Description
Normalize a supplied landmark coordinate between two directed axis endpoints.
Developmental measurements depend on specimen identity, staging sources, coordinate registration, image scale and time-zero conventions. A section-area fraction differs from a volume, a generation-number step differs from verified lineage, and a midpoint of observations differs from an exact event time. Local scalar terms do not infer developmental mechanisms.
Normalize a supplied landmark coordinate between two directed axis endpoints.
When to use this tool
Use Embryonic Landmark Relative Axis Position when you already have landmarkCoordinate, axisStart, axisEnd and need to normalize a supplied landmark coordinate between two directed axis endpoints.
How to use the tool and how it works
- Enter landmarkCoordinate, axisStart, axisEnd. Use the units and conventions below.
- Run the tool. Correct any format, range, or cross-field input error before interpreting the output.
- Read axisFraction. Use the output convention below.
Require axisEnd!=axisStart; return (landmark-axisStart)/(axisEnd-axisStart).1
| Input field | Meaning and units | Accepted input |
|---|---|---|
| landmarkCoordinate | Landmark Coordinate | Required. Finite number. |
| axisStart | Axis Start | Required. Finite number. |
| axisEnd | Axis End | Required. Finite number. |
| Output field | Interpretation | Returned shape |
|---|---|---|
| axisFraction | Directed coordinate fraction; reversed axes and values outside [0,1] accepted. Extreme endpoint subtraction may overflow and yield a misleading zero; rescale first. | Required. Finite number. |
{
"input": {
"landmarkCoordinate": 12,
"axisStart": 10,
"axisEnd": 18
},
"output": {
"axisFraction": 0.25
}
}Limitations and assumptions
- Reversed axes and positions outside the endpoints are accepted, so fractions may be outside [0,1]. No anatomical axis, landmark or spatial registration is determined. Extreme endpoint subtraction can overflow and yield a misleading zero fraction; rescale consistent units first.
- 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 original specimens, calibrated images, acquisition timelines and staging references for biological interpretation. Use complete image, lineage and experimental analyses when needed; local ratios, source-qualified labels and supplied coordinate arithmetic do not perform those analyses.
References
Similar or alternative tools
- Morphogenesis Reference Landmark Distance
Calculate Euclidean distance between supplied matching coordinate arrays.
- Developing Tissue Anisotropy Axis Ratio
Calculate a supplied major-to-minor tissue-axis ratio.