Exposition ON facade

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Exposition ON facade

Rodolphe
This post was updated on .
Hi,

BR_TriGrid3D can calculate noise propagation in 3D. So, is it possible to obtain not only the noise map on the ground but also ON the different facades of the buildings?

Thanks.
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Re: Exposition ON facade

Nicolas F.
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Hi,

You first have to compute the coordinate list of receivers at 1m of each facade. You will have a table like this:

```sql

CREATE TABLE RECEIVERS( GID SERIAL,THE_GEOM POINT, BUILDING_ID INT)

```

The function [br_ptgrid3d](https://github.com/irstv/noisemap/wiki/3-SQL-functions#br_ptgrid3d) compute the sound propagation at specified receiver point. This function does not generate a noise map but in generate a noise level for each receiver point.

Using this you can accurately compute the noise exposition of the population.

It is technically possible to [generate a vertical noise map](https://github.com/irstv/noisemap/wiki/8-Vertical-noise-map) on each building's walls then [export it into a PLY 3d format](https://github.com/irstv/noisemap/wiki/6-dem-noisemap)]. However there is no demonstration script at the moment.

Regards,

-- 
Nicolas Fortin IRSTV FR CNRS 2488 GIS http://orbisgis.org Spatial DB http://h2gis.org Noise http://noisemap.orbisgis.org

Le 2015-02-19 13:15, Rodolphe [via OrbisGIS] a écrit :

BR_TriGrid3D can calculate noise propagation in 3D. So, is it possible to obtain not only the noise map on the ground but also ON the different facades of the buildings?


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Re: Exposition ON facade

Nicolas F.
Administrator
In reply to this post by Rodolphe

Sorry forget to convert..

Hi,
You first have to compute the coordinate list of receivers at 1m of each facade. You will have a table like this:

CREATE TABLE RECEIVERS( GID SERIAL,THE_GEOM POINT, BUILDING_ID INT)

The function br_ptgrid3d compute the sound propagation at specified receiver point. This function does not generate a noise map but in generate a noise level for each receiver point.
Using this you can accurately compute the noise exposition of the population.
It is technically possible to generate a vertical noise map on each building’s walls then export it into a PLY 3d format]. However there is no demonstration script at the moment.
Regards,

‚Äč
-- 
Nicolas Fortin IRSTV FR CNRS 2488 GIS http://orbisgis.org Spatial DB http://h2gis.org Noise http://noisemap.orbisgis.org

Le 2015-02-19 13:15, Rodolphe [via OrbisGIS] a écrit :

BR_TriGrid3D can calculate noise propagation in 3D. So, is it possible to obtain not only the noise map on the ground but also ON the different facades of the buildings?


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