using xdfopen on a .nc file

[Chi Mai Nguyen]

Hi Lisa,

Setting ZDEF is just for grads to display the labels on z axis accordingly to what you have desribed in the LEVELS.

I think you should put in 'zrev' in OPTIONS such as:
OPTIONS zrev

Hope that this will fix your problem.

Good luck,
Mai


Lisa Murphy <lmurphy at ATMOS.UMD.EDU> wrote:
> Dear All,
>
> My run of the Single column community climate model (SCAM) produced a
> netcdf
> output file. SDFOPEN and OPEN didn't work so I opened it in GrADS by
> doing
> an xdfopen on a data descriptor file (.ddf). Under the grads website it
> said to enter in the least amount of information into the ddf so that
> grads
> pulls most of the information from the .nc file. So I tried it with just:
>
> DSET /run_ctl_10yr.nc
> XDEF lon 1 levels 23
> YDEF lat 1 levels 35
>
> The file opened and I was able to plot the data but when I tried to plot
> the
> multiple level variables the vertical axis was upside down (1000mb was at
> the top and 1mb at the bottom).
>
> I tried creating another .ddf file by inputting zdef with the 26 levels
> in
> the order in which you would put them if you were creating a regular
> control
> file (not the order it appears when you do ncdump):
>
> DSET /run_ctl_10yr.nc
> XDEF lon 1 levels 23
> YDEF lat 1 levels 35
> ZDEF lev 26 levels 999.120684958666, 976.965519334695, 935.765736387855,
> 872.828394498624, 792.798658152295, 701.239586497683, 604.275579011531,
> 513.559441962607, 436.449217157429, 370.90429427665, 315.190036222099,
> 267.831911732807, 227.576829588822, 193.359407868247, 164.273984606776,
> 139.550908021003, 118.535909681669, 100.672811033688, 85.4888992285199,
>     70.0591400000001, 53.1146000000002, 37.2302900000001, 23.94463,
>     13.9672100000001, 7.38881300000002, 3.54463800000002
>
> This gave the correct z-axis but the data wasn't right. I opened the same
> file using the two .ddf files in the same grads session. I set z=16 for
> both files and then displayed the temperature. The temperature was
> exactly
> the same for the two .ddf files even though lev=139.551 in the first file
> and lev=315.19 in the second file. Could anybody tell me what I'm doing
> wrong??
>
> Thank you!
>
> Lisa
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Nguyen Chi Mai
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