[gradsusr] Issue creating an opendap xdf control file that works for 3-hour MERRA MAI3CPASM.5.2.0

Mon Aug 26 09:18:55 EDT 2013

Thanks Jim....That did work, but I find it odd that on my local system it would not work unless I included the :EOSGRID......

________________________________
From: gradsusr-bounces at gradsusr.org <gradsusr-bounces at gradsusr.org> on behalf of James T. Potemra <jimp at hawaii.edu>
Sent: Saturday, August 24, 2013 1:04 PM
To: GrADS Users Forum
Subject: Re: [gradsusr] Issue creating an opendap xdf control file that works for 3-hour MERRA MAI3CPASM.5.2.0

Hi Ned:

It seems like the time variable defined in the file is "TIME" and not "TIME:EOSGRID".  I think if
you change the TDEF line to
TDEF TIME 248 linear 00Z01JAN1979 3hr
it should work.

Jim

On 8/23/13 5:16 AM, Vizy, Edward K wrote:
Hi All,

I’m trying to open the MERRA 3-hourly MAI3CPASM.5.2.0 data using GrADS opendap.  I want to open multiple days at once to generate time averages, hence I need to create and use a control file I create to open all of the hdf files in the MERRA collection that I am interested in using xdfopen.
I have created the following control file:
_______________________________________________
dset http://goldsmr3.sci.gsfc.nasa.gov/opendap/MERRA/MAI3CPASM.5.2.0/%y4/%m2/MERRA100.prod.assim.inst3_3d_asm_Cp.%y4%m2%d2.hdf
options template
TDEF TIME:EOSGRID 248 linear 00Z01JAN1979 3hr
_______________________________________________

but when I go to execute it in GrADS I get the following error message:

[MAI3CPASM.5.2.0]$ grads

Grid Analysis and Display System (GrADS) Version 2.0.2
Copyright (c) 1988-2011 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: v2.0.2 little-endian readline printim grib2 netcdf hdf4-sds hdf5 opendap-grids,stn geotiff shapefile
Issue 'q config' command for more detailed configuration information
Landscape mode? ('n' for portrait):  y
GX Package Initialization: Size = 11 8.5
ga-> xdfopen test.opendap.ctl
Scanning Descriptor File:  test.opendap.ctl
gadsdf: Time dimension TIME:EOSGRID is not an SDF dimension.
SDF Descriptor file test.opendap.ctl was not successfully opened & parsed.

Having this failure I backtracked and downloaded the MERRA data via FTP to my local machine and created a similar xdf control file to access the data on the local system:
______________________________________________________

dset ^./%y4/%m2/MERRA100.prod.assim.inst3_3d_asm_Cp.%y4%m2%d2.hdf
options template
TDEF TIME:EOSGRID 248 linear 00Z01JAN1979 3hr
______________________________________________________

When I run this in GrADS everything works as it should and I can access all the MERRA data.  Am I missing something for opendap that I need to include in the xdf control file?  Alternatively, has anyone been able to successfully create a xdf control file to read the 3-hourly data from MERRA via opendap?

Here is my GrADS build info:
Config: v2.0.2 little-endian readline printim grib2 netcdf hdf4-sds hdf5 opendap-grids,stn geotiff shapefile
Grid Analysis and Display System (GrADS) Version 2.0.2
Copyright (c) 1988-2011 by Brian Doty and the
Institute for Global Environment and Society (IGES)
This program is distributed WITHOUT ANY WARRANTY
See file COPYRIGHT for more information.

Built Thu Nov  8 13:55:26 EST 2012 for x86_64-unknown-linux-gnu

This version of GrADS has been configured with the following options:
  o Built on a LITTLE ENDIAN machine
  o Athena Widget GUI DISABLED
  o Command line editing ENABLED
      http://tiswww.case.edu/php/chet/readline/rltop.html
  o printim command for image output ENABLED
      http://www.zlib.net
      http://www.libpng.org/pub/png/libpng.html
      http://www.libgd.org/Main_Page
  o GRIB2 interface ENABLED
      http://www.ijg.org
      http://www.ece.uvic.ca/~mdadams/jasper
      http://www.nco.ncep.noaa.gov/pmb/codes/GRIB2
      g2clib-1.4.0
  o NetCDF interface ENABLED
      http://www.unidata.ucar.edu/software/netcdf
      netcdf 4.1.2 of Oct  5 2011 11:54:30 $
  o OPeNDAP gridded data interface ENABLED
  o OPeNDAP station data interface ENABLED
      http://iges.org/grads/gadoc/supplibs.html
      libgadap 2.0
  o HDF4 and HDF5 interfaces ENABLED
      http://hdfgroup.org
      HDF 4.2r3
      HDF5 1.8.7
  o GeoTIFF and KML/TIFF output ENABLED
      http://www.libtiff.org
      http://geotiff.osgeo.org
  o KML contour output ENABLED
  o Shapefile interface ENABLED
      http://shapelib.maptools.org

Many thanks,

Ned

Dr. Edward “Ned” Vizy
Research Engineer/Scientist Associate V
Jackson School of Geosciences
Department of Geological Sciences
The University of Texas at Austin
1 University Station C1100
Austin, Texas 78712
e-mail: ned at jsg.utexas.edu<mailto:ned at jsg.utexas.edu>
phone: 512-585-1937

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