Using GrADS to retrieve HYCOM data

[Mark Hess]

Think I still must be doing something wrong and/or missing a few important concepts.  Here's what I get:

ga-> sdfopen http://hycom.coaps.fsu.edu/opendap/nph-dods/datasets/hycom/global/GLBa0.08_rect/data/2d/rarchv.2009_125_00_2d.nc
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
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
read_metadata: gaopnc failed 
gadsdf: Couldn't ingest SDF metadata.

Perhaps I need to work on creating a .ctl file?  Any help with that is appreciated.

Thanks,

Mark



  ----- Original Message ----- 
  From: James T. Potemra 
  To: GRADSUSR at LIST.CINECA.IT 
  Sent: Tuesday, May 05, 2009 5:29 PM
  Subject: Re: Using GrADS to retrieve HYCOM data


  Hi Mark:

  Your variable constraints look more like Matlab syntax to me.  If you
  simply use sdfopen http://...... .nc (truncate
  everythins from the ? to the end) it should work.  You'll then have
  access to the entire data file and can just
  'set x 1500 2300', 'set y 1750 2169', and so on, then 'd mld'

  Jim

  Mark Hess wrote:
  > 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 <mailto:Dan_Martin at BUOYWEATHER.COM>
  >     *To:* GRADSUSR at LIST.CINECA.IT <mailto: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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