station map

[sh zhou]

Dear, M. Mahakur,

Thank you for your time and replay.
Yes, as you said, the resolution I set is too high, and I made a mistake at
the same time when set the area location, that the stations' location are
out of " background grid".
The radii of influence should be set between "0" and "50", my Grads version
is 1.8sl11, maybe in other versions are different values.
Now, I had set background grid data like this:
###
xdef  350 linear  104.61  0.0450
ydef  250 linear   21.98  0.0450
###
then the display seems much better now, but there are so many small lines
appeared, why does those small lines appear?
In this web page " http://www.iges.org/grads/gadoc/users.html" ( my manual
), I haven't found the reason, If you know, could you tell me?
By the way, in my first step, when display station data, the background is
the whole word, is that default display?

Thank you for your time.

Sincerely.

2009/6/1 M.Mahakur <mmahakur at tropmet.res.in>

> Hello,
>
> How many stations do you have to inerpolate to such a hi resolution map
> (0.05 x 0.01)?
> Try with several scan radii, starting from a bigger for example (I guess
> there is limit
> to nos. of radii and minimum value of radii, see if 0.01 is allowed,
> although I have
> written!!):
>
> qq=oacres(r,rain.2, 5,4,2,1,0.5,0.3
> ,0.1,0.08,0.06,0.05,0.04,0.03,0.02,0.01)
>
> Default radii are 10,7,4,2,1
>
> http://www.iges.org/grads/gadoc/gradfuncoacres.html
>
> --
> M. Mahakur
>
> ---------- Original Message -----------
> From: sh zhou <sh.maeam at GMAIL.COM>
> To: GRADSUSR at LIST.CINECA.IT
> Sent: Mon, 1 Jun 2009 20:49:19 +0800
> Subject: station map
>
> > Dear All,
> >
> > I want to draw a station map,  firstly, I created a binary file, and
> wrote a
> > "ctl" file as following:
> > ###
> > dset st_data.dat
> > title station data
> > dtype station
> > stnmap station_data.map
> > undef -999.9
> > tdef 1 linear 24May2008 7dy
> > vars 1
> > rain 0 99 rain data
> > endvars
> > ###
> > but the picture's background is the whole world( there is a picture in
> > attachment), and stations values displayed in a small area,  when I added
> > "xdef,yedf,zdef" like this:
> >
> > ###
> > ...
> > undef -999.9
> > xdef 100 linear 100.0 0.05
> > ydef 100 linear 20.0 0.01
> > zdef 1 linear 1000.0
> > tdef 1 linear 24May2008 7dy
> > ...
> > ###
> > however, the background didn't change, Does "xdef" and "ydef"'s range
>  set
> > by default as following?
> > ###
> > ga-> open station.ctl
> > Scanning description file:  station.ctl
> > Data file st_data.dat is open as file 1
> > LON set to 0 360
> > LAT set to -90 90
> > LEV set to 500 500
> > Time values set: 2008:5:24:0 2008:5:24:0
> > ga-> q file
> > ###
> >
> > Secondly, I created a background grid file, and I used it to display
> station
> > values, but I got a error when used command " oacres", the following
> steps
> > is what I did.
> >
> > ###
> > ga-> open grid.ctl
> > Scanning description file:  grid.ctl
> > Data file grid.dat is open as file 1
> > LON set to 99 106.45
> > LAT set to 19 20.49
> > LEV set to 1000 1000
> > Time values set: 2008:5:24:0 2008:5:24:0
> > ga-> open station.ctl
> > Scanning description file:  station.ctl
> > Data file st_data.dat is open as file 2
> > ga-> define qq=oacres(r,rain.2)
> > Warning from OACRES:  Less than two stations
> >     Grid will be all missing values
> > Define memory allocation size = 90000 bytes
> > ga-> d qq
> > Cannot contour grid - all undefined values
> > ###
> > according to the error message:"Warning from OACRES:  Less than two
> stations"
> > , and it occupied so much memory  , it seems there are some mistakes in
> the
> > first step, am I right? if yes, could you tell me what should I do ? and
> is
> > there any problem in my  steps?
> >
> > Thank you.
> >
> > Sincerely.
> >
> > --
> >
> > Shenghui                Student
> >
> > HuNan University .  China
> ------- End of Original Message -------
>



--

Shenghui                 Student
Major:                    Physics
HuNan University         China
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