Re: [thredds] NetCDF Subset Service

• To: Nathan Potter <ndp@xxxxxxxxxxx>
• Subject: Re: [thredds] NetCDF Subset Service
• From: "Signell, Richard" <rsignell@xxxxxxxx>
• Date: Fri, 17 Jun 2016 10:41:23 -0400

Nathan,
I took your same request, but changed the horizontal stride from 1 to
100 (horizStride=100)

http://thredds.ucar.edu/thredds/ncss/grib/NCEP/GFS/Global_0p25deg/best?var=u-component_of_wind_isobaric&var=v-component_of_wind_isobaric&horizStride=100&time_start=2016-06-13T00%3A00%3A00Z&time_end=2016-07-02T06%3A00%3A00Z&timeStride=1&vertCoord=&addLatLon=true&accept=netcdf4

It took 12 minutes, but successfully completed the request, delivering
a 2MB netcdf4 file which I've attached and placed here:

http://geoport-dev.whoi.edu/thredds/catalog/usgs/data2/rsignell/test/catalog.html?dataset=usgs/data2/rsignell/test/best.nc

Checking out the DDS at
http://geoport-dev.whoi.edu/thredds/dodsC/usgs/data2/rsignell/test/best.nc.dds
I see that you are asking for 117 time steps, and there are 31
vertical levels in these variables.

Did you really want all that?

Your original request (with horizStride=1) would have been a request
for 100x100=10,000 times more data, or roughly 20GB of data.   Perhaps
that's why it crapped out?

But I agree the original error message you received was not very informative.

-Rich



On Thu, Jun 16, 2016 at 1:18 PM, Nathan Potter <ndp@xxxxxxxxxxx> wrote:
>
> I used this form:
>
>   
> http://thredds.ucar.edu/thredds/ncss/grib/NCEP/GFS/Global_0p25deg/best/dataset.html
>
> To construct this NetCDF Subset Service request:
>
>   
> http://thredds.ucar.edu/thredds/ncss/grib/NCEP/GFS/Global_0p25deg/best?var=u-component_of_wind_isobaric&var=v-component_of_wind_isobaric&horizStride=1&time_start=2016-06-13T00%3A00%3A00Z&time_end=2016-07-02T06%3A00%3A00Z&timeStride=1&vertCoord=&addLatLon=true&accept=netcdf4
>
> Which returns the following remarkably cryptic message:
>
>   first (-66) must be >= 0
>
> Does anybody have some thoughts as to what I might change to make the request 
> successful, or to get a more understandable message?
>
>
> Thanks,
>
> Nathan
>
>
> = = =
> Nathan Potter                        ndp at opendap.org
> OPeNDAP, Inc.                        +1.541.231.3317
>
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-- 
Dr. Richard P. Signell   (508) 457-2229
USGS, 384 Woods Hole Rd.
Woods Hole, MA 02543-1598

Attachment: best.nc4
Description: Binary data

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