ISO 9613-2 Attenuation Reference
Return the principal outdoor sound-propagation attenuation terms and method cautions.
Description
The ISO 9613-2 engineering method combines geometrical divergence, atmospheric absorption, ground effect, barrier, and applicable miscellaneous attenuation terms.
The ISO 9613-2 engineering method combines geometrical divergence, atmospheric absorption, ground effect, barrier, and applicable miscellaneous attenuation terms. This reference explains the selected concept and the evidence needed to interpret it.1
The returned values include Source, Statement, Topic. The How section below explains the calculation, input rules and interpretation.
When to use ISO 9613-2 Attenuation Reference
Use ISO 9613-2 Attenuation Reference when you need to evaluate the supplied records under the calculation and evidence rules below. Terrain, weather, source directivity, reflections, and edition-specific rules must be modeled explicitly; the five term names are not a complete prediction. This is an introductory excerpt, not the complete standard, a current compliance check or a project-specific calculation.
Choose the measured quantities, units, weighting and measurement basis before entering values. For a reference, select the exact topic. For a catalog lookup, prepare complete source-backed records; for a screen, select an applicable caller limit.
How to use ISO 9613-2 Attenuation Reference and understand its results
- Choose the measured quantities, units, weighting and measurement basis before entering values. For a reference, select the exact topic. For a catalog lookup, prepare complete source-backed records; for a screen, select an applicable caller limit.
- Enter topic using the field table and calculation rules, then run the tool.
- Read source, statement, topic. The explanation below defines the units, signs, ordering and any flags or placeholder values.
- If the tool reports an input issue, correct the values and run it again. Apply the stated assumptions when interpreting a successfully returned result.
| Input field | Meaning | Value type; see rules below | Requirement |
|---|---|---|---|
| topic | Reference topic to return. | string; one of "terms", "meteorology", "caution" | Required |
Choose one of the exact topic values in the table. The tool indexes a fixed, locally embedded reference entry and returns its source label, statement and unchanged topic. It does not fetch the source or update the wording. Topic meanings and all returned entries are shown below.
| Selection | Returned reference entry |
|---|---|
| terms | source: ISO 9613-2; statement: The ISO 9613-2 engineering method combines geometrical divergence, atmospheric absorption, ground effect, barrier, and applicable miscellaneous attenuation terms.; topic: terms |
| meteorology | source: ISO 9613-2; statement: The method uses specified favorable-propagation assumptions and a separate approach for long-term average level under its stated scope.; topic: meteorology |
| caution | source: ISO 9613-2; statement: Terrain, weather, source directivity, reflections, and edition-specific rules must be modeled explicitly; the five term names are not a complete prediction.; topic: caution |
selected exact topic → embedded source label, explanatory statement and topic Units, indexing, boundary conditions and exceptional cases are defined in the calculation rules above.
| Output field | Meaning | Value type |
|---|---|---|
| source | Source used for the reference statement. | string |
| statement | Narrow reference statement for the selected topic. | string |
| topic | Selected reference topic. | string; one of "terms", "meteorology", "caution" |
{
"input": {
"topic": "terms"
},
"output": {
"source": "ISO 9613-2",
"statement": "The ISO 9613-2 engineering method combines geometrical divergence, atmospheric absorption, ground effect, barrier, and applicable miscellaneous attenuation terms.",
"topic": "terms"
}
}Limitations and assumptions
Terrain, weather, source directivity, reflections, and edition-specific rules must be modeled explicitly; the five term names are not a complete prediction. This is an introductory excerpt, not the complete standard, a current compliance check or a project-specific calculation.
Numeric inputs, where present, must be finite. Follow the calculation-specific rules for overflow, underflow and exceptional cases. Extremely large text inputs are rejected. Missing fields without a declared default, extra fields, wrong value types and violations of the calculation rules are input errors.
Alternative or Complementary methods
Use Microphone Placement Reference: Microphone height and distance from façades or other reflecting surfaces must follow the stated measurement standard and assessment objective. This reference explains the selected concept and the evidence needed to interpret it. For a complementary task, use FHWA Noise Abatement Reference: The federal Activity Category B exterior criterion for residential uses is 67 dBA Leq(h); impact policy also considers substantial increase under the state procedure. This reference explains the selected concept and the evidence needed to interpret it.
References
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ISO 9613-2 Attenuation Reference — tool.io
Similar or alternative tools
- Microphone Placement Reference
Microphone height and distance from façades or other reflecting surfaces must follow the stated measurement standard and assessment objective. This reference explains the selected concept and the evidence needed to interpret it.
- FHWA Noise Abatement Reference
The federal Activity Category B exterior criterion for residential uses is 67 dBA Leq(h); impact policy also considers substantial increase under the state procedure. This reference explains the selected concept and the evidence needed to interpret it.