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[THREDDS #MLL-831526]: NaN returning from motherlode thredds ncss for RAP



Hi Daryl,

the THREDDS deployed in motherlode 9080 is still an alpha release 
(4.3.10-alpha) and for this version the behaviour of the parameters for 
the NetCDF Subset Service was modified but the form what you get from in 
the web interface doesn't reflect this new behaviour yet.
The problem is the form adds a param time to the requests and you only 
get values for the specified instant in the param time regardless the 
time range. If you remove the param time from the url and define a time 
range with two of the params time_start, time_end and time_duration it 
should work.
An example:
-URL from the THREDDS web interface, with time param (so the time range 
is ignored and one single time is returned):
http://motherlode.ucar.edu:9080/thredds/ncss/grid/grib/NCEP/RAP/CONUS_13km/files/RR_CONUS_13km_20120619_1900.grib2?var=Relative_humidity_height_above_ground&var=Temperature_height_above_ground&latitude=42.11&longitude=-95.11&temporal=range&time_start=2012-06-19T19%3A00%3A00.000Z&time_end=2012-06-20T04%3A00%3A00.000Z&time=2012-06-19T19%3A00%3A00.000Z&vertCoord=&accept=xml&point=true

-Same URL as above removing param time (and some others that are not 
needed as well):
http://motherlode.ucar.edu:9080/thredds/ncss/grid/grib/NCEP/RAP/CONUS_13km/files/RR_CONUS_13km_20120619_1900.grib2?var=Relative_humidity_height_above_ground&var=Temperature_height_above_ground&latitude=42.11&longitude=-95.11&time_start=2012-06-19T19%3A00%3A00.000Z&time_end=2012-06-20T04%3A00%3A00.000Z&&vertCoord=&accept=xml

You can check the new parameter specification in:
http://www.unidata.ucar.edu/projects/THREDDS/tech/interfaceSpec/NetcdfSubsetService_4_3.html
 

And, of course we'll fix the form for the stable 4.3 release.
Thank you very much for reporting this and any feedback about the 
parameter specification would be highly appreciated.

Cheers!!

On 06/23/2012 09:32 AM, daryl herzmann wrote:
> New Client Reply: NaN returning from motherlode thredds ncss for RAP
>
> On Fri, 22 Jun 2012, Unidata THREDDS Support wrote:
>
>>> Hi Unidata,
>>>
>>> I go here:
>>>
>>> http://motherlode.ucar.edu/thredds/ncss/grid/fmrc/NCEP/RAP/CONUS_13km/runs/NCEP-RAP-CONUS_13km_RUN_2012-06-19T16:00:00Z/pointDataset.html
>>>
>>> Click the temp and relh fields for 2m, specify 42.11 latitude and -95.11
>>> longitude.  Set vertical level to 2. format XML.  Submit
>>>
>>> and get NaNs for both fields.
>>>
>>> http://motherlode.ucar.edu/thredds/ncss/grid/fmrc/NCEP/RAP/CONUS_13km/runs/NCEP-RAP-CONUS_13km_RUN_2012-06-19T16:00:00Z?var=Relative_humidity_height_above_ground&var=Temperature_height_above_ground&latitude=42.11&longitude=-95.11&temporal=all&time_start=2012-06-19T16%3A00%3A00Z&time_end=2012-06-20T01%3A00%3A00Z&time=2012-06-19T16%3A00%3A00Z&vertCoord=2&accept=xml&point=true
>>>
>>> Could you kindly point out what I am doing wrong?
>>>
>>> daryl
>>>
>> Hi Daryl,
>>
>> I reproduced the problem you were having, but solving it led to finding
>> another problem.  The behaviour you observed has been fixed, and you can
>> try using motherlode.ucar.edu:9080 to get to the data; however, ncss on
>> 9080 will think that you are trying to download a grib file.  You're
>> not, and we can and will fix that issue pretty easily.
>>
>> http://motherlode.ucar.edu:9080/thredds/ncss/grid/grib/NCEP/RAP/CONUS_13km/files/RR_CONUS_13km_20120619_1900.grib2/pointDataset.html
> Thanks, but now I am unable to get more than one timestep from the
> dataset?  Could you provide the URL that works providing the data
> described above?
>
> daryl
>



Ticket Details
===================
Ticket ID: MLL-831526
Department: Support THREDDS
Priority: Normal
Status: Open


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