Isolines in station data

[M.Mahakur]

Hello,

You do not need the model data file. I guess the cookbook example is for a different
purpose, i.e. to interpolate the model data at the station locations. What you need is
simply a dummy ctl with out any data file (i.e. no_data_file.bin does not exit). The
'options template' will take care of it and grdval will have undef evrywhere. Then try:

open your_stn_data.ctl
open dummy.ctl

set gxout shaded/contour
d oacres(grdval.2,stn_dat, r1, r2 ...) where the radii r1,r2,... etc you can choose.
see: http://www.iges.org/grads/gadoc/gradfuncoacres.html

(content of dummy.ctl)
dset ^no_data_file.bin
options template
undef -999
title nothing
xdef 181 linear -90 1.0
ydef 360 linear 0.0 1.0
zdef 1 linear 1 1
tdef 1 linear 08MAY2009 1dy
vars 1
grdval 0 99 dumy values
endvars

You can change the xdef and ydef as per your domain and resolution requirements..

with regards,

--
M. Mahakur
Forecasting Research Division
INDIAN INSTITUTE OF TROPICAL METEOROLOGY
(Ministry of Earth Sciences, Govt. of India)
Dr. Homi Bhabha Road, NCL Post, Pashan
PUNE - 411 008, INDIA


---------- Original Message -----------
From: Piotr Djaków <pdjakow at GMAIL.COM>
To: GRADSUSR at LIST.CINECA.IT
Sent: Fri, 8 May 2009 10:51:01 +0200
Subject: Re: Isolines in station data

> 2009/5/8 M.Mahakur <mmahakur at tropmet.res.in>:
> > Hello,
> >
> > You can do this after converting to gridded data using in-built 'oacres' function.
> >
> > Regards,
> >
> > Mahakur
> >
>
> I've found this method in
>
http://cookbooks.opengrads.org/index.php?title=Recipe-013:_Gridding_and_Plotting_Station_Data
> But i think i must have some model data for my area - is this correct?
>
> Regards
> Piotr
------- End of Original Message -------