[GRASSLIST:5180] Re: Sound reflection and refraction

GRASS GRASS user
1

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@itc.it>
To: grasslist@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 GIS? I
> only mean 2D interpolation. I know 2D is a big compromise but it has to be
> done for my school assignment and at this level I do not intend to use a 3D
> 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.

Hi,

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

Cheers

Markus Neteler

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2

On Sat, Dec 07, 2002 at 09:23:02PM +0000, Miha STAUT wrote:

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.

... you may simply contact the authors :slight_smile:
I am sure that they provide the code to you.

[...]

>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

Their email address should be on the paper. If not, I can send it
to you.

Markus