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.. UHDAS/CODAS restructured text document
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CODAS data conventions
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1. All times are in UTC
2. The **decimal day** is a zero-based value.  Noon January 1 UTC is 0.5, not 1.5.
   This is the best convention when dealing with data that may cross over
   a year boundary.  (if your cruise does cross over a year boundary, the
   decimal days will just keep increasing past the end of the year)
3. Data averaged over a period of time have an associated time and position.
   The CODAS values for time and position are those at the **end**
   of the ensemble.  Other scalars associated with a given ensemble
   (temperature, heading) are averaged.
4. Pitch and roll (if available) are recorded but not used in the
   data processing.