Description
Calculate eligibleFrontage=perimeter-excludedFrontage and fraction=activeFrontage/eligibleFrontage.
A planning scenario combines parcel dimensions, frontage, service space, and explicitly supplied rules. Gross, excluded, and counted areas can use different bases. A geometric result describes the chosen model while site conditions and the governing requirements need separate verification.
Calculate eligibleFrontage=perimeter-excludedFrontage and fraction=activeFrontage/eligibleFrontage.
When to use this tool
Use Block Perimeter Active Frontage Share when you need the stated geometric or planning-indicator term under supplied site dimensions and rule choices.
How to use the tool and how it works
- Enter perimeter, excludedFrontage, activeFrontage. Use the units and conventions below.
- Run the tool. Correct any format, range, or cross-field input error before interpreting the output.
- Read eligibleFrontage, fraction. Use the output convention below.
Calculate eligibleFrontage=perimeter-excludedFrontage and fraction=activeFrontage/eligibleFrontage. Require a positive eligible base and nonnegative active frontage no greater than it.1
| Input field | Meaning and units | Accepted input |
|---|---|---|
| perimeter | Perimeter | Required. Finite number. |
| excludedFrontage | Excluded Frontage | Required. Finite number; minimum 0. |
| activeFrontage | Active Frontage | Required. Finite number; minimum 0. |
| Output field | Interpretation | Returned shape |
|---|---|---|
| eligibleFrontage | Eligible Frontage | Required. Finite number. |
| fraction | Dimensionless fraction under the stated basis. | Required. Finite number. |
{
"input": {
"perimeter": 400,
"excludedFrontage": 40,
"activeFrontage": 180
},
"output": {
"eligibleFrontage": 360,
"fraction": 0.5
}
}Limitations and assumptions
- Active and excluded frontage classifications are supplied. The fraction does not establish activity quality, public access, land-use compliance, or a measured street condition.
- The field tables state structural bounds; the mechanics also specify cross-field constraints. Malformed inputs and unsupported domains cause errors. A successful false flag, empty branch value, or zero placeholder has the meaning stated above and is distinct from an input error.
- 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. Signed zero is exported as zero.
Alternative or Complementary methods
Use measured site geometry and the applicable authoritative definitions when a planning decision needs more than this supplied term. A complete layout, access, or structural review can require additional models.
References
Similar or alternative tools
- Block Perimeter Access Share
Calculate accessibleLength=sum(accessibleSegments)-suppliedOverlap and accessShare=accessibleLength/perimeter.
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Calculate requiredWidth=racks*rackWidth+(racks-1)*gap+2*endClearance and margin=availableWidth-requiredWidth.