Using GrADS to retrieve HYCOM data

[Mark Hess]

Can anyone tell me what I am doing wrong here?  At this point I'm just trying to get a file off of the HYCOM server.  I used the server http://hycom.coaps.fsu.edu/opendap/nph-dods/datasets/hycom/global/GLBa0.08_rect/data/2d/rarchv.2009_125_00_2d.nc.html to generate the URL string below, but am obviously missing something quite basic (I'm an inexperienced GrADS user and brand new to OPeNDAP). Will I need to create a custom .ctl file to access and display these data or am I simply using the sdfopen command incorrectly? 

I am running GrADS version 2.0.a3.  My command and result are below.

ga-> sdfopen http://hycom.coaps.fsu.edu/opendap/nph-dods/datasets/hycom/global/GLBa0.08_rect/data/2d/rarchv.2009_125_00_2d.nc?mld[0:1:0][1750:1:2169][1500:1:2300]          
Scanning self-describing file:
http://hycom.coaps.fsu.edu/opendap/nph-dods/datasets/hycom/global/GLBa0.08_rect/data/2d/rarchv.2009_125_00_2d.nc?mld[0:1:0][1750:1:2169][1500:1:2300]
gaopnc error: nc_open failed to open file
http://hycom.coaps.fsu.edu/opendap/nph-dods/datasets/hycom/global/GLBa0.08_rect/data/2d/rarchv.2009_125_00_2d.nc?mld[0:1:0][1750:1:2169][1500:1:2300]
read_metadata: gaopnc failed 
gadsdf: Couldn't ingest SDF metadata.
ga-> 

Mark
  ----- Original Message ----- 
  From: Dan Martin 
  To: GRADSUSR at LIST.CINECA.IT 
  Sent: Thursday, April 30, 2009 7:40 PM
  Subject: Re: Using GrADS to retrieve HYCOM data


  The full HYCOM data is on a curvilinear grid that I haven't been able to
  make work in grads. They set up a linear grid for grads users by cutting
  off pre-gridded section above 48 degrees north.

  http://hycom.coaps.fsu.edu/opendap/nph-dods/datasets/hycom/global/GLBa0.08_rect/data/

  The update schedule is a bit irregular and the server is not alway up,
  but nice data when it is there.

  If anyone has the curvilinear grid version working in grads, any tips
  would be nice.

  Dan

  Mark Hess wrote:
  > Has anyone out there used GrADS to retrieve and display data from the
  > HYCOM OPeNDAP near real-time data server
  > http://hycom.coaps.fsu.edu/thredds/dodsC/glb_nrt_analysis.html?
  >
  > I am hoping to use GrADS to retrieve mixed layer depth data from this
  > server, but not real clear on the http/OPeNDAP string I would use to
  > download the file (whether it be ASCII or binary).  If you have done
  > this and could send a sample script or command showing the http
  > line that would be much appreciated.
  >
  > Thanks,
  >
  > Mark
  >
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