Description
Multiply width by signed crossfall and retain or negate according to positiveTowardRight for rightMinusLeft.
Simple site geometry approximates an area, section, or volume using ideal shapes. Coherent length units and the distinction between signed and unsigned quantities determine the result's meaning.
Multiply width by signed crossfall and retain or negate according to positiveTowardRight for rightMinusLeft.
When to use this tool
Use Path Crossfall Height Difference when you need one transparent landscape geometry component.
How to use the tool and how it works
- Enter width, crossfall, positiveTowardRight. Use the units and conventions below.
- Run the tool. Correct any format, range, or cross-field input error before interpreting the output.
- Read rightMinusLeft. Use the output convention below.
Multiply width by signed crossfall and retain or negate according to positiveTowardRight for rightMinusLeft.1
| Input field | Meaning and units | Accepted input |
|---|---|---|
| width | Width, count, or interval span under the stated formula. | Required. Finite number; minimum 0. |
| crossfall | Signed rise/run fraction, for example 0.02 for 2%; not degrees. | Required. Finite number. |
| positiveTowardRight | Positive Toward Right | Required. Boolean. |
| Output field | Interpretation | Returned shape |
|---|---|---|
| rightMinusLeft | Right elevation minus left elevation in the width unit. | Required. Finite number. |
{
"input": {
"width": 2,
"crossfall": 0.02,
"positiveTowardRight": true
},
"output": {
"rightMinusLeft": 0.04
}
}Limitations and assumptions
- Crossfall is a dimensionless rise/run fraction, not percent or degrees; the result does not establish compliant drainage or accessibility.
- 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 surveyed terrain or construction model when irregular shapes, settlement, drainage, and structural performance matter.
References
Similar or alternative tools
- Landscape Contour Spot Height Interpolation
Interpolate lowHeight to highHeight by distanceFromLow / positive contourDistance, requiring the distance within that span.
- Dry Stone Wall Batter Offset
Multiply height by horizontalPerVertical for oneFaceOffset and by faceCount in {1, 2} for totalWidthReduction.