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[THREDDS #XGC-910742]: NetCDF Subset Service (NCSS) returns 0.0 vertical coordinate if multiple variables requested

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  • Subject: [THREDDS #XGC-910742]: NetCDF Subset Service (NCSS) returns 0.0 vertical coordinate if multiple variables requested
  • Date: Mon, 11 Jul 2011 12:37:20 -0600
Hi John,

Thanks for this bug report. I've entered it in our issue tracking system here

https://www.unidata.ucar.edu/jira/browse/TDS-192

You can keep an eye on the issue or just check the change logs of new releases.

Ethan

> Hi TDS Folks,
> I've discovered when using NetCDF Subset Service (NCSS) for retrieving data
> values at a point that the vertical coordinate that gets returned
> (vertCoord) is always listed as 0.0 if I request data for more than one
> variable (e.g. var=u,v) regardless of the vertical coordinate that I've
> specified. The data values that are returned are correct for the vertical
> coordinate that I specify, so that's good. It's just that the vertical
> coordinate doesn't come back the same as what I requested. For example:
> 
> GOOD:
> Requesting a single variable (water_temp) at a given depth (10 m) returns
> expected vertCoord (10.0):
> 
> http://oos.soest.hawaii.edu/thredds/ncss/grid/pacioos/ncom/hawaii/NCOM_Hawaii_Regional_Ocean_Model_best.ncd?var=water_temp&latitude=21&longitude=-158&time_start=2011-04-10T00%3A00%3A00Z&time_end=2011-05-27T00%3A00%3A00Z&temporal=point&time=2011-04-10T00%3A00%3A00Z&vertCoord=10.0&accept=csv&point=true
> <http://oos.soest.hawaii.edu/thredds/ncss/grid/pacioos/ncom/hawaii/NCOM_Hawaii_Regional_Ocean_Model_best.ncd?var=water_temp&latitude=21&longitude=-158&time_start=2011-04-10T00%3A00%3A00Z&time_end=2011-05-27T00%3A00%3A00Z&temporal=point&time=2011-04-10T00%3A00%3A00Z&vertCoord=10.0&accept=csv&point=true%20>
> 
> date,lat[unit="degrees_north"],lon[unit="degrees_east"],vertCoord[unit="meter"],water_temp[unit="Celsius"]
> 2011-04-10T00:00:00Z,20.994007110595703,-157.9876251220703,10.0,24.443
> 
> BAD:
> Requesting two variables (water_temp, salinity) at a given depth (10 m)
> returns wrong vertCoord (0.0):
> 
> http://oos.soest.hawaii.edu/thredds/ncss/grid/pacioos/ncom/hawaii/NCOM_Hawaii_Regional_Ocean_Model_best.ncd?var=water_temp,salinity&latitude=21&longitude=-158&time_start=2011-04-10T00%3A00%3A00Z&time_end=2011-05-27T00%3A00%3A00Z&temporal=point&time=2011-04-10T00%3A00%3A00Z&vertCoord=10.0&accept=csv&point=true
> 
> date,lat[unit="degrees_north"],lon[unit="degrees_east"],vertCoord[unit="meter"],water_temp[unit="Celsius"],salinity[unit="1e-3"]
> 2011-04-10T00:00:00Z,20.994007110595703,-157.9876251220703,0.0,24.443,34.724
> 
> Thanks for giving this a look. Seems like a bug that needs fixing. I haven't
> tested whether the same would be true for using NCSS to retrieve an entire
> grid.
> Cheers,
> John Maurer
> Pacific Islands Ocean Observing System (PacIOOS)
> University of Hawaii at Manoa


Ticket Details
===================
Ticket ID: XGC-910742
Department: Support THREDDS
Priority: Critical
Status: Open