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#118: Add an attribute in Appendix F to identify the geoid
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Reporter: jonathan | Owner: cf-conventions@…
Type: enhancement | Status: new
Priority: medium | Milestone:
Component: cf-conventions | Version:
Resolution: | Keywords:
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Comment (by jonathan):
Dear Mark
I am not proposing anything different from what has already been decided
in ticket 69. It is permitted to put any valid WKT in the `crs_wkt`
attribute. CF doesn't standardise WKT, of course, and CF generic
applications can't be expected to analyse WKT. You are much more familiar
with WKT strings than I am, so I expect you have got examples!
The new attribute for `grid_mapping` that I am proposing is of exactly the
same kind of those which have been agreed in ticket 80, to supplement
those which we already have in App F. It is an attribute in which you can
store the geoid name, that's all. I believe that the geoid name may be the
string at the start of a VERT_DATUM clause in WKT if the vertical datum is
a geoid, but as I say, I am no expert on WKT. Hence my question, is "North
American Vertical Datum 1988" the name of a geoid? Does anyone know?
However, I don't think that the answer to that affects the proposal. Where
the geoid name is recorded in WKT is not the issue in this proposal. The
proposal is about an attribute in `grid_mapping` which is specifically
intended to record the geoid name. If `crs_wkt` is provided as well,
presumably the geoid name might be in there as well, and we can only hope
they will be consistent. That is the same situation as for all the other
attributes, and is what we decided to do in ticket 69 and 80. I don't
think we should reopen that discussion, which took a long time and a lot
of thought by several people.
Best wishes
Jonathan
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Ticket URL: <http://cf-pcmdi.llnl.gov/trac/ticket/118#comment:7>
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