket is the result of a discussion in the mailing list: http://mailman.cgd.ucar.edu/pipermail/cf-metadata/2011/027605.html .

Here is a summary of suggested changes:

1) lambert_conformal_conic

The 1SP (1 standard_parallel) case is not properly documented. There should be a link to http://www.remotesensing.org/geotiff/proj_list/lambert_conic_conformal_1sp.html and mention that latitude_of_projection_origin==standard_parallel (and the WKT "Scale factor at natural origin" = 1).

In the case that scale_factor is not 1, then the 2SP version should be used (as scale_factor is not part of this projection's parameters in CF).

Also, the EPSG codes should included in "Notes" (9801 for 1SP and 9802 for 2SP).

2) lambert_cylindrical_equal_area

The scale_factor_at_projection_origin variant has no WKT nor PROJ.4 equivalent (they both require standard_parallel) and there are no known examples using this variant. It should be dropped from the CF spec, or at least deprecated.

3) polar_stereographic

The 2 variants (standard_parallel or scale_factor_at_projection_origin) are not well documented.

The standard_parallel variant corresponds to EPSG Polar Stereographic (Variant B) (EPSG dataset coordinate operation method code 9829), while the scale_factor_at_projection_origin variant corresponds to EPSG Polar Stereographic (Variant A) (EPSG dataset coordinate operation method code 9810).

This information should be included in the "Map parameters" and "Notes" sections, to be consistent with other definitions such as mercator.

#47 fixed error in example 7.4 cf-conventions@… eaton
Description

Example 7.4 in the conventions doc has an unlimited time dimension which must be listed as the first dimension in C ordering. The variables pressure, maxtemp, and ppn all have dimensions (station,time). All three should be modified to read (time,station).

#35 fixed delete "associated" in CF standard, chapter 5, introduction, paragraph 3 cf-conventions@… jonathan
Description

This was raised by John Caron, and Brian Eaton and Jonathan Gregory agree.

Change

We recommend that the name of a multidimensional coordinate variable should not match the name of any of its dimensions because that precludes supplying an associated coordinate variable for the dimension.

to

We recommend that the name of a multidimensional coordinate variable should

not match the name of any of its dimensions because that precludes supplying a coordinate variable for the dimension.

i.e. delete "associated", which has a technical meaning in the CF standard that is not meant here.

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