[gradsusr] help displaying from netcdf file

[Yaqiang Wang]

netCDF data file should include enough information to describe itself.
But your data have no values of x, y and z, also projection attributes
are absent.

On Tue, Jun 19, 2012 at 3:22 AM, Jeff Duda <jeffduda319 at gmail.com> wrote:
> 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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>



-- 
*************************************************
Dr. Yaqiang Wang
Chinese Academy of Meteorological Sciences (CAMS)
46, Zhong-Guan-Cun South Avenue
Beijing, 100081
China

yaqiang.wang at gmail.com

http://www.meteothinker.com
**************************************************