[gradsusr] OpenGrads/Grads: Cannot plot colorbar, no shading information

[AMS Bytča]

Hi Tim,

try adding a really small number to plotted expression like:

'd cape180_0mb+cos(lat*3.1416/180)*1e-6' ---- this work for my 
precipitaion charts eg.


or

'set clevs *-4000* 0 200 400 600 800 1000 ..... 'set ccols *16* 16 17 18 
19 20 21 22 .....


Marian




Dňa 23.2.2019 o 11:49 Tim Van Damme napísal(a):
>
> Hello all,
>
> Lately I am experiencing some issues with plotting GFS data on charts. 
> I used the cbarn.gs from the old opengrads version and the newer 
> version as well as cbar cbarb cbarc etc… It all comes down to the same 
> error: Cannot plot colorbar, no shading information
>
> Once I start plotting a timeseries some of them go well and get the 
> colorbar, others don’t. I have been searching for an explanation but 
> couldn’t come up with one. I have it on the 0.25 0.50 and 1 degree GFS 
> data. I have it for some charts, others don’t seem to have the issue. 
> For example the Cape and Cinh charts do struggle with it, the 
> temperature, dewpoint and low level shear don’t.
>
> An example is below. It is the script that is started through a .bat 
> file that plots the cape 180mb  data. Maybe someone of you guys might 
> find the error?
>
> **
>
> function main(args)
>
> * Parse the arguments: date, hour
>
>   if (args = '')
>
>   prompt 'Enter forecast date (example, 20110717) --> '
>
>   pull date
>
>   prompt 'Enter forecast hour (example, 00 or 06 or 12 or 18) --> '
>
>   pull hour
>
>   else
>
>   date = subwrd(args,1)
>
>   hour  = subwrd(args,2)
>
>   endif
>
> 'reinit'
>
> 'sdfopen 
> https://nomads.ncep.noaa.gov:9090/dods/gfs_0p25/gfs'date'/gfs_0p25_'hour'z'
>
> SAY 180Cape
>
> * Get info from the descriptor file
>
> 'q ctlinfo'
>
> _ctl = result
>
> _undef = getctl(undef)
>
> _tdef = getctl(tdef)
>
> _zdef = getctl(zdef)
>
> maps = 66
>
> * Get the Time axis info
>
> tsize = subwrd(_tdef,2)
>
> _t1 = 1       ;* 2nd half of timeseries
>
> _t2 = 45
>
> tsize = _t2 - _t1 + 1
>
> 'set t '_t1' '_t2
>
> 'q dims'
>
> times  = sublin(result,5)
>
> _time1 = subwrd(times,6)
>
> _time2 = subwrd(times,8)
>
> _tdim = _time1' '_time2
>
> tincr = subwrd(_tdef,5)
>
> _tdef = 'tdef 'tsize' linear '_time1' 'tincr
>
> huh = subwrd(_tdef,4)
>
> ****************************************
>
> * 180-0mb Caoe
>
> ****************************************
>
>   i = 3
>
>   while ( i<maps )
>
> * Set up a few preliminary characteristics
>
> setmap(1)
>
> 'set rgb 16 0 100 254'
>
> 'set rgb 17 0 150 254'
>
> 'set rgb 18 0 200 254'
>
> 'set rgb 19 0 230 240'
>
> 'set rgb 20 0 230 160'
>
> 'set rgb 21 0 230 120'
>
> 'set rgb 21 0 230 80'
>
> 'set rgb 22 0 240 40'
>
> 'set rgb 23 0 250 0'
>
> 'set rgb 24 254 254 0'
>
> 'set rgb 25 254 225 0'
>
> 'set rgb 26 254 200 0'
>
> 'set rgb 27 254 175 0'
>
> 'set rgb 28 254 150 0'
>
> 'set rgb 29 230 125 0'
>
> 'set rgb 30 230 100 0'
>
> 'set rgb 31 220 75 30'
>
> 'set rgb 32 200 50 30'
>
> 'set rgb 33 180 25 30'
>
> 'set rgb 34 170 0 30'
>
> 'set rgb 35 180 0 50'
>
> 'set rgb 36 200 0 100'
>
> 'set rgb 37 254 0 150'
>
> 'set rgb 38 254 0 200'
>
> 'set rgb 39 254 0 254'
>
> 'set rgb 40 254 90 254'
>
> 'set rgb 41 255 150 255'
>
> 'set t 'i
>
> 'set gxout shaded'
>
> 'set csmooth on'
>
> 'set clevs  0 200 400 600 800 1000 1200 1400 1600 1800 2000 2200 2400 
> 2600 2800 3000 3200 3400 3600 3800 4000'
>
> 'set ccols  16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 
> 35 36 37 38 39 40 41'
>
> 'd cape180_0mb'
>
> 'cbarn'
>
> 'query time'
>
> time = subwrd(result,3)
>
> day = subwrd(result,6)
>
> fcsttime = substr(time,1,13)
>
> fcstday = substr(day,1,3)
>
> 'q dims'
>
> times  = sublin(result,5)
>
> hub = subwrd(times,6)
>
> 'set strsiz 0.12'
>
> 'set string 0 r 3 90' ; 'draw string 9.3 6 Cape in Joules/kg'
>
> 'set string 0 r 3 0' ; 'draw string 8.7 8.4 Valid: 'fcstday' 'fcsttime
>
> 'set string 0 l 3 0' ; 'draw string 0.1 0.1 Data: NOAA NCEP GFS 0.25 - 
> WWW.STORMCELL.BE'
>
> 'set string 2 r 3 0' ; 'draw string 8.7 0.1 GFS Run: 'huh
>
> * Draw Labels at the top of the page
>
> 'set string 0 r 11 0'
>
> 'set strsiz 0.12'
>
> 'set string 4 l 3 0' ; 'draw string 0.1 8.4 180-0mb above ground cape'
>
> 'gxprint bel_180cape'i'.png x1000 y844 -f overlay.png'
>
> i = i+1
>
> endwhile
>
> * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
>
> * END OF MAIN SCRIPT
>
> * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
>
> **
>
> Met vriendelijke groeten,
>
> Tim Van Damme
>
> +32 499 61 25 61
>
> tim at stormcell.be <mailto:tim at stormcell.be>
>
>
> _______________________________________________
> gradsusr mailing list
> gradsusr at gradsusr.org
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