Description
Return physical length and area represented by a pixel.
Botanical measurements use explicit specimen geometry, pixel scales, length origins and angular direction. A projected-area ratio or geometric contribution summarizes supplied measurements without identifying a species, recovering an actual shape or establishing biological health.
Return physical length and area represented by a pixel.
When to use this tool
Use Leaf Area Scale Factor when checking the stated plant-measurement, geometry or angular convention.
How to use the tool and how it works
- Enter referencePixels, suppliedReferenceLength, sourceUnitInTargetUnits. Use the units and conventions below.
- Run the tool. Correct any format, range, or cross-field input error before interpreting the output.
- Read lengthPerPixel, areaPerPixel. Use the output convention below.
Return physical length and area represented by a pixel. Require positive referencePixels/referenceLength/sourceUnitInTargetUnits; lengthPerPixel = length*unitFactor/pixels, areaPerPixel is its square.1
| Input field | Meaning and units | Accepted input |
|---|---|---|
| referencePixels | Reference Pixels | Required. Finite number; strictly above 0. |
| suppliedReferenceLength | Supplied Reference Length | Required. Finite number; strictly above 0. |
| sourceUnitInTargetUnits | Source Unit In Target Units | Required. Finite number; strictly above 0. |
| Output field | Interpretation | Returned shape |
|---|---|---|
| lengthPerPixel | Length Per Pixel | Required. Finite number. |
| areaPerPixel | Square of the supplied length-calibration factor; area units scale quadratically. | Required. Finite number. |
{
"input": {
"referencePixels": 20,
"suppliedReferenceLength": 5,
"sourceUnitInTargetUnits": 1
},
"output": {
"lengthPerPixel": 0.25,
"areaPerPixel": 0.0625
}
}Limitations and assumptions
- The same calibrated scale is assumed on both image axes; lens distortion, image metadata and actual reference accuracy are not checked.
- 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
Inspect the specimen and measurement protocol, apply verified calibration and use an appropriate biological or geometric model for substantive interpretation.
References
Similar or alternative tools
- Chlorophyll Extract Area Normalizer
Normalize extracted pigment amount to leaf area.
- Leaf Area Reference Scale
Scale an explicit segmented leaf-pixel area to a supplied coplanar reference area without segmenting an image.