Harper,
You can use the NetCDF library with opendap capabilities:
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
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 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
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://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
>
> 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
>
>
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