Description
Return contrast-threshold visibility under an extinction model.
Atmospheric optical and radiation quantities distinguish spectral density, integrated flux, solid-angle response and reporting codes. A local attenuation factor, bin contribution or coverage bound requires compatible geometry and definitions rather than establishing a complete radiative transfer or observed cloud state.
Return contrast-threshold visibility under an extinction model.
When to use this tool
Use Visibility Extinction Supplied Coefficient when checking the stated optical, radiometric, cloud-code or coverage convention.
How to use the tool and how it works
- Enter extinction, contrastThreshold. Use the units and conventions below.
- Run the tool. Correct any format, range, or cross-field input error before interpreting the output.
- Read visibility. Use the output convention below.
Return contrast-threshold visibility under an extinction model. Require extinction > 0 and contrastThreshold in (0,1); visibility = -ln(threshold)/extinction.1
| Input field | Meaning and units | Accepted input |
|---|---|---|
| extinction | Extinction | Required. Finite number; strictly above 0. |
| contrastThreshold | Contrast Threshold | Required. Finite number; strictly above 0; strictly below 1. |
| Output field | Interpretation | Returned shape |
|---|---|---|
| visibility | Visibility | Required. Finite number. |
{
"input": {
"extinction": 0.01,
"contrastThreshold": 0.05
},
"output": {
"visibility": 299.57322735539907
}
}Limitations and assumptions
- This assumes uniform extinction and the supplied contrast definition; actual visual range, weather and transport safety are not determined.
- Inputs must satisfy both the field types and the cross-field conditions above. Invalid input causes an error; a successful false flag or documented placeholder is a different result.
- Numeric calculations use binary floating point unless exact decimal-integer arithmetic is explicitly stated. No hidden measurement tolerance or decimal rounding is added; nonfinite or out-of-contract results are rejected. Numeric signed-zero results are exported as zero.
Alternative or Complementary methods
Use the source-specific observation code table and an appropriate calibrated spectral/atmospheric model for actual cloud or radiative interpretation.
References
Similar or alternative tools
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