The dBmap.net Noise Mapping Tool has been assessed using the international standard ISO 17534-4 titled:
“Acoustics – Software for the calculation of sound outdoors – Part 4: Recommendations for a quality assured implementation of the COMMISSION DIRECTIVE (EU) 2015/996 in software according to ISO 17534-1” (https://www.iso.org/standard/72115.html)
This assessment is specifically for the general method CNOSSOS-EU. For the general method ISO9613-2, the necessary document for assessment is ISO17534-3.
Test Cases (Scenarios)
Below are some test cases from the ISO 17534-4 standard that you can verify for yourself.
In the test cases, an obstacle is only included in the lateral path when it is intersecting the direct line of sight. However, this is not the case for the lateral path finder in dBmap.net, where all obstacles are included and lateral paths do not pass through them. Because of this difference some test cases have been omitted.
Scenario TC01 – Flat ground with homogeneous acoustic properties – Reflecting ground (G=0)
Click here to load “Scenario TC01” in the noise mapping tool
Notes: There is a difference of approx 0.03dB in the air absorption result.
Scenario TC02 – Flat ground with homogeneous acoustic properties – Mixed ground (G=0.5)
Click here to load “Scenario TC02” in the noise mapping tool
Notes: There is a difference of approx 0.03dB in the air absorption result.
Scenario TC03 – Flat ground with homogeneous acoustic properties – Porous ground (G=1)
Click here to load “Scenario TC03” in the noise mapping tool
Notes: There is a difference of approx 0.03dB in the air absorption result.
Scenario TC04 – Flat ground with spatially varying acoustic properties
Click here to load “Scenario TC04” in the noise mapping tool
Notes: There is a difference of approx 0.03dB in the air absorption result.
Scenario TC05 – Ground with spatially varying heights and acoustic properties
Click here to load “Scenario TC05” in the noise mapping tool
Notes: There is a difference of approx 0.03dB in the air absorption result.
Scenario TC06 – Reduced receiver height to include diffraction in some frequency bands
Click here to load “Scenario TC06” in the noise mapping tool
Notes: There is a difference of approx 0.03dB in the air absorption result.
Scenario TC07 – Flat ground with spatially varying acoustic properties and long barrier
Click here to load “Scenario TC07” in the noise mapping tool
Notes: There is a difference of approx 0.03dB in the air absorption result.
Scenario TC08 – Flat ground with spatially varying acoustic properties and short barrier
Click here to load “Scenario TC08” in the noise mapping tool
Notes: There is a difference of approx 0.03dB in the air absorption result.
Scenario TC09 – Ground with spatially varying heights and and acoustic properties and short barrier
Click here to load “Scenario TC09” in the noise mapping tool
Notes: There is a difference of approx 0.03dB in the air absorption result.
Scenario TC10 – Flat ground with homogeneous acoustic properties and cubic building – Receiver at low height
Click here to load “Scenario TC10” in the noise mapping tool
Scenario TC11 – Flat ground with homogeneous acoustic properties and cubic object – receiver at large height
Click here to load “Scenario TC11” in the noise mapping tool
Scenario TC12 – Flat ground with homogeneous acoustic properties and polygonal object – Receiver at low height
Click here to load “Scenario TC12” in the noise mapping tool
Scenario TC13 – Ground with spatially varying heights and acoustic properties and polygonal object
Click here to load “Scenario TC13” in the noise mapping tool
Notes: There is a difference of approx 0.03dB in the air absorption result.
Scenario TC14 – Flat ground with homogeneous acoustic properties and polygonal object – Receiver at large height
Click here to load “Scenario TC14” in the noise mapping tool
Scenario TC15 – Flat ground with homogeneous acoustic properties and four buildings
Click here to load “Scenario TC15” in the noise mapping tool
Notes: In the test cases, an obstacle is only considered for lateral paths when it is intersecting the direct line of sight. This is not the case for the lateral path finder in dBmap.net, where all obstacles are considered, and therefore the building has been disabled to match the behaviour in the test case.
Scenario TC16 – Reflecting barrier on ground with spatially varying heights and acoustic properties
Click here to load “Scenario TC16” in the noise mapping tool
Notes: There is a difference of approx 0.03dB in the air absorption result.
Scenario TC17 – Reflecting barrier on ground with spatially varying heights and acoustic properties – Reduced receiver height
Click here to load “Scenario TC17” in the noise mapping tool
Notes: There is a difference of approx 0.03dB in the air absorption result.
Scenario TC18 – Screening and reflecting barrier on ground with spatially varying heights and acoustic properties
Click here to load “Scenario TC18” in the noise mapping tool
Notes: There is a difference of approx 0.03dB in the air absorption result.
Scenario TC20 – Ground with spatially varying heights and acoustic properties
Click here to load “Scenario TC20” in the noise mapping tool
Notes: There is a difference of approx 0.03dB in the air absorption result.
Scenario TC21 – Building on ground with spatially varying heights and acoustic properties
Click here to load “Scenario TC21” in the noise mapping tool
Notes: There is a difference of approx 0.03dB in the air absorption result.
Scenario TC22 – Building with receiver backside on ground with spatially varying heights and acoustic properties
Click here to load “Scenario TC22” in the noise mapping tool
Notes: There is a difference of approx 0.03dB in the air absorption result.
Scenario TC23 – Two buildings behind an earth-berm on flat ground with homogeneous acoustic properties
Click here to load “Scenario TC23” in the noise mapping tool
Scenario TC24 – Two buildings behind an earth-berm on flat ground with homogeneous acoustic properties – receiver position modified
Click here to load “Scenario TC24” in the noise mapping tool
Scenario TC25 – Replacement of the earth-berm by a barrier
Click here to load “Scenario TC25” in the noise mapping tool
Scenario TC26 – Road source with influence of retrodiffraction
Click here to load “Scenario TC26” in the noise mapping tool
Permission to reproduce extracts from British Standards is granted by BSI Standards Limited (BSI). No other use of this material is permitted. British Standards can be obtained in PDF or hard copy formats from the BSI online shop: www.bsigroup.com/Shop
Last updated June 2026