Description
Map a local cloud-code convention to oktas and a missing flag.
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.
Map a local cloud-code convention to oktas and a missing flag.
When to use this tool
Use Atmospheric Science: Cloud Cover Okta Missing Code Label when checking the stated optical, radiometric, cloud-code or coverage convention.
How to use the tool and how it works
- Enter code. Use the units and conventions below.
- Run the tool. Correct any format, range, or cross-field input error before interpreting the output.
- Read result. Expand result to inspect the returned fields.
Map a local cloud-code convention to oktas and a missing flag. Require whole code 0..9; codes 0..8 return fraction code/8, while nine returns missing true, oktas -1 and fraction zero placeholders.1
WMO table 2700 uses code nine for obscured sky, rather than a measured zero cloud fraction. This helper instead exposes its own code-nine missing placeholders, so source conventions must be checked.2
| Input field | Meaning and units | Accepted input |
|---|---|---|
| code | Code | Required. Safe integer. Calculation range: 0 through 9, inclusive. |
| Output field | Interpretation | Returned shape |
|---|---|---|
| result | Returned calculated value or nested object under the stated output convention. | Required. Object. |
| result.missing | Local code-nine missing convention; WMO cloud-table nine may instead mean obscured sky. | Calculated result member: boolean. |
| result.oktas | Oktas | Calculated result member: number. |
| result.fraction | Code/8 for 0..8; zero placeholder when missing=true. | Calculated result member: number. |
{
"input": {
"code": 9
},
"output": {
"result": {
"missing": true,
"oktas": -1,
"fraction": 0
}
}
}Limitations and assumptions
- This tool treats nine as missing; that local mapping must not be substituted for a source code table where nine denotes obscured sky.
- Outputs are nested inside result. 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
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