[CF-metadata] CDM calendar date handling

2011-08-24 Thread Jonathan Gregory
Dear John It seems to me it would be better to somehow denote the epoch seperately, because its kind of silly keeping track of # millisecs between two dates separated by 50 million years. plus its hard. what about: 01-01-01 12:00 epoch 50m BCE where the epoch 50m BCE is probably just

Re: [CF-metadata] CDM calendar date handling

2011-08-24 Thread John Caron
On 8/24/2011 6:23 AM, Jonathan Gregory wrote: Dear John It seems to me it would be better to somehow denote the epoch seperately, because its kind of silly keeping track of # millisecs between two dates separated by 50 million years. plus its hard. what about: 01-01-01 12:00 epoch 50m BCE

Re: [CF-metadata] CDM calendar date handling

2011-08-24 Thread Jim Biard
I've got a question and a thought to stir the pot with. Is there any problem with having negative values for the dates, or are we talking about having only positive and increasing values? It seems that providing a way to specify the base unit of time would be helpful from a conceptual

Re: [CF-metadata] CDM calendar date handling

2011-08-24 Thread Jonathan Gregory
Dear John since im going to propose some grammar that we will be stuck with for the next 50m years ... :-) We've talking about the syntax which describes the reference date now, is that right? That is, the complete syntax is N [calendar] UNITS since DATE and we have so far said that it's not a

Re: [CF-metadata] CDM calendar date handling

2011-08-24 Thread Don Murray
John and Jonathan- On 8/24/11 9:23 AM, Jonathan Gregory wrote: So now we are taking about the N calendar UNITS part, when that part means a large number of years. I think this format: 50 calendar Myears since 1980-01-01 is the best one. The word calendar is useful to make clear it is not

[CF-metadata] standard names for stations

2011-08-24 Thread Jeffrey F. Painter
The draft version 1.6 of the CF Conventions manual recommends use of two standard names which don't exist yet but are needed to describe discrete data such as observations from stations or other discrete points. So I'd like to propose the following two standard names: - station_description :