Dear John

>    DateTime (ISO8601), Elapsed Mission Time (seconds), Sensor Time  
> (ISO8601), Sensor Date (ISO8601), Day-of-Year
> Data Record:
>    2008-08-18T18:57:55.79, 8403.33, 12:12:11,2008-08-18,262
...

Could the third and fourth fields (sensor date and time) be combined and
encoded as a single time-since-ref variable? We could give it a new standard
name e.g. sensor_time. I'd prefer that to adopting ISO8601 as a completely
different way of encoding time in CF.

> The fifth field is at least a 'days since' format, though the  
> reference point will have discontinuities every new year. I'm a little  
> at sea as to whether this can be called 'time' or not.

Yes, I think it would be a time - but what is it? Is just repeating the
sensor date, in effect?

Cheers

Jonathan
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