[CF-metadata] Best representation of wire-crawling profiler

Signell, Richard rsignell at usgs.gov
Tue Feb 28 12:18:54 MST 2017


CF Folks,

Okay, with help from the ERDDAP community
https://groups.google.com/forum/#!topic/erddap/xfAufA8Qyhg
I think I figured this out:

The solution would be to use nominal "time(profiles)" and
"precise_time(obs)".   So we would write something like

https://data.ioos.us/gliders//thredds/dodsC/deployments/rutgers/unit_191-
20150105T1443/unit_191-20150105T1443.nc3.nc.html

with both "time" and "precise_time", but instead of using the
multidimensional representation, use the ragged representation, like this

http://cfconventions.org/cf-conventions/cf-conventions.html#_ragged_array_
representation_of_time_series_profiles

So in addition to "precise_time(obs)" we would also have data variables
like "temperature(obs)".

Thanks,
Rich

On Tue, Feb 28, 2017 at 7:27 AM, Signell, Richard <rsignell at usgs.gov> wrote:

> CF Folks,
>
> What would be the best DSG featureType to represent a wire-crawling
> sensor that has a fixed lon,lat location, but non-uniform depth
> interval as it goes up and down, and takes enough time that the
> profile might not be accurately represented with a single time value?
>
> On this ERDDAP site the featureType is "trajectory":
> http://ooi-data.marine.rutgers.edu/erddap/info/
> CP04OSPM-WFP01-04-FLORTK000-flort_kn_stc_imodem_
> instrument-telemetered-d0005/index.html
>
> and I'm wondering if that's the best, or whether "timeSeriesProfile"
> would be better, written as as ragged array with profile_index?
>
> Certainly if we assigned a "nominal time" for each cast, then it would
> clearly be representable as timeSeriesProfile, but it's not clear to
> me that it meets the CF conventions if time varies within the cast.
>
> There would be value in allowing the time-varying values within the
> profile, but also labeling/indexing the profiles,  so that people
> could easily extract, say, all the "down" profiles, excluding the "up"
> (or vice versa).
>
> Thanks,
> Rich
>
> --
> Dr. Richard P. Signell   (508) 457-2229
> USGS, 384 Woods Hole Rd.
> Woods Hole, MA 02543-1598
>



-- 
Dr. Richard P. Signell   (508) 457-2229
USGS, 384 Woods Hole Rd.
Woods Hole, MA 02543-1598
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