Using GrADS to retrieve HYCOM data
James T. Potemra
jimp at HAWAII.EDU
Wed May 6 13:30:48 EDT 2009
Hi Mark:
I think something is up with your version of GrADS. Here's what I get
from grads-v2.0.a5.oga.4
Welcome to the OpenGrADS Bundle Distribution
--------------------------------------------
For additional information enter "opengrads --help".
Starting
"/usr/local/grads-2.0.a5.oga.4/Contents/Linux/Versions/2.0.a5.oga.4/x86_64/grads
-HC 1 -l -g 1000x800 " ...
Grid Analysis and Display System (GrADS) Version 2.0.a5.oga.4
Copyright (c) 1988-2008 by Brian Doty and the
Institute for Global Environment and Society (IGES)
GrADS comes with ABSOLUTELY NO WARRANTY
See file COPYRIGHT for more information
Config: v2.0.a5.oga.4 little-endian readline printim grib2 netcdf
hdf4-sds opendap-grids,stn athena geotiff
Issue 'q config' command for more information.
Loading User Defined Extensions table
</usr/local/grads-2.0.a5.oga.4/Contents/Linux/Versions/2.0.a5.oga.4/x86_64/gex/udxt>
... ok.
GX Package Initialization: Size = 11 8.5
Command line history in /export/lii/jimp/.grads.log
*sdfopen
http://hycom.coaps.fsu.edu/opendap/nph-dods/datasets/hycom/global/GLBa0.08_rect/data/2d/rarchv.2009_125_00_2d.nc
<mhtml:%7BAFB7F805-B3C0-4E25-B941-0C69528BC204%7Dmid://00009160/%21x-usc: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
SDF file
http://hycom.coaps.fsu.edu/opendap/nph-dods/datasets/hycom/global/GLBa0.08_rect/data/2d/rarchv.2009_125_00_2d.nc
is open as file 1
LON set to 74.16 434.08
LAT set to -78.64 46.8781
LEV set to 0 0
Time values set: 2009:5:5:0 2009:5:5:0
E set to 1 1
ga-> q file
File 1 : HYCOM GLBa0.08
Descriptor:
http://hycom.coaps.fsu.edu/opendap/nph-dods/datasets/hycom/global/GLBa0.08_rect/data/2d/rarchv.2009_125_00_2d.nc
Binary:
http://hycom.coaps.fsu.edu/opendap/nph-dods/datasets/hycom/global/GLBa0.08_rect/data/2d/rarchv.2009_125_00_2d.nc
Type = Gridded
Xsize = 4500 Ysize = 2170 Zsize = 1 Tsize = 1 Esize = 1
Number of Variables = 8
date 0 t date
mld 0 t,y,x MLT (0.20 degC) [90.6H]
mlp 0 t,y,x MLT (0.03 kg/m3) [90.6H]
qtot 0 t,y,x surf. heat flux [90.6H]
emp 0 t,y,x surf. water flux [90.6H]
surface_tempera 0 t,y,x surf. temp. trend [90.6H]
surface_salinit 0 t,y,x surf. saln. trend [90.6H]
ssh 0 t,y,x sea surf. height [90.6H]
ga->
Jim
Mark Hess wrote:
> 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
> <mhtml:%7BAFB7F805-B3C0-4E25-B941-0C69528BC204%7Dmid://00009160/%21x-usc: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
> <mhtml:%7BAFB7F805-B3C0-4E25-B941-0C69528BC204%7Dmid://00009160/%21x-usc: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
> <mhtml:%7BAFB7F805-B3C0-4E25-B941-0C69528BC204%7Dmid://00009160/%21x-usc: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 <mailto:jimp at HAWAII.EDU>
> *To:* GRADSUSR at LIST.CINECA.IT <mailto: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
> <http://hycom.coaps.fsu.edu/opendap/nph-dods/datasets/hycom/global/GLBa0.08_rect/data/2d/rarchv.2009_125_00_2d.nc?mld%5B0:1:0%5D%5B1750:1:2169%5D%5B1500:1:2300>]
> >
> > 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
> <http://hycom.coaps.fsu.edu/opendap/nph-dods/datasets/hycom/global/GLBa0.08_rect/data/2d/rarchv.2009_125_00_2d.nc?mld%5B0:1:0%5D%5B1750:1:2169%5D%5B1500:1:2300>]
> > 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
> <http://hycom.coaps.fsu.edu/opendap/nph-dods/datasets/hycom/global/GLBa0.08_rect/data/2d/rarchv.2009_125_00_2d.nc?mld%5B0:1:0%5D%5B1750:1:2169%5D%5B1500:1:2300>]
> > 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> <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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