Averging Data by Keeping some region

[Suru Polade]

Thank you very much

it good logic to do with, i am working in IITM, Pune

thank once more

Suraj


On 12/6/07, Jayakrishnan PR <prjayakrishnan at gmail.com> wrote:
>
> *I have just now checked whether is it possible by using my uwind data. It
> is possible by first taking the area average of the whole region you
> specifies, and then substracting it with the region you want to exclude. I
> am here gives the codes which I used to do the same for your verification.
> You can go through this and make a gs file according to that and run.
>
> Simply
> define a=aave(value,lon=60,lon=100,lat=5,lat=35)
> define a2=aave(value,lon=80,lon=90,lat=15,lat=20)
> define s=a-a2
> d s,
>
> this will give what you are expecting, I think..... May I know where you
> are working..?
> with best wishes...
> *
>
>
>
>
> jkpr at jkpr-desktop:~$ gradsnc
>
> Grid Analysis and Display System (GrADS) Version 1.9b4
> Copyright (c) 1988-2005 by Brian Doty and IGES
> Center for Ocean-Land-Atmosphere Studies (COLA)
> Institute for Global Environment and Society (IGES)
> GrADS comes with ABSOLUTELY NO WARRANTY
> See file COPYRIGHT for more information
>
> Config: v1.9b4 32-bit little-endian readline sdf/xdf netcdf lats athena
> printim
>
> Issue 'q config' command for more information.
>
> Landscape mode? (no for portrait):
> GX Package Initialization: Size = 11 8.5
> ga-> open uwnd.2000.nc
> Scanning description file:  uwnd.2000.nc
> Open Error:  Unknown keyword in description file
>   --> The invalid description file record is:
>   --> CDF
>   The data file was not opened.
> ga-> sdfopen uwnd.2000.nc
> Scanning self-describing file:  uwnd.2000.nc
> SDF file uwnd.2000.nc is open as file 1
> LON set to 0 360
> LAT set to -90 90
> LEV set to 1000 1000
> Time values set: 2000:1:1:0 2000:1:1:0
> ga-> q file
> File 1 : mean daily NMC reanalysis (2000)
>   Descriptor: uwnd.2000.nc
>   Binary: uwnd.2000.nc
>   Type = Gridded
>   Xsize = 144  Ysize = 73  Zsize = 17  Tsize = 366
>   Number of Variables = 1
>     uwnd 17 -999 mean Daily U-wind
> ga-> set lat 5 35
> LAT set to 5 35
> ga-> set lon 60 100
> LON set to 60 100
> ga-> d u
> Syntax Error:  Invalid Operand
>   'u' not a variable or function name
>   Error ocurred at column 1
> DISPLAY error:  Invalid expression
>   Expression = u
> ga-> d uwnd
> Contouring: -8 to 8 interval 2
> ga-> d uwnd
> Contouring: -8 to 8 interval 2
> ga-> d uwnd
> Contouring: -8 to 8 interval 2
> ga-> define a=aave(uwnd,lon=60,lon=100,lat=5,lat=35)
> Define memory allocation size = 4 bytes
> ga-> c
> ga-> d a
> Result value = -2.72067
> ga-> define a2=aave(uwnd,lon=80,lon=90,lat=15,lat=20)
> Define memory allocation size = 4 bytes
> ga-> d a2
> Result value = -4.23691
> ga-> define s=a-a2
> Define memory allocation size = 4 bytes
> ga-> d s
> Result value = 1.51624
> ga->
>
>
>
> On Dec 6, 2007 12:04 PM, Suru Polade < gr.suru at gmail.com> wrote:
>
> >  Thank you
> >
> >                 very much for your help
> >
> >
> >
> > actually i want to take area average for region lat 5 35 and lon 60 100,
> > by excluding region lat 15 20 and lon 80 90 , can you check this
> >
> >
> > thank once more
> >
> >
> >
> >
> >
> >
> > Suraj
> >
> >
> > On 12/6/07, Jayakrishnan PR <prjayakrishnan at gmail.com> wrote:
> > >
> > > May be you are looking for area averaging of the value in a paticular
> > > location. You can do this like the following.
> > >     define a=aave(value,lon=60,lon=110,lat=-5,lat=35)
> > >     d a
> > >     This will take the area average of the region between lat -5 35
> > > and lon 60 110.
> > >        Hope it helps.....
> > >
> > >
> > > On Dec 6, 2007 11:22 AM, Suru Polade <gr.suru at gmail.com> wrote:
> > >
> > > >  Dear
> > > >
> > > >       Grads user
> > > >
> > > >                        I have tropospheric ozone data over the
> > > > Indian region and want to average it over the region by keeping central
> > > > India, i know how to average but not getting how to keep some region, can
> > > > some one help e regarding this, thank in advance
> > > >
> > > >
> > > >
> > > >
> > > >
> > > > Suraj
> > > >
> > > >
> > > >
> > > >
> > > >
> > >
> > >
> > >
> > > --
> > > ***********************************************
> > > Jayakrishnan.P.R
> > > Junior Research Fellow
> > > Department of Atmospheric Sciences
> > > Cochin University of Science And Technology (CUSAT), Cochin-16
> > > Kerala, India.
> > > Mob: 09895417565
> > >
> > > ***********************************************
> >
> >
> >
> >
>
>
>
> --
> ***********************************************
> Jayakrishnan.P.R
> Junior Research Fellow
> Department of Atmospheric Sciences
> Cochin University of Science And Technology (CUSAT), Cochin-16
> Kerala, India.
> Mob: 09895417565
>
> ***********************************************
>
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