Description
Return max(0, rings-1) as holes and exteriorPresent when rings is positive.
A polygon ring is a closed sequence of coordinate positions. Closure, minimum position count, distinct vertices, winding, and self-intersection are separate properties, so a check of one cannot stand in for complete polygon validation.
Return max(0, rings-1) as holes and exteriorPresent when rings is positive.
When to use this tool
Use Polygon Hole Count From Rings when you need a specific ring-shape or closure diagnostic.
How to use the tool and how it works
- Enter rings. Use the units and conventions below.
- Run the tool. Correct any format, range, or cross-field input error before interpreting the output.
- Read holes, exteriorPresent. Inspect exteriorPresent before interpreting the associated values.
Require nonnegative integer rings. Return max(0, rings-1) as holes and exteriorPresent when rings is positive.1
| Input field | Meaning and units | Accepted input |
|---|---|---|
| rings | Rings | Required. Safe integer; minimum 0. |
| Output field | Interpretation | Returned shape |
|---|---|---|
| holes | Holes | Required. Safe integer. |
| exteriorPresent | Exterior Present | Required. Boolean. |
{
"input": {
"rings": 4
},
"output": {
"holes": 3,
"exteriorPresent": true
}
}Limitations and assumptions
- This interprets the first supplied ring count as exterior under the model; it does not inspect nested geometry, verify holes, or establish valid containment and winding.
- 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 a complete GeoJSON and polygon validator for publication or geometric operations. Check coordinate convention, distinctness, winding, self-intersection, and hole relationships as appropriate.
References
Similar or alternative tools
- Polygon Ring Closure Ordinate Consistency
Compare the first two ordinates for xyClosed and all ordinates and dimensions for fullyClosed.
- Polygon Ring Minimum Position Budget
Return max(0, 4-positions) and meetsMinimum when count is at least four.