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Anotinio et al, Thanks for your help. The command line option is attractive and I will give that a try. One thing that eludes me is how to specify the ranges for latitude and longitude correctly. If for instance I would like data for the Bay of Bengal BB defined by (0N,75E) (25N,99E), how would I specify this in the infile. I do see the DDS parameters, but am unclear how to formulate the ranges or even how to determine what the corresponding ranges are, given a geographic bounding box. Help on this would be greatly appreciated. Perhaps there is some documentation with some examples? Harper On Fri, Jun 21, 2013 at 10:09 AM, "Antonio S. Cofiño" < antonio.cofino@xxxxxxxxx> wrote: > Harper, > > You can use the NetCDF library with opendap capabilities: > http://www.unidata.ucar.edu/**software/netcdf/docs/netcdf/** > DAP-Support.html<http://www.unidata.ucar.edu/software/netcdf/docs/netcdf/DAP-Support.html> > > more exactly the nccopy tool: > http://www.unidata.ucar.edu/**software/netcdf/docs/netcdf/**nccopy.html<http://www.unidata.ucar.edu/software/netcdf/docs/netcdf/nccopy.html> > > which can be used to copy the remote data to a local file. The nccopy will > download the whole dataset in small sets based on the buffer parameter: > > For example, > nccopy -k 4 -d 9 -s -u http://ncss1.hycom.org/** > thredds/dodsC/GLBa0.08/expt_**90.9/2013/uvel<http://ncss1.hycom.org/thredds/dodsC/GLBa0.08/expt_90.9/2013/uvel> > uvel.nc > > will download the 346863.0 Mbytes to a local NetCDF file named uvel.nc. > (please look the doc, dfor the meaning of the -k, -d and -s flags) > > If you want to download just a subset of the whole dataset, you can you > use the subset form: > http://ncss1.hycom.org/**thredds/dodsC/GLBa0.08/expt_**90.9/2013/uvel.html<http://ncss1.hycom.org/thredds/dodsC/GLBa0.08/expt_90.9/2013/uvel.html> > > make all your selectiosn for the subsetting and use the resulting "Data > URL" as the "infile" argument for the nccopy command. > > I hope this helps > > Regards > > Antonio > > -- > Antonio S. Cofiño > Grupo de Meteorología de Santander > Dep. de Matemática Aplicada y > Ciencias de la Computación > Universidad de Cantabria > http://www.meteo.unican.es > > El 21/06/2013 1:33, Harper Simmons escribió: > >> >> Thanks Michael. >> >> I was helped by John Maurer and made some progress on a smaller >> extraction that I needed to perform. Unfortunately when trying to perform >> an extraction for a larger area, probably amounting to several GB, I ran >> into what John M. identified as a 500MB limit on the opendap back end. >> >> I am trying to learn do construct my extraction with matlab 2012b since >> limiting my queries to 500MB per query is proving to be too time intensive >> to accomplish interactively. I was hoping that matlab's scripting >> capabilities would make this painless. >> >> I have never used DoDs or opendap with matlab before but this far I am >> also finding this to be extremely slow (45 minutes to extract just the >> latitude data or just the longitude data). Would using the URL below >> possibly work better for this? >> >> Harper >> >> >> On Thu, Jun 20, 2013 at 3:25 PM, Michael McDonald >> <mcdonald@xxxxxxxxxxxxx<mailto: >> mcdonald@xxxxxxxxxxxxx**>> wrote: >> >> Harper, >> This is a server-side problem we are working on. >> If you switch the URL over to one of our new test servers it will >> work, e.g., >> >> http://ncss1.hycom.org/**thredds/ncss/grid/GLBa0.08/** >> expt_90.9/2013/uvel/dataset.**html<http://ncss1.hycom.org/thredds/ncss/grid/GLBa0.08/expt_90.9/2013/uvel/dataset.html> >> http://ncss2.hycom.org/**thredds/ncss/grid/GLBa0.08/** >> expt_90.9/2013/uvel/dataset.**html<http://ncss2.hycom.org/thredds/ncss/grid/GLBa0.08/expt_90.9/2013/uvel/dataset.html> >> >> We will be making "ncss.hycom.org <http://ncss.hycom.org>" into a >> >> load balance DNS-RR name >> soon once we've verified that the new THREDDS servers are running >> properly. >> >> /mike >> >> >> >> On Thu, Jun 20, 2013 at 1:28 PM, Harper Simmons >> <hlsimmons@xxxxxxxxxx <mailto:hlsimmons@xxxxxxxxxx>> wrote: >> > >> > Dear Thredds, >> > >> > I am trying to extract a portion of the South China Sea over the >> time period >> > from April 1 to June 1 of this year and the data extraction >> hangs for 10+ >> > minutes and then times out. I have tried smaller quieries >> (smaller areas, >> > less time) and have tried initiating from various machines and >> browsers. I >> > expect it is a server side problem rather than client side. >> > >> > >> http://ncss.hycom.org/thredds/**ncss/grid/GLBa0.08/expt_90.9/** >> 2013/uvel/dataset.html<http://ncss.hycom.org/thredds/ncss/grid/GLBa0.08/expt_90.9/2013/uvel/dataset.html> >> > >> > I have tried this both with single parameters (uvel) and >> multiple parameters >> > as I would like all of the 3D model state variables and 2D >> forcing data. >> > >> > I am asking for the bounding box >> > >> > N = 24, S = 16, W = 116, E = 124 >> > >> > Starting time = 2013-04-01T00:00:00Z >> > Ending time = 2013-06-01T00:00:00Z >> > >> > Any help would be much appreciated >> > >> > Harper >> > >> > >> > ______________________________**_________________ >> > thredds mailing list >> > thredds@xxxxxxxxxxxxxxxx >> <mailto:thredds@xxxxxxxxxxxx.**edu<thredds@xxxxxxxxxxxxxxxx> >> > >> >> > For list information or to unsubscribe, visit: >> > >> http://www.unidata.ucar.edu/**mailing_lists/<http://www.unidata.ucar.edu/mailing_lists/> >> >> >> >> >> ______________________________**_________________ >> thredds mailing list >> thredds@xxxxxxxxxxxxxxxx >> For list information or to unsubscribe, visit: >> http://www.unidata.ucar.edu/**mailing_lists/<http://www.unidata.ucar.edu/mailing_lists/> >> > >
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