Ground surfaces¶
NoiseModelling is a tool for producing noise maps. To do so, at different stages of the process, the application needs input data, respecting a strict formalism.
Below we describe the table GROUND
, dealing with the land use type, with an associated ground absorption coefficient (G).
The other tables are accessible via the left menu in the Input tables & parameters
section.

Table definition¶
Warning
In the list below, the two columns are mandatory
THE_GEOM
- Description: 2D geometry of the surfaces (
POLYGON
orMULTIPOLYGON
) - Type: Geometry
- Description: 2D geometry of the surfaces (
G
- Description: acoustic ground’s absorption (from
0
: very hard to1
: very soft - see table below) - Type: Double
- Description: acoustic ground’s absorption (from
Description | G |
---|---|
Very soft (snow or moss‐like) | 1 |
Soft forest floor (short, dense heather‐like or thick moss) | 1 |
Uncompacted, loose ground (turf, grass, loose soil) | 1 |
Normal uncompacted ground (forest floors, pasture field) | 1 |
Compacted field and gravel (compacted lawns, park area) | 0.7 |
Compacted dense ground (gravel road, car park) | 0.3 |
Hard surfaces (most normal asphalt, concrete) | 0 |
Very hard and dense surfaces (dense asphalt, concrete, water) | 0 |
Topology¶
At a given point, there can only be one value of G. Consequently, in the GROUND
table, the geometries must not overlap.