[GRASSLIST:2644] RE: interpolation of area precipitation with s.surf.idw

[Alexander Fritz]

Hello I'm not very familar with postgre. Does that mean that I have to set
up an SQL database?


-----Original Message-----
From: daniel_victoria at yahoo.com [mailto:daniel_victoria at yahoo.com] 
Sent: Monday, February 16, 2004 1:09 PM
To: Alexander Fritz; 'GRASS_list'
Subject: Re: [GRASSLIST:2633] interpolation of area precipitation with
s.surf.idw


Hello,

I ran into the same problem last week, but using daily
data. Some stations did not have data for a specific
day and so forth, that means, depending on the day,
you have a different set of data. The problem is that,
you can't put zero for a station with no observation
since 0 rainfall is different from no data!!!

What I did is, using postgree, I get only the rainfall
that contain observations for one day, create a
separate sites file for that day and, interpolate and
then move to the next day. All this can be done using
a very simple bash script.

Of course, if there where a nodata value for sites, we
could use only one site file for all data, but I don't
know if there is such thing...




--- Alexander Fritz <Alex_Fritz at gmx.net> wrote:
> Dear GRASS users,
> 
> I'm trying to interpolate area precipitation maps
> with s.surf.idw in
> 5-minute-steps. I have rain gage data in 5-minute
> steps for several
> stations. Unfortunately not every station has
> recorded the whole time I'm
> interested in. Is it possible to fill these gaps
> with something like "no
> data" and/or is there an option for s.surf.idw which
> excludes the stations
> with no recorded data at this time step. Any
> suggestions? Thank you in
> advance for any help.
> 

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