add example to 5.7 for multi-time dimension data
|Reported by:||graybeal||Owned by:||cf-conventions@…|
In his post http://mailman.cgd.ucar.edu/pipermail/cf-metadata/2006/001008.html, Jonathan thoroughly summarizes possible scenarios that require multiple time axes in a CF file (for example, for handling both forecast (valid) times, and the run time of the forecast.
He concludes with the proposal to add an example as described below.
From a look at section 5.7, it doesn't appear the example has been added. This ticket proposes adding it.
Reference also ticket #104, though I don't believe the changes resulting from that ticket affect this one.
I think what we need to do is add an example of structure (b), and here is one (an instance of case v) from the earlier discussion.
20030101 12:00 analysis (at 00hr) and 12hr,36hr forecasts 20030101 00:00 analysis 6hr,12hr,18hr,24hr forecasts 20030101 06:00 analysis 6hr,18hr forecasts
could be expressed as follows (ordering the time samples as they are above)
time1:standard_name = "forecast_reference_time" ; time1:units = "hours since 2003-01-01 00:00" ;
time2:standard_name = "time" ; time2:units = "hours since 2003-01-01 00:00" ;
temp:long_name = "Air temperature on model levels" ; temp:standard_name = "air_temperature" ; temp:units = "K" ; temp:coordinates = "valtime reftime"
reftime = 12., 12., 12., 0., 0., 0., 0., 6., 6. ; valtime = 12., 24., 48., 6., 12., 18., 24., 12., 24. ;