[gradsusr] cannot load CO-OPS Great Lake NetCDF datasets
James T. Potemra
jimp at hawaii.edu
Tue Sep 16 17:23:23 EDT 2014
Right, xdfopen. Try the following (note this was made from ncdump of
the file, and it approximates to constant latitude and longitude):
-----------
DSET
http://opendap.co-ops.nos.noaa.gov/thredds/dodsC/NOAA/LMOFS/MODELS/201409/glofs.lmofs.fields.nowcast.20140915.t19z.nc
TITLE Example data file from CO-OPS
UNDEF -99999
XDEF nx 53 LINEAR -87.9721 0.0601
YDEF ny 102 LINEAR 41.5845 0.0450
ZDEF sigma 20 LEVELS 0.0000 0.0227 0.0454 0.0681 0.0908 0.1135 0.1362
0.1589 0.1816 0.2043 0.2270 0.2724 0.3405 0.4313 0.5448 0.6810 0.7945
0.8853 0.9534 1.0000
TDEF time 1 LINEAR 00Z15SEP2014 24HR
VARS 11
lon=>long 0 x,y Longitude
lat=>lati 0 x,y Latitude
mask=>mask 0 x,y Land Mask
depth=>bathy 0 x,y Bathymetry
sigma=>sigma 20 z Sigma vertical coordinate
zeta=>zeta 0 x,y,t Free surface
air_u=>air_u 0 x,y,t Easward Air Velocity
air_v=>air_v 0 x,y,t Northward Air Velocity
u=>u 20 x,y,z,t Eastward Water Velocity
v=>v 20 x,y,z,t Northward Water Velocity
temp=>temp 20 x,y,z,t Temperature
ENDVARS
-----------
On 9/16/14 11:20 AM, Philbrick, Herb wrote:
>
> Thanks, Jim.
>
> I probably will need more details. But, first I'll take a stab at a
> GrADS-like CTL file. I presume xdfopen would be the GrADS command.
>
> Thanks,
>
> Herb
>
> *From:*gradsusr-bounces at gradsusr.org
> [mailto:gradsusr-bounces at gradsusr.org] *On Behalf Of *James T. Potemra
> *Sent:* Tuesday, September 16, 2014 3:45 PM
> *To:* GrADS Users Forum
> *Subject:* Re: [gradsusr] cannot load CO-OPS Great Lake NetCDF datasets
>
> Hi Herb,
>
> You'll need to generate a data descriptor file for this. Note that
> this model output
> is on a rectilinear grid (lat/lon) and sigma-coordinate (vertical), so
> even with a
> descriptor file you will need to make some approximations. On the
> plus side you
> should be able to use the template option to get time-series if needed.
>
> Jim
>
> Let me know if you need more details.
>
> On 9/16/14 9:27 AM, Philbrick, Herb wrote:
>
> Hello,
>
> I would like to access CO-OPS Great Lakes Operational Forecast
> System, GLOFS, datasets using GrADS.
>
> I have never worked with netcdf files.
>
> Nor have I worked with a THREDDS server.
>
> I often access NOMADS through its OpenDAP server using GrADS on my
> PC. The GrADS command is like
>
> Sdfopen http://nomads.ncep.noaa.gov:9090/dods/rap/rap20140915/rap_00z
>
> I have tried the following in GrADS (grads.exe -- opendap enabled
> (see the PS))
>
> Sdfopen
> http://opendap.co-ops.nos.noaa.gov/thredds/wms/NOAA/LMOFS/MODELS/201409/glofs.lmofs.fields.nowcast.20140915.t19z.nc
>
> GrADS returns the following message in the GrADS console:
>
> Scanning self-describing file:
> http://opendap.co-ops.nos.noaa.gov/thredds/dodsC
>
> /NOAA/LMOFS/MODELS/201409/glofs.lmofs.fields.nowcast.20140915.t20z.nc
>
> nc_open failure:
>
> No such file or directory
>
> http://opendap.co-ops.nos.noaa.gov/thredds/dodsC/NOAA/LMOFS/MODELS/201409/glofs.lmofs.fields.nowcast.20140915.t19z.nc
> does not exist or is not a netCDF file.
>
> Couldn't ingest SDF metadata.
>
> If this was an HDF-SDS file, try gradshdf.
>
> I downloaded the nc file to my PC c:\grads19\win32\ sub-directory.
>
> ga-> sdfopen glofs.lmofs.fields.nowcast.20140915.t19z.nc
>
> Scanning self-describing file:
> glofs.lmofs.fields.nowcast.20140915.t19z.nc
>
> SDF file has no discernable X coordinate.
>
> ga->
>
> ncdump on the _downloaded_ file DID obtain sensible information
> for header, variables values, etc.
>
> The _downloaded_ file can be loaded into Excel using the NetCDF
> add-in.
>
> Hence, the downloaded file sure seems to be good.
>
> The folks at CO-OPS do not use GrADS and could not furnish advice.
>
> Can you give me the proper command or settings to use to access
> LMOFS datasets?
>
> Thanks in advance,
>
> Herb Philbrick
>
> PS
>
> I am using Grads19 because, ultimately, I output grib-1 files.
>
> ga-> q config
>
> Config: v1.9.0-rc1 32-bit little-endian readline sdf/xdf netcdf
> dap dap-stn lats
>
> athena printim
>
> Grid Analysis and Display System (GrADS) Version 1.9.0-rc1
>
> Copyright (c) 1988-2005 by Brian Doty and IGES
>
> Center for Ocean-Land-Atmosphere Studies (COLA)
>
> Institute for Global Environment and Society (IGES)
>
> This program is distributed WITHOUT ANY WARRANTY
>
> See file COPYRIGHT for more information.
>
> Built Fri Jan 25 02:30:31 EST 2008 for i686-pc-cygwin
>
> This version of GrADS has been configured with the following options:
>
> o This is a 32-bit LITTLE ENDIAN machine version.
>
> o Command line editing (readline) ENABLED.
>
> o CIRES/CDC (http://www.cdc.noaa.gov) SDF/XDF interface ENABLED.
>
> Use sdfopen/xdfopen to read NetCDF files.
>
> o DTYPE netcdf is ENABLED; DTYPE hdfsds is DISABLED.
>
> o OPeNDAP (a.k.a. DODS) gridded data interface ENABLED.
> (http://opendap.org)
>
> This version is configured to access gridded data on OPeNDAP
> servers
>
> via the sdfopen or xdfopen commands, or using DTYPE netcdf.
>
> o OPeNDAP (a.k.a. DODS) station data interface (gadap) ENABLED.
>
> This version is configured to access station data on OPeNDAP
> servers
>
> via the open command.
>
> o PCMDI (http://www-pcmdi.llnl.gov) LATS interface ENABLED.
>
> This version is configured to write GRIB and NetCDF files.
>
> o DAO (http://dao.gsfc.nasa.gov) Athena Widget GUI ENABLED.
>
> o NRL/DAO/PCMDI XA or ImageMagick Image Output DISABLED.
>
> o printim command for direct png/gif output ENABLED.
>
> (via the GD Library -- http://www.boutell.com/gd)
>
> For additional information please consult http://grads.iges.org/grads/
>
> ga->
>
>
>
>
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