Ground Acoustic

The table ground_acoustic merges the vegetation, water, and impervious tables built by GeoClimate. This table contains an absorption coefficient (g column) used to estimate the acoustic energy losses upon reflection for a specific surface.

Each surface is unique, and potential overlaps are eliminated by applying a priority to the input layers. The priorities and the mapping between the types of input geometries (vegetation, water, etc.) are described in a JSON file.

To compute the ground_acoustic table, the following parameters must be defined in the workflow configuration file:

"parameters": {
  "noise_indicators": { "ground_acoustic" : true }
}

Schema of the ground_acoustic table:

Name	Type	Constraints	Definition
the_geom	POLYGON	X Y dimension	Geometry
id_ground	SERIAL	not null	Identifier of the ground surface
g	FLOAT		Acoustic absorption coefficient
type	INTEGER		Value distinguishing the surface type from input layers
layer	VARCHAR		Name of the input layer (e.g., vegetation, water, impervious)

---

GeoClimate - documentation 2020 - 2025 - This work is licensed under a Creative Commons Attribution-ShareAlike 4.0 International License.