Thanks, Roy.
There's something not quite symmetrical in this, either - maybe it's
"just" terminology, maybe not.
A time series is conceptually identical to a profile, just "turned on
its side"
so time is the single incrementing dimension, instead of depth. The
difference
turns out to be important in the proposal mainly because of the way
we'd
aggregate profiles vs time series.
A point, in my lexicon, is an atomic unit, a single measurement at a
single
x,y,z,t. Is there a "single point" in your feature types? Why assign
the term
point to a set of measurements with single x, y, and z and progressing
t, as
opposed to a set of measurements with single x, y, t values but varying
z?
Cheers -
Nan
Lowry, Roy K wrote:
..
The feature terms we use for observational data in BODC are:
Profile - single set of measurements with single (by assumption) x, y, t values but varying spatial z. An example is a single, fully processed (i.e. binned) CTD cast.
Profile collection - an aggregation of profiles into a single data object. An example is all the CTDs from a section or a cruise.
Profile series - a set of measurements with single x,y a fixed set of spatial z values and progessing t. An example is a single moored ADCP deployment record.
Point - a set of measurements with single x, y, and z and progressing t. Example is a single moored recording current meter record.
Point collection - an aggregation of point features in a single container. Example is all the records from all the current meters on a mooring or deployed on a cruise.
Spectrum series - a set of measurements with single x,y a fixed set of non-spatial z values and progessing t. An example is a power spectrum time series from a wave recorder.
2D-trajectory - a set of measurements with variable x, y, t and a single spatial z. Example is the thermosalinograph record from a cruise.
3D-trajectory - set of measurements with variable x, y, t and a single spatial z. Example is the thermosalinograph record from an AUV mission. It is also applicable to a yo-yo CTD station, mirroring Chris's comments on atmospheric "profiles" with variant x,y.
I think that Nan and most of the observational oceanographic community recognise these concepts and consequently, if a mapping to them to your feature definitions is maintained then it will help keep us on board.
Note that the difference between 'point' and 'point collection' is important to me as on observational data manager, which is a different perspective to an observational data ingestor.
Cheers, Roy.
--
*******************************************************
* Nan Galbraith (508) 289-2444 *
* Upper Ocean Processes Group Mail Stop 29 *
* Woods Hole Oceanographic Institution *
* Woods Hole, MA 02543 *
*******************************************************
--
*******************************************************
* Nan Galbraith (508) 289-2444 *
* Upper Ocean Processes Group Mail Stop 29 *
* Woods Hole Oceanographic Institution *
* Woods Hole, MA 02543 *
*******************************************************
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