[gradsusr] function
wendi harjupa
wendiharjupa at gmail.com
Thu Jul 19 07:42:53 EDT 2012
Dear Mr. Mike
Thank you very much for your idea,
I will try.
Best regards,
On Thu, Jul 19, 2012 at 5:16 PM, Michael Fiorino
<michael.fiorino at noaa.gov>wrote:
> hi Wendi, when I have problems like this, I break up the expressions and
> then take a look at each part, e.g.
>
> set t 1 2
> q dim # check the dim environment
> # do a 'd' after each define to see if it makes sense...
> # ref is a 3-D variable? x,y,t?
> r1=const(ref,10.0,-a)
> r2=ref*0.10
> p1=pow(r1,r2)
> p12=p1/200.0
> p22=const(ref,5.0/8.0,-a)
> R=pow(p12,p22)
> set t 1
> precip=sum(R,t=1,t=2)
> d precip
>
> ciao ciao Mike
>
>
> On 7/12/12 17:45 , Charles Seman wrote:
>
> Wendi,
> era
> From a GrADS perspective, the commands you list below look OK to me.
>
> Chuck
>
> On 07/12/2012 05:03 AM, wendi harjupa wrote:
>
> 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<mailto:charles.seman at noaa.gov> <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> <wendi at rslab.riko.shimane-u.ac.jp>
> > <mailto:wendi at rslab.riko.shimane-u.ac.jp <wendi at rslab.riko.shimane-u.ac.jp>
> <mailto:wendi at rslab.riko.shimane-u.ac.jp> <wendi at rslab.riko.shimane-u.ac.jp>>
> >
> >
> >
> > _______________________________________________
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> > gradsusr at gradsusr.org <mailto:gradsusr at gradsusr.org> <gradsusr at gradsusr.org>
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> >
>
> --
>
> Please note that Charles.Seman at noaa.gov
> <mailto:Charles.Seman at noaa.gov> <Charles.Seman at noaa.gov> should be considered my NOAA
> email address, not cjs at gfdl.noaa.gov <mailto:cjs at gfdl.noaa.gov> <cjs at gfdl.noaa.gov>.
>
> ********************************************************************
> Charles Seman Charles.Seman at noaa.gov <mailto:Charles.Seman at noaa.gov> <Charles.Seman at noaa.gov>
> U.S. Department of Commerce / NOAA / OAR
> Geophysical Fluid Dynamics Laboratory voice: (609)
> 452-6547 <tel:%28609%29%20452-6547> <%28609%29%20452-6547>
> 201 Forrestal Road fax: (609)
> 987-5063 <tel:%28609%29%20987-5063> <%28609%29%20987-5063>
> 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
> 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> <wendi at rslab.riko.shimane-u.ac.jp>
>
>
>
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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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