[thredds] How do ncss/wcs/wms deal with multiple time axis from large FCs?

• To: THREDDS community <thredds@xxxxxxxxxxxxxxxx>
• Subject: [thredds] How do ncss/wcs/wms deal with multiple time axis from large FCs?
• From: Dan Swank - NOAA Affiliate <dan.swank@xxxxxxxx>
• Date: Mon, 22 Jun 2015 17:08:44 -0400

This is in regards to the latest THREDDS 4.6.2

Some of our GRIB datasets from NCEI-NOMADS, when
placed into huge TwoD featureCollections, present me with
many time axis:  I've seen on the order of refTime15, time15, etc.
Resulting (I suspect) from non-homogeneities from dataset changes over time
(years) that cannot easily be dealt with.

ncss and wcs/wms services supposedly work with GRIB featureCollections,
I've seen various results.   In daily directory pratitions, which are
almost always
homogenous, these services generally work well.   If you try them on
the top level feature collections (spanning years)  you get a flood of
different time axis, mentioned above.

My main question is... if ncss / wcs / wms is
used on these multi-year aggregations, how do/can
 these services select and use only one from the
various time axis presented on the OpenDap form?

In some cases, our ncss on Full Collection top level, will
outright fail, printing nothing more then a text string, like this:


gribFC/srrsGrib1fc/TwoD/LatLon_181X360-p5N-180p0E/dataset.html

and terminate,  leaving no ncss form.


John Caron has claimed ot not be able to replicate this.
And I have not been very successful in isolating what conditions
   cause it to happen.   But it certainly does.


Dan Swank
NOMADS System Support, STG Inc. - Federal Government Contractor
NOAA's National Centers for Environmental Information (NCEI)
Data Stewardship Devision (DSD)
151 Patton Ave
Asheville, NC 28801
dan.swank@xxxxxxxx
Phone: 828-271-4007
Customer Support:  828-271-4800 or http://www.ncdc.noaa.gov/contact

The newly formed NCEI merges the National Climatic Data Center (NCDC), the
National Geophysical Data Center (NGDC), and the National Oceanographic
Data Center (NODC).

Facebook: http://www.facebook.com/NOAANationalClimaticDataCenter Twitter:
@NOAANCDC @NOAAOceanData

======================= Disclaimer ===========
I am not a Federal Employee.
Any opinions expressed in this message are mine personally and
do not represent official positions from STG Inc, ERT, NCEI, or NOAA
============================================

• Follow-Ups:
  • Re: [thredds] How do ncss/wcs/wms deal with multiple time axis from large FCs?
    • From: Christian Ward-Garrison