{"id":1150,"date":"2026-06-11T12:15:08","date_gmt":"2026-06-11T11:15:08","guid":{"rendered":"https:\/\/noisetools.net\/users\/?page_id=1150"},"modified":"2026-08-03T15:37:37","modified_gmt":"2026-08-03T14:37:37","slug":"iso-17534-4","status":"publish","type":"page","link":"https:\/\/noisetools.net\/users\/iso-17534-4\/","title":{"rendered":"ISO 17534-4 Test Cases for CNOSSOS-EU"},"content":{"rendered":"\n

The dBmap.net Noise Mapping Tool has been assessed using the international standard ISO 17534-4 titled:<\/p>\n\n\n\n

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“Acoustics \u2013 Software for the calculation of sound outdoors \u2013 Part 4: Recommendations for a quality assured implementation of the COMMISSION DIRECTIVE (EU) 2015\/996 in software according to ISO 17534-1”<\/strong> (https:\/\/www.iso.org\/standard\/72115.html<\/a>)<\/p>\n<\/blockquote>\n\n\n\n

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This assessment is specifically for the general method CNOSSOS-EU. For the general method ISO9613-2, the necessary document for assessment is ISO17534-3<\/a>.<\/p>\n<\/div><\/div>\n\n\n\n

Test Cases (Scenarios)<\/h2>\n\n\n\n

Below are some test cases from the ISO 17534-4 standard that you can verify for yourself.<\/p>\n\n\n\n

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.<\/p>\n\n\n\n

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Scenario TC01 \u2013 Flat ground with homogeneous acoustic properties \u2013 Reflecting ground (G=0)<\/h3>\n\n\n
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\"\"<\/figure>\n<\/div>\n\n\n

Click here to load “Scenario TC01” in the noise mapping tool<\/a><\/p>\n\n\n

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Results table for Scenario TC01<\/em><\/figcaption><\/figure>\n<\/div>\n\n\n

Notes: There is a difference of approx 0.03dB in the air absorption result.<\/em><\/p>\n\n\n\n

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Scenario TC02 \u2013 Flat ground with homogeneous acoustic properties \u2013 Mixed ground (G=0.5)<\/h3>\n\n\n
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\"\"<\/figure>\n<\/div>\n\n\n

Click here to load “Scenario TC02” in the noise mapping tool<\/a><\/p>\n\n\n

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Results table for Scenario TC02<\/em><\/figcaption><\/figure>\n<\/div>\n\n\n

Notes: There is a difference of approx 0.03dB in the air absorption result.<\/em><\/p>\n\n\n\n

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Scenario TC03 \u2013 Flat ground with homogeneous acoustic properties \u2013 Porous ground (G=1)<\/h3>\n\n\n
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\"\"<\/figure>\n<\/div>\n\n\n

Click here to load “Scenario TC03” in the noise mapping tool<\/a><\/p>\n\n\n

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Results table for Scenario TC0<\/em>3<\/figcaption><\/figure>\n<\/div>\n\n\n

Notes: There is a difference of approx 0.03dB in the air absorption result.<\/em><\/p>\n\n\n\n

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Scenario TC04 \u2013 Flat ground with spatially varying acoustic properties<\/h3>\n\n\n
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\"\"<\/figure>\n<\/div>\n\n\n

Click here to load “Scenario TC04” in the noise mapping tool<\/a><\/p>\n\n\n

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Results table for Scenario TC0<\/em>4<\/figcaption><\/figure>\n<\/div>\n\n\n

Notes: There is a difference of approx 0.03dB in the air absorption result.<\/em><\/p>\n\n\n\n

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Scenario TC05 \u2013 Ground with spatially varying heights and acoustic properties<\/h3>\n\n\n
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\"\"<\/figure>\n<\/div>\n\n\n

Click here to load “Scenario TC05” in the noise mapping tool<\/a><\/p>\n\n\n

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Results table for Scenario TC0<\/em>5<\/figcaption><\/figure>\n<\/div>\n\n\n

Notes: There is a difference of approx 0.03dB in the air absorption result.<\/em><\/p>\n\n\n\n

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Scenario TC06 \u2013 Reduced receiver height to include diffraction in some frequency bands<\/h3>\n\n\n
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\"\"<\/figure>\n<\/div>\n\n\n

Click here to load “Scenario TC06” in the noise mapping tool<\/a><\/p>\n\n\n

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Results table for Scenario TC0<\/em>6<\/figcaption><\/figure>\n<\/div>\n\n\n

Notes: There is a difference of approx 0.03dB in the air absorption result.<\/em><\/p>\n\n\n\n

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Scenario TC07 \u2013 Flat ground with spatially varying acoustic properties and long barrier<\/h3>\n\n\n
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\"\"<\/figure>\n<\/div>\n\n\n

Click here to load “Scenario TC07” in the noise mapping tool<\/a><\/p>\n\n\n

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Results table for Scenario TC0<\/em>7<\/figcaption><\/figure>\n<\/div>\n\n\n

Notes: There is a difference of approx 0.03dB in the air absorption result.<\/em><\/p>\n\n\n\n

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Scenario TC08 \u2013 Flat ground with spatially varying acoustic properties and short barrier<\/h3>\n\n\n
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\"\"<\/figure>\n<\/div>\n\n\n

Click here to load “Scenario TC08” in the noise mapping tool<\/a><\/p>\n\n\n

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Results table for Scenario TC0<\/em>8<\/figcaption><\/figure>\n<\/div>\n\n\n

Notes: There is a difference of approx 0.03dB in the air absorption result.<\/em><\/p>\n\n\n\n

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Scenario TC09 \u2013 Ground with spatially varying heights and and acoustic properties and short barrier<\/h3>\n\n\n
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\"\"<\/figure>\n<\/div>\n\n\n

Click here to load “Scenario TC09” in the noise mapping tool<\/a><\/p>\n\n\n

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Results table for Scenario TC09<\/em><\/figcaption><\/figure>\n<\/div>\n\n\n

Notes: There is a difference of approx 0.03dB in the air absorption result.<\/em><\/p>\n\n\n\n

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Scenario TC10 \u2013 Flat ground with homogeneous acoustic properties and cubic building \u2013 Receiver at low height<\/h3>\n\n\n
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\"\"<\/figure>\n<\/div>\n\n\n

Click here to load “Scenario TC10” in the noise mapping tool<\/a><\/p>\n\n\n

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Results table for Scenario TC10<\/em><\/figcaption><\/figure>\n<\/div>\n\n\n
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Scenario TC11 \u2013 Flat ground with homogeneous acoustic properties and cubic object \u2013 receiver at large height<\/h3>\n\n\n
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\"\"<\/figure>\n<\/div>\n\n\n

Click here to load “Scenario TC11” in the noise mapping tool<\/a><\/p>\n\n\n

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Results table for Scenario TC11<\/em><\/figcaption><\/figure>\n<\/div>\n\n\n
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Scenario TC12 \u2013 Flat ground with homogeneous acoustic properties and polygonal object \u2013 Receiver at low height<\/h3>\n\n\n
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\"\"<\/figure>\n<\/div>\n\n\n

Click here to load “Scenario TC12” in the noise mapping tool<\/a><\/p>\n\n\n

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Results table for Scenario TC<\/em>12<\/figcaption><\/figure>\n<\/div>\n\n\n
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Scenario TC13 \u2013 Ground with spatially varying heights and acoustic properties and polygonal object<\/h3>\n\n\n
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\"\"<\/figure>\n<\/div>\n\n\n

Click here to load “Scenario TC13” in the noise mapping tool<\/a><\/p>\n\n\n

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Results table for Scenario TC<\/em>13<\/figcaption><\/figure>\n<\/div>\n\n\n

Notes: There is a difference of approx 0.03dB in the air absorption result.<\/em><\/p>\n\n\n\n

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Scenario TC14 \u2013 Flat ground with homogeneous acoustic properties and polygonal object \u2013 Receiver at large height<\/h3>\n\n\n
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\"\"<\/figure>\n<\/div>\n\n\n

Click here to load “Scenario TC14” in the noise mapping tool<\/a><\/p>\n\n\n

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Results table for Scenario TC14<\/em><\/figcaption><\/figure>\n<\/div>\n\n\n
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Scenario TC15 \u2013 Flat ground with homogeneous acoustic properties and four buildings<\/h3>\n\n\n
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\"\"<\/figure>\n<\/div>\n\n\n

Click here to load “Scenario TC15” in the noise mapping tool<\/a><\/p>\n\n\n

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Results table for Scenario TC15<\/em><\/figcaption><\/figure>\n<\/div>\n\n\n

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.<\/em><\/p>\n\n\n\n

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Scenario TC16 \u2013 Reflecting barrier on ground with spatially varying heights and acoustic properties<\/h3>\n\n\n
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\"\"<\/figure>\n<\/div>\n\n\n

Click here to load “Scenario TC16” in the noise mapping tool<\/a><\/p>\n\n\n

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Results table for Scenario TC16<\/em><\/figcaption><\/figure>\n<\/div>\n\n\n

Notes: There is a difference of approx 0.03dB in the air absorption result.<\/em><\/p>\n\n\n\n

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Scenario TC17 \u2013 Reflecting barrier on ground with spatially varying heights and acoustic properties \u2013 Reduced receiver height<\/h3>\n\n\n
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\"\"<\/figure>\n<\/div>\n\n\n

Click here to load “Scenario TC17” in the noise mapping tool<\/a><\/p>\n\n\n

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Results table for Scenario TC17<\/em><\/figcaption><\/figure>\n<\/div>\n\n\n

Notes: There is a difference of approx 0.03dB in the air absorption result.<\/em><\/p>\n\n\n\n

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Scenario TC18 \u2013 Screening and reflecting barrier on ground with spatially varying heights and acoustic properties<\/h3>\n\n\n
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\"\"<\/figure>\n<\/div>\n\n\n

Click here to load “Scenario TC18” in the noise mapping tool<\/a><\/p>\n\n\n

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Results table for Scenario TC18<\/em><\/figcaption><\/figure>\n<\/div>\n\n\n

Notes: There is a difference of approx 0.03dB in the air absorption result.<\/em><\/p>\n\n\n\n

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Scenario TC20 \u2013 Ground with spatially varying heights and acoustic properties<\/h3>\n\n\n
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\"\"<\/figure>\n<\/div>\n\n\n

Click here to load “Scenario TC20” in the noise mapping tool<\/a><\/p>\n\n\n

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Results table for Scenario TC20<\/em><\/figcaption><\/figure>\n<\/div>\n\n\n

Notes: There is a difference of approx 0.03dB in the air absorption result.<\/em><\/p>\n\n\n\n

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Scenario TC21 \u2013 Building on ground with spatially varying heights and acoustic properties<\/h3>\n\n\n
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\"\"<\/figure>\n<\/div>\n\n\n

Click here to load “Scenario TC21” in the noise mapping tool<\/a><\/p>\n\n\n

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\"\"
Results table for Scenario TC21<\/em><\/figcaption><\/figure>\n<\/div>\n\n\n

Notes: There is a difference of approx 0.03dB in the air absorption result.<\/em><\/p>\n\n\n\n

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Scenario TC22 \u2013 Building with receiver backside on ground with spatially varying heights and acoustic properties<\/h3>\n\n\n
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\"\"<\/figure>\n<\/div>\n\n\n

Click here to load “Scenario TC22” in the noise mapping tool<\/a><\/p>\n\n\n

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Results table for Scenario TC22<\/em><\/figcaption><\/figure>\n<\/div>\n\n\n

Notes: There is a difference of approx 0.03dB in the air absorption result.<\/em><\/p>\n\n\n\n

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Scenario TC23 \u2013 Two buildings behind an earth-berm on flat ground with homogeneous acoustic properties<\/h3>\n\n\n
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\"\"<\/figure>\n<\/div>\n\n\n

Click here to load “Scenario TC23” in the noise mapping tool<\/a><\/p>\n\n\n

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Results table for Scenario TC<\/em>23<\/figcaption><\/figure>\n<\/div>\n\n\n
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Scenario TC24 \u2013 Two buildings behind an earth-berm on flat ground with homogeneous acoustic properties \u2013 receiver position modified<\/h3>\n\n\n
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\"\"<\/figure>\n<\/div>\n\n\n

Click here to load “Scenario TC24” in the noise mapping tool<\/a><\/p>\n\n\n

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Results table for Scenario TC<\/em>24<\/figcaption><\/figure>\n<\/div>\n\n\n
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Scenario TC25 \u2013 Replacement of the earth-berm by a barrier<\/h3>\n\n\n
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\"\"<\/figure>\n<\/div>\n\n\n

Click here to load “Scenario TC25” in the noise mapping tool<\/a><\/p>\n\n\n

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Results table for Scenario TC25<\/em><\/figcaption><\/figure>\n<\/div>\n\n\n
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Scenario TC26 \u2013 Road source with influence of retrodiffraction<\/h3>\n\n\n
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\"\"<\/figure>\n<\/div>\n\n\n

Click here to load “Scenario TC26” in the noise mapping tool<\/a><\/p>\n\n\n

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Results table for Scenario TC<\/em>26<\/figcaption><\/figure>\n<\/div>\n\n\n
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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<\/a><\/em><\/p>\n\n\n\n

Last updated June 202<\/em>6<\/p>\n\n\n\n

<\/p>\n","protected":false},"excerpt":{"rendered":"

The dBmap.net Noise Mapping Tool has been assessed using the international standard ISO 17534-4 titled: “Acoustics \u2013 Software for the calculation of sound outdoors \u2013 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. … ISO 17534-4 Test Cases for CNOSSOS-EU<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"document.php","meta":{"pmpro_default_level":"","inline_featured_image":false,"footnotes":""},"class_list":["post-1150","page","type-page","status-publish","hentry","pmpro-has-access"],"lang":"en","translations":{"en":1150},"pll_sync_post":{},"_links":{"self":[{"href":"https:\/\/noisetools.net\/users\/wp-json\/wp\/v2\/pages\/1150","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/noisetools.net\/users\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/noisetools.net\/users\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/noisetools.net\/users\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/noisetools.net\/users\/wp-json\/wp\/v2\/comments?post=1150"}],"version-history":[{"count":8,"href":"https:\/\/noisetools.net\/users\/wp-json\/wp\/v2\/pages\/1150\/revisions"}],"predecessor-version":[{"id":1179,"href":"https:\/\/noisetools.net\/users\/wp-json\/wp\/v2\/pages\/1150\/revisions\/1179"}],"wp:attachment":[{"href":"https:\/\/noisetools.net\/users\/wp-json\/wp\/v2\/media?parent=1150"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}