[GRASSLIST:5180] Re: Sound reflection and refraction

Miha STAUT mihastaut at hotmail.com
Sat Dec 7 16:23:02 EST 2002

Hi all,

Markus thanks for the tip about r.noise. The problem is, there are two 
difficulties about the proposed command besides that I do not have it and I 
searched allover the internet withot success. It is that I do not have the 
measurments of sound loudness which are required for the input. The paper 
helped even without the measurments at least I know the procedure to follow 
and I can try to compute the estimates from some other data (traffic 
intensity, slope of the road, pavement, ...).

The other problem is I intend to use other sources of noise besides traffic 
(concerts and performances, bars, church bells...) which all have much lower 
Leq than street traffic but can be equally disturbing. Is there any other 
way than questionary survey to incorporate them in a noise map?

Probably I will have to perform this survey as I think there is no beter way 
to estimate the degree of disturbance than asking people.

Thanks again, Miha Staut

>From: Markus Neteler <neteler at itc.it>
>To: grasslist at baylor.edu
>Subject: [GRASSLIST:5130] Re: Sound reflection and refraction
>Date: Mon, 2 Dec 2002 13:39:54 +0100
>On Sat, Nov 30, 2002 at 08:26:11PM +0000, Miha STAUT wrote:
> > Hi all,
> >
> > Has anybody ever tried to interpolate sound (==> noise) in a general 
> > only mean 2D interpolation. I know 2D is a big compromise but it has to 
> > done for my school assignment and at this level I do not intend to use a 
> > technique.
> >
> > How would you treat the spread of a signal from a source r.cost is not a
> > very good solution because of the refraction (picture the emission and
> > imission points on the opposite sides of a building).
> >
> > What about the reflection from objects?
> >
> > Ideas and comments are welcome.
>you may read this paper:
>Geomatics WorkBooks No 2 - 2001:
>  Biagi L., Brovelli M.A., Scuratti M.
>  Enviromental noise modeling within an open source GIS
>  http://geomatica.ing.unico.it/cgi-bin/workbooks.cgi?pag=abs2&ind=2
>  Markus Neteler

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