[gradsusr] help displaying from netcdf file

[Jeff Duda]

Eric,
Thanks for your suggestion.  I removed "byteswapped" and the headerbytes
option from my control file, but unfortunately that did not solve the
problem.  Any other ideas?

Jeff

On Mon, Jun 18, 2012 at 10:24 PM, Eric Altshuler <ela at cola.iges.org> wrote:

> Jeff,
>
> For netcdf data, the 'byteswapped' and 'headerbytes' options are
> meaningless. The netcdf format is independent of byte ordering and there
> are always some extra bytes for the metadata. Try removing the byteswapped
> option and the headerbytes entry.
>
> Best regards,
>
> Eric L. Altshuler
> Assistant Research Scientist
> Center for Ocean-Land-Atmosphere Studies
> 4041 Powder Mill Road, Suite 302
> Calverton, MD 20705-3106
> USA
>
> E-mail: ela at cola.iges.org
> Phone: (301) 902-1257
> Fax: (301) 595-9793
>
> ----- Original Message -----
> From: "Jeff Duda" <jeffduda319 at gmail.com>
> To: "GrADS Users Forum" <gradsusr at gradsusr.org>
> Sent: Monday, June 18, 2012 3:22:33 PM
> Subject: [gradsusr] help displaying from netcdf file
>
>
> I'm trying to use Grads to display data from a netCDF file. The result of
> ncdump for that file is
>
> ncdump -h ARW_cn_20110427.nettemp2m079200
> netcdf ARW_cn_20110427 {
> dimensions:
> x = 1163 ;
> y = 723 ;
> z = 1 ;
> variables:
> float temp2m(z, y, x) ;
> temp2m:standard_name = "temp2m" ;
> temp2m:long_name = "temp2m" ;
> temp2m:units = "F" ;
> }
>
> The file size is 3363608 bytes. Given the data are floating point and
> single precision, the size of the data alone are 1163*723*4 = 3363396, for
> a difference of 212 bytes
>
> I made a control file designed to open several hundred individual files to
> display the variable temp2m:
> dset s4%e_arw/ARW_%e_20110427.nettemp2m%ch
> chsub 1 1 003600
> chsub 2 2 007200
> chsub 3 3 010800
> chsub 4 4 014400
> chsub 5 5 018000
> chsub 6 6 021600
> chsub 7 7 025200
> chsub 8 8 028800
> chsub 9 9 032400
> chsub 10 10 036000
> chsub 11 11 039600
> chsub 12 12 043200
> chsub 13 13 046800
> chsub 14 14 050400
> chsub 15 15 054000
> chsub 16 16 057600
> chsub 17 17 061200
> chsub 18 18 064800
> chsub 19 19 068400
> chsub 20 20 072000
> chsub 21 21 075600
> chsub 22 22 079200
> chsub 23 23 082800
> chsub 24 24 086400
> chsub 25 25 090000
> chsub 26 26 093600
> chsub 27 27 097200
> chsub 28 28 100800
> chsub 29 29 104400
> chsub 30 30 108000
> chsub 31 31 111600
> chsub 32 32 115200
> chsub 33 33 118800
> chsub 34 34 122400
> chsub 35 35 126000
> chsub 36 36 129600
> options template byteswapped
> undef -9999.0
> dtype netcdf
> pdef 1163 723 lcc 23.2231 -119.145 1.0 1.0 38.5 38.5 -97.0000 4000.000
> 4000.000
> xdef 1163 linear -128.1065 0.053758
> ydef 723 linear 23.2231 0.040388
> zdef 1 linear 1.0 1.0
> tdef 36 linear 01Z27APR2011 1HR
> edef 10 NAMES cn m21 m23 m24 m25 m26 m27 m28 m29 m30
> VARS 1
> temp2m 1 y,x 2-m temperature (F)
> ENDVARS
> headerbytes 212
>
> When attempting to display the variable in Grads, I get this output:
> ga-> open SSEF_ens_temp2m_20110427_net.ctl
> Scanning description file: SSEF_ens_temp2m_20110427_net.ctl
> Data file s4%e_arw/ARW_%e_20110427.nettemp2m%ch is open as file 1
> LON set to -128.107 -65.6397
> LAT set to 23.2231 52.3832
> LEV set to 1 1
> Time values set: 2011:4:27:1 2011:4:27:1
> E set to 1 1
> Notice: Implied interpolation for file SSEF_ens_temp2m_20110427_net.ctl
> Interpolation will be performed on any data displayed from this file
> ga-> d temp2m
> Notice: Automatic Grid Interpolation Taking Place
> NetCDF Error (gancrow, nc_get_vara_double): NetCDF: Index exceeds
> dimension bound
> Data Request Error: Error for variable 'temp2m'
> Error ocurred at column 1
> DISPLAY error: Invalid expression
> Expression = temp2m
>
> I have also tried altering the line
> temp2m 1 y,x 2-m temperature (F)
> by the line
> temp2m 1 z,y,x 2-m temperature (F)
> in accordance with the output from ncdump. No avail.
>
> Please help me determine the reason for this error and how to fix it.
> Thanks.
>
> Jeff Duda
> --
> Jeff Duda
> Graduate research assistant
> University of Oklahoma School of Meteorology
> Center for Analysis and Prediction of Storms
>
>
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-- 
Jeff Duda
Graduate research assistant
University of Oklahoma School of Meteorology
Center for Analysis and Prediction of Storms
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