Roads

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 ROADS, dealing with the roads network.

The other tables are accessible via the left menu in the Input tables & parameters section.

_images/roads_banner.png

Table SOURCES_GEOM definition

Warning

  • In the list below, the columns noted with * are mandatory

  • This description is only valid for Noise_level_from_traffic and Road_Emission_from_Traffic WPS scripts. For the other WPS scripts, it is necessary to refer to the description of their input data

Note

In the list below, some columns are suffixed with the letters D, E and N. This correspond to Day (6-18h), Evening (18-22h) and Night (22-6h) periods. A column is expected for each of them.

  • THE_GEOM *

    • Description: Geometry of the roads (LINESTRING or MULTILINESTRING)

    • Type: Geometry

  • PK *

    • Description: An identifier (PRIMARY KEY)

    • Type: Integer

  • LV_D, LV_E, LV_N

    • Description: Hourly average light vehicle count

    • Type: Double

  • MV_D, MV_E, MV_N

    • Description: Hourly average medium heavy vehicles, delivery vans > 3.5 tons, buses, touring cars, etc. with two axles and twin tyre mounting on rear axle count

    • Type: Double

  • HGV_D, HGV_E, HGV_N

    • Description: Hourly average heavy duty vehicles, touring cars, buses, with three or more axles count

    • Type: Double

  • WAV_D, WAV_E, WAV_N

    • Description: Hourly average mopeds, tricycles or quads ≤ 50 cc count

    • Type: Double

  • WBV_D, WBV_E, WBV_N

    • Description: Hourly average motorcycles, tricycles or quads > 50 cc count

    • Type: Double

  • LV_SPD_D, LV_SPD_E, LV_SPD_N

    • Description: Hourly average light vehicle speed (km/h)

    • Type: Double

  • MV_SPD_D, MV_SPD_E, MV_SPD_N

    • Description: Hourly average medium heavy vehicles speed (km/h)

    • Type: Double

  • HGV_SPD_D, HGV_SPD_E, HGV_SPD_N

    • Description: Hourly average heavy duty vehicles speed (km/h)

    • Type: Double

  • WAV_SPD_D, WAV_SPD_E, WAV_SPD_N

    • Description: Hourly average mopeds, tricycles or quads ≤ 50 cc speed (km/h)

    • Type: Double

  • WBV_SPD_D, WBV_SPD_E, WBV_SPD_N

    • Description: Hourly average motorcycles, tricycles or quads > 50 cc speed (km/h)

    • Type: Double

  • PVMT
  • TS_STUD

    • Description: A limited period (Ts) (in months) over the year where a average proportion (pm) of light vehicles are equipped with studded tyres [0-12]

    • Type: Double

  • PM_STUD

    • Description: Average proportion of vehicles equipped with studded tyres during TS_STUD period [0-1]

    • Type: Double

  • JUNC_DIST

    • Description: Distance to the junction (in meters). When approaching less than 100m from a junction, it is advisable to subdivide the section into 10m pieces and calculate the distance from the centroid of this sub-section to the junction. This allows for a finer calculation.

    • Type: Double

  • JUNC_TYPE
    • Description: Integer defining the type of junction

      • 0 : None

      • 1 : A crossing with traffic lights

      • 2 : A roundabout

    • Type: Integer

  • SLOPE

    • Description: Slope (in %) of the road section. If the column is not filled in, the LINESTRING Z-values will be used to calculate the slope and the traffic direction (WAY column) will be force to 3 (bi-directional)

    • Type: Double

  • WAY
    • Description: Integer defining the way of the road section.

      • 1 = One way road section and the traffic goes in the same way that the slope definition you have used

      • 2 = One way road section and the traffic goes in the opposite way that the slope definition you have used

      • 3 = Bi-directional traffic flow, the flow is split into two components and correct half for uphill and half for downhill

    • Type: Integer

Table SOURCES_EMISSION definition

If you have custom time periods (ex. 8h00-9h00). You can place the traffic data into another table with the PERIOD column:

The script Road_Emission_from_Traffic can convert this traffic into the LW_ROADS table used for emission (dB for each octave bands) as an input for the Noise_level_from_source script.

Being able to see the noise emission of each roads is very useful for validation and verification of the input data before doing the propagation step.

  • IDSOURCE *

    • Description: An identifier linked to the primary key of the SOURCES_GEOM table.

    • Type: Integer

  • PERIOD *

    • Description: Identifier of the time. ex. 8h00-9h00

    • Type: String

  • LV

    • Description: Hourly average light vehicle count

    • Type: Double

  • MV

    • Description: Hourly average medium heavy vehicles, delivery vans > 3.5 tons, buses, touring cars, etc. with two axles and twin tyre mounting on rear axle count

    • Type: Double

  • HGV

    • Description: Hourly average heavy duty vehicles, touring cars, buses, with three or more axles count

    • Type: Double

  • WAV

    • Description: Hourly average mopeds, tricycles or quads ≤ 50 cc count

    • Type: Double

  • WBV

    • Description: Hourly average motorcycles, tricycles or quads > 50 cc count

    • Type: Double

  • LV_SPD

    • Description: Hourly average light vehicle speed (km/h)

    • Type: Double

  • MV_SPD

    • Description: Hourly average medium heavy vehicles speed (km/h)

    • Type: Double

  • HGV_SPD

    • Description: Hourly average heavy duty vehicles speed (km/h)

    • Type: Double

  • WAV_SPD

    • Description: Hourly average mopeds, tricycles or quads ≤ 50 cc speed (km/h)

    • Type: Double

  • WBV_SPD

    • Description: Hourly average motorcycles, tricycles or quads > 50 cc speed (km/h)

    • Type: Double

  • PVMT
  • TS_STUD

    • Description: A limited period (Ts) (in months) over the year where a average proportion (pm) of light vehicles are equipped with studded tyres [0-12]

    • Type: Double

  • PM_STUD

    • Description: Average proportion of vehicles equipped with studded tyres during TS_STUD period [0-1]

    • Type: Double

  • JUNC_DIST

    • Description: Distance to the junction (in meters). When approaching less than 100m from a junction, it is advisable to subdivide the section into 10m pieces and calculate the distance from the centroid of this sub-section to the junction. This allows for a finer calculation.

    • Type: Double

  • JUNC_TYPE
    • Description: Integer defining the type of junction

      • 0 : None

      • 1 : A crossing with traffic lights

      • 2 : A roundabout

    • Type: Integer

  • SLOPE

    • Description: Slope (in %) of the road section. If the column is not filled in, the LINESTRING Z-values will be used to calculate the slope and the traffic direction (WAY column) will be force to 3 (bi-directional)

    • Type: Double

  • WAY
    • Description: Integer defining the way of the road section.

      • 1 = One way road section and the traffic goes in the same way that the slope definition you have used

      • 2 = One way road section and the traffic goes in the opposite way that the slope definition you have used

      • 3 = Bi-directional traffic flow, the flow is split into two components and correct half for uphill and half for downhill

    • Type: Integer

Geometry modelling

In NoiseModelling, road geometries are used as a medium for road noise emission and propagation.

Emission

According to CNOSSOS-EU, emissions from road traffic should be 5cm above the ground.

You can create your own emmission layer or use the dedicated NoiseModelling block called Road_Emission_from_Traffic.groovy. In this script, the table ROADS is used to create the emission table LW_ROADS. As a consequence, whether or not your roads have a Z value in ROADS, NoiseModelling forces a Zsource value of 5cm in LW_ROADS.

_images/roads_emission.png

Warning

Whether you have Z values, the emission layer must be at an altitude of 5cm (above sea level) : Zsource = 0.05

Note

Z values in the input layer are only used to calculate the slope

Propagation

Whether you use your own sources or those calculated by NoiseModelling, the propagation step will consist of deducing the altitude from the DEM and adding the emission height (5cm).

_images/roads_propagation.png

Warning

  • Zobject = Zdem + Zsource = Zdem + 0.05

  • If there is no DEM, the altitude will be equal to 5cm (Zobject = 0.05)

  • If your ROADS table has accurate Z values, you are invited to enrich your DEM with this information before doing the propagation step. See DEM section for more information.

Note

Z values in the input layer are only used to calculate the slope. They are not used to force the DEM

In this context, the roads geometry can be in 2D or in 3D. In both cases, Z information is not taken into account during emission or propagation steps.