Description
Sum contact cells into contactArea and those also valid and calibrated into supportedArea; return share=supportedArea/contactArea when positive, otherwise zero with defined=false.
Foot and footwear research uses geometric dimensions, contact cells, forces, and measurement records. A length margin, normalized difference, or contact share has a specific measurement basis and can omit important three-dimensional or sensor effects. Arithmetic on supplied observations is separate from a validated clinical assessment.
Sum contact cells into contactArea and those also valid and calibrated into supportedArea; return share=supportedArea/contactArea when positive, otherwise zero with defined=false.
When to use this tool
Use Plantar Grid Support Share when you have supplied foot, footwear, bench, or recording data and need this measurement or record-support calculation.
How to use the tool and how it works
- Enter cellAreas, contact, sensorValid, calibrated. Keep parallel arrays aligned. Use the units and conventions below.
- Run the tool. Correct any format, range, or cross-field input error before interpreting the output.
- Read contactArea, supportedArea, share, defined. Inspect defined before interpreting the associated values.
Require aligned nonnegative cellAreas and contact, sensorValid, and calibrated flags. Sum contact cells into contactArea and those also valid and calibrated into supportedArea; return share=supportedArea/contactArea when positive, otherwise zero with defined=false.1
| Input field | Meaning and units | Accepted input |
|---|---|---|
| cellAreas | Cell Areas | Required. Array of finite number; minimum 0; maximum items 256. |
| contact | Contact | Required. Array of boolean; maximum items 256. |
| sensorValid | Sensor Valid | Required. Array of boolean; maximum items 256. |
| calibrated | Calibrated | Required. Array of boolean; maximum items 256. |
| Output field | Interpretation | Returned shape |
|---|---|---|
| contactArea | Contact Area | Required. Finite number. |
| supportedArea | Supported Area | Required. Finite number. |
| share | Dimensionless share under the stated base; not a percentage numeral. | Required. Finite number. |
| defined | Whether the associated ratio is defined; inspect before using a zero placeholder. | Required. Boolean. |
{
"input": {
"cellAreas": [
2,
3,
5
],
"contact": [
true,
true,
false
],
"sensorValid": [
true,
true,
true
],
"calibrated": [
true,
false,
true
]
},
"output": {
"contactArea": 5,
"supportedArea": 2,
"share": 0.4,
"defined": true
}
}Limitations and assumptions
- Area weights and flags are supplied, and overlapping cells are not removed. A high support share does not establish measurement accuracy or a clinical pressure interpretation.
- 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. Signed zero is exported as zero.
Alternative or Complementary methods
Use a documented measurement protocol with calibrated equipment and appropriate geometric or contact models. Broader interpretation requires assessment of the underlying observations beyond one length, ratio, or support flag.
References
Similar or alternative tools
- Plantar Contact Share
Compute an explicit research contact-cell share without plantar-risk interpretation.
- Plantar Pressure Cell Force
Convert one supplied sensor-cell pressure and area to force using explicit compatible SI unit factors; no gait interpretation.