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 <[email protected]> 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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