Re: [thredds] nothing happens when trying to extract subset of HYCOM data

• To: Michael McDonald <mcdonald@xxxxxxxxxxxxx>
• Subject: Re: [thredds] nothing happens when trying to extract subset of HYCOM data
• From: Harper Simmons <harper.simmons@xxxxxxxxx>
• Date: Thu, 20 Jun 2013 15:33:54 -0800

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>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" 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>
> 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
> >
> >
> > _______________________________________________
> > thredds mailing list
> > thredds@xxxxxxxxxxxxxxxx
> > For list information or to unsubscribe,  visit:
> > http://www.unidata.ucar.edu/mailing_lists/
>

• Follow-Ups:
  • Re: [thredds] nothing happens when trying to extract subset of HYCOM data
    • From: "Antonio S. Cofiño"

• References:
  • [thredds] nothing happens when trying to extract subset of HYCOM data
    • From: Harper Simmons
  • Re: [thredds] nothing happens when trying to extract subset of HYCOM data
    • From: Michael McDonald