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

Sat Aug 24 17:42:13 EDT 2013

Hi Ned,

As an alternate to xdfopen I would like to offer a suggestion. If you
sdfopen one of the HDF files, then run "q ctlinfo"  you will see most if
not all of what you need to make a ctl file that will open the HDF with
the "open" command. You'll need to template your files. I have found this
approach much less frustrating than trying to figure out xdfopen files.

Mike

On Fri, Aug 23, 2013 at 11:16 AM, Vizy, Edward K <ned at jsg.utexas.edu> 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****
>
> phone: 512-585-1937****
>
> ** **
>
> ** **
>
> _______________________________________________
> gradsusr mailing list
> gradsusr at gradsusr.org
> http://gradsusr.org/mailman/listinfo/gradsusr
>
>
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