Re: [CF-metadata] Standardized Region Names

2015-04-24 Thread Lowry, Roy K.
Hi Ros and Alison, The standardised region names are held in the NERC Vocabulary server. An RDF-XML version may be obtained using: http://vocab.nerc.ac.uk/collection/P30/current/accepted You can also use this to check the validity of a particular area name, For example to verify 'antarctica' s

Re: [CF-metadata] CF region_names

2015-04-24 Thread Schultz, Martin
Dear all, what is this thing about region_names? I only now saw this popping up and must say that I strongly object to adopt these as a standard. Region definitions are so manifold and depend very much on individual applications that I don't see any value in adopting one set of names (here

Re: [CF-metadata] How to define time coordinate in GPS?

2015-04-24 Thread Manning, Evan M (398B)
It's probably overkill but for Suomi NPP CrIS and ATMS we are planning to provide timestamps for each obs in both TAI and UTC. TAI is the true time dimension, but UTC gives users a correct UTC if that's what they want and should minimize the temptation for them to do TAI to UTC conversions usin

Re: [CF-metadata] CF region_names

2015-04-24 Thread Jim Biard
Martin, I tend to agree with you. We have enough on our plates trying to deal with standard names. The same goes with area types. I am assisting a group that has > 200 of them. Are we really going to expand area types that broadly? And when the next group has 100 slightly different types, what the

[CF-metadata] CF region_names

2015-04-24 Thread Jonathan Gregory
Dear Martin We added the regions to CF a long time ago and they are in use, for example, in CMIP data. As Alison says, CF section 6.1.1 describes them. One reason to need them is that they are *not* precise. Other definitions might relate to the real-world geography precisely, but we need region n

Re: [CF-metadata] How to define time coordinate in GPS?

2015-04-24 Thread Julien Demaria
Hi, Thanks a lot for all your accurate answers! With all these information, for the moment we think the best way to represent our time in CF is to convert the time stamp of the units attribute from GPS to UTC. We cannot change it for the GPS beginning 1980-01-06 so we must transform the 2000-0

[CF-metadata] How to define time coordinate in GPS?

2015-04-24 Thread Jonathan Gregory
Dear all Thanks for these interesting contributions. In CF terms, it seems that UTC and GPS time are different calendars, because of the leap seconds in UTC. A given YMDhms date-time will sometimes be a different number of time-units since reference-time in the two calendars. We ought to clarify t

Re: [CF-metadata] How to define time coordinate in GPS?

2015-04-24 Thread Jim Biard
Julien, The units attribute cannot have "UTC" in it. UTC is implied. Other than that, it looks great! Jim On 4/24/15 12:14 PM, Julien Demaria wrote: Hi, Thanks a lot for all your accurate answers! With all these information, for the moment we think the best way to represent our time in C

Re: [CF-metadata] How to define time coordinate in GPS?

2015-04-24 Thread Jim Biard
Jonathan, I think the answer depends rather heavily on the way people obtained their elapsed times that they stored in their time variables. If they started with time stamps and the conversion to and from elapsed times was done with software that doesn't consider leap seconds, then the recove

Re: [CF-metadata] How to define time coordinate in GPS?

2015-04-24 Thread Seth McGinnis
Jim-- Your suggestion in the last paragraph won't work. UTC is only meaningfully defined for the real world, so the epoch timestamp in the units attribute can only be UTC if the calendar is Gregorian... I'm a bit confused by the way you talk about elapsed times. It seems to me that elapsed time