[CF-metadata] How to handle a forecast model with non-monotonic coordinate variables

From: Jonathan Gregory <j.m.gregory>
Date: Fri, 28 Feb 2014 18:28:06 +0000

Dear John

> "Missing data are permitted in an auxiliary coordinate variable only at points where all the referencing variables also have missing data." Trying to fix some nits and make it a bit more parseable.

I think that is OK. In case it is not clear what "referencing variables" means
it could be "all the data variables which refer to it".

However, now I look again at ticket 85, which has been agreed already, and Rich
drew our attention to it, I wonder whether we can't just go with that.

"Missing data is allowed in data variables and auxiliary coordinate
variables. Generic applications should treat the data as missing where any
auxiliary coordinate variables have missing values; special-purpose
applications might be able to make use of the data. Missing data is not
allowed in coordinate variables."

I guess we must have been through a similar discussion before. The above is
more permissive than the words you suggest. It says it's allowed to have
missing data in aux coord vars, but if you do that at any points where the
data variable is non-missing, the data values there should be ignored i.e.
treated as if they were missing.

Is that all right?

Best wishes

Jonathan
Received on Fri Feb 28 2014 - 11:28:06 GMT