RADIAL_EXPANSION
================

Python object: ``phenotypic.schema._radial_expansion.RADIAL_EXPANSION``

Radial expansion measurements for filamentous fungal colonies.

Quantifies branching morphology by decomposing colony structure into a
dense core and peripheral branches via PELT changepoint detection on
radial density profiles, followed by skeleton-based branch tracing.
Includes runner detection for identifying anomalously long branches.

.. list-table:: Category: **RadialExpansion**
   :header-rows: 1

   * - Column label
     - Description
   * - ``RadialExpansion_RobustMeanRadius``
     - Trimmed mean of branch path lengths, excluding detected runner. Represents the typical radial expansion distance of hyphae from the core boundary, robust to single-runner outliers.
   * - ``RadialExpansion_MeanRadius``
     - Arithmetic mean of all branch path lengths from core boundary to branch tips. Includes runner if present. Reflects overall average colony reach.
   * - ``RadialExpansion_MedianRadius``
     - Median branch path length. Robust to outliers and provides a typical expansion distance.
   * - ``RadialExpansion_NumBranches``
     - Number of skeleton branches extending from the core boundary to peripheral tips. Higher counts indicate denser branching morphology.
   * - ``RadialExpansion_MaxBranchLength``
     - Length of the longest branch path in pixels. When a runner is detected, this equals RunnerLength.
   * - ``RadialExpansion_RunnerLength``
     - Path length of the detected runner branch (the single longest outlier). NaN if no runner detected.
   * - ``RadialExpansion_RunnerDetected``
     - Boolean flag (0 or 1) indicating whether an outlier runner branch was detected for this colony.
   * - ``RadialExpansion_CoreRadius``
     - Radius of the dense colony core as determined by PELT changepoint detection on the radial density profile. Pixels within this radius of the intensity-weighted centroid are excluded from skeleton analysis.