[gradsusr] function

[wendi harjupa]

Dear Mr Chuck

Thank you very much for your explanation,
I am sorry,  I want to ask you more...

If I have time series data is 4485, so can I make the script like this:

'set t 1 4485'
'R=pow((pow(10, ref/10))/200,5/8)'
'set t 1' ;* see discussion below
'd sum(R/15, t=1, t=4485)'

R=pow((pow(10, ref/10))/200,5/8) is formula to convert from Z (dBz) to R
(mm/hr)
to get value mm/hr, I have to use R/15.

Thank you very much.

Best regards,
wendi




On Thu, Jul 12, 2012 at 6:32 AM, Charles Seman <charles.seman at noaa.gov>wrote:

> Wendi,
>
> An idea; set the time dimension to span t=1,15 for the definition of "R":
>
> 'set t 1 15'
> 'R=pow((pow(10, ref/10))/200,5/8)'
> 'set t 1' ;* see discussion below
> 'd sum(R, t=1, t=15)'
>
> 'set t 1': for displaying sum; this is OK to go from time range to a
> single time level to do the sum (see "wild cards" discussion at
> http://grads.iges.org/grads/gadoc/variable.html#new); if left as 'set t
> 1 15', I think you would get 15 time levels with same "sum" result for
> the display command... you could try it both ways to see what you get...
>
> Hope this helps,
> Chuck
>
> On 07/06/2012 05:53 AM, wendi harjupa wrote:
> > Dear Grads users,
> >
> > I have problem,
> > below is  my descriptor file
> >
> > DSET /misc/home/wendi/data1/radar/kototabang/XDR/data/20040410/%d2%h2.dat
> > TITLE  RADAR
> > OPTIONS  TEMPLATE LITTLE_ENDIAN
> > UNDEF  -1000
> > XDEF    321 LINEAR    99.688120996    0.004492369
> > YDEF    321 LINEAR    -1.083708891    0.004522556
> > ZDEF    39  LINEAR   1.0 0.5
> > TDEF    15 LINEAR 21:00Z10apr2004  4mn
> > VARS    2
> > ref 39  99  Reflectivity(dBZ)
> > vel 39  99  Doppler Velocity(m/s)
> > ENDVARS
> >
> > As you see time is 15,
> >
> > I want to convert the ref (dbz) to Rain (mm/hr)
> > by using Z-R correlation formula, as below :
> >
> > 'pow((pow(10, R/10))/200,5/8)',
> >
> > Then I want to accumulate the rainrate for 1 hour,
> > I use this formula :
> >
> > 'sum(ref, t=1, t=15)'
> >
> > But I got strange result.
> >
> > Here my complete gs file,
> >
> > 'reinit'
> > 'set grads off'
> > 'set mproj latlon'
> > 'set mpdset hires'
> > 'set gxout shaded'
> > 'open RHI.ctl'
> > 'set lon 100 100.8'
> > 'set lat -0.45'
> > 'set Z 1 19'
> > 'set parea 1 7.5 2.8 8.3'
> > 'set clevs 0 50 100 150 200 250 300 350 400 450 500 550 600'
> > 'set ccols 9 14 4 11 5 13 3 10 7 12 8 2 6'
> > 'R=pow((pow(10, ref/10))/200,5/8)'
> > 'd sum(R, t=1, t=15)'
> > 'run /misc/home/wendi/grads-2.0.1/cbarn 0.7 0.7 7.9 5.2'
> > 'draw string  7.7 7.8 [dBz]'
> >
> > Would you help me, about this,
> > please let me know, which part I got wrong
> >
> > Thank you very much!
> >
> > Best regards,
> > wendi
> >
> >
> > --
> > -------------
> > Wendi Harjupa. ST
> > ShimaneUniversityGraduateSchool ofEngineering Sciences
> > Department ofElectronic ControlSystems
> > RemoteSensingLaboratory
> > s119447
> > Cellphone : +81-080-4268-6676
> > email : wendi at rslab.riko.shimane-u.ac.jp
> > <mailto:wendi at rslab.riko.shimane-u.ac.jp>
> >
> >
> >
> > _______________________________________________
> > gradsusr mailing list
> > gradsusr at gradsusr.org
> > http://gradsusr.org/mailman/listinfo/gradsusr
> >
>
> --
>
> Please note that Charles.Seman at noaa.gov should be considered my NOAA
> email address, not cjs at gfdl.noaa.gov.
>
> ********************************************************************
>   Charles Seman                                Charles.Seman at noaa.gov
>   U.S. Department of Commerce / NOAA / OAR
>   Geophysical Fluid Dynamics Laboratory         voice: (609) 452-6547
>   201 Forrestal Road                              fax: (609) 987-5063
>   Princeton, NJ  08540-6649            http://www.gfdl.noaa.gov/~cjs/
> ********************************************************************
>
> "The contents of this message are mine personally and do not reflect any
> official or unofficial position of the United States Federal Government,
> the United States Department of Commerce, or NOAA."
>
>
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>



-- 
-------------
Wendi Harjupa. ST
Shimane University Graduate School of Engineering Sciences
Department of Electronic Control Systems
Remote Sensing Laboratory
s119447
Cellphone : +81-080-4268-6676
email : wendi at rslab.riko.shimane-u.ac.jp
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