GRID_SPREAD
===========

Python object: ``phenotypic.schema._grid_spread.GRID_SPREAD``

Quantify within-well colony dispersion using pairwise centroid distances.

Compute the sum of squared pairwise Euclidean distances between all
colony centroids in each grid section. High values indicate multiple
dispersed objects within a single well -- a sign of over-segmentation,
fragmented growth, or invasive spreading.

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

   * - Column label
     - Description
     - Type
   * - ``GridSpread_ObjectSpread``
     - Sum of squared pairwise Euclidean distances between all unique colony pairs within a grid section. Quantifies spatial dispersion of colonies in a grid cell. Higher values indicate greater spread from the section center, suggesting over-segmentation, multi-detections, or colonies growing beyond expected boundaries. Used to identify problematic grid sections requiring refinement or quality review.
     - :bdg-ref-secondary:`Quality <measurement-classification>`