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<p>I'm trying to do something which I think should be relatively
simple, but I think my lack of understanding of gridded files is
causing me problems.</p>
<p>I'd like to take the NetCDF output file from a WRF run and just
pull out the variables I need, so that I have a smaller version of
the file that I can work with. I'm giving it to somebody to load
into IDV and they need to be able to aggregate times. I would like
to be able to plot horizontal and vertical velocity at different
levels in the model, and keep the time information so that I can
see the evolution. My program runs, but IDV tells me that there is
"No gridded data" found in my output file. <br>
</p>
<p>My question is what do I need to do to make this a gridded data
file?</p>
<p>Here is some example code, I used unstagger because I thought
that might be my problem, but unstaggering didn't seem to help.</p>
<p>Thanks,</p>
<p>Jim</p>
<p><br>
</p>
<p>begin<br>
;<br>
<br>
;***************************************************<br>
; Open full NetCDF file and get variable names<br>
;***************************************************<br>
<br>
nc_in = addfile("wrfout_d02_2018-07-22_06:00:00.nc","r")<br>
<br>
<br>
;***************************************************<br>
; Open output netcdf file. Remove first just in case.<br>
;***************************************************<br>
nc_out_fname = "testout.nc"<br>
system("rm -f " + nc_out_fname) ; remove any pre-existing file
<br>
ncdf_out = addfile(nc_out_fname,"c") <br>
<br>
<br>
;***************************************************<br>
; Specify desired variables <br>
;***************************************************<br>
<br>
lat = nc_in->XLAT<br>
lon = nc_in->XLONG<br>
znu = nc_in->ZNU<br>
u = nc_in->U<br>
v = nc_in->V<br>
w = nc_in->W<br>
ua = wrf_user_unstagger(u,u@stagger)<br>
va = wrf_user_unstagger(v,v@stagger)<br>
wa = wrf_user_unstagger(w,w@stagger)<br>
<br>
xtime = nc_in->XTIME<br>
<br>
<br>
ncdf_out->LAT = lat<br>
ncdf_out->LON = lon<br>
ncdf_out->ZNU = znu<br>
ncdf_out->U = ua<br>
ncdf_out->V=va<br>
ncdf_out->W=wa<br>
<br>
ncdf_out->XTIME = xtime<br>
<br>
end<br>
</p>
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<p style="text-decoration:none; color:#000000; font-size:13px;
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