fn_registry/python/functions/datascience/alpha_shape_concave_hull.md

id, name, kind, lang, domain, version, purity, signature, description, tags, uses_functions, uses_types, returns, returns_optional, error_type, imports, example, tested, tests, test_file_path, file_path, params, output, source_repo, source_license, source_file

id	name	kind	lang	domain	version	purity	signature	description	tags	uses_functions	uses_types	returns	returns_optional	error_type	imports	example	tested	tests	test_file_path	file_path	params	output	source_repo	source_license	source_file
alpha_shape_concave_hull_py_datascience	alpha_shape_concave_hull	function	py	datascience	1.0.0	pure	def alpha_shape_concave_hull(points: list[tuple[float, float]], alpha: float) -> shapely.geometry.base.BaseGeometry | None	Computes the alpha-shape (concave hull) of a 2-D point set via Delaunay triangulation, filtering triangles by circumradius <= alpha and merging survivors.	geometry spatial concave-hull alpha-shape shapely delaunay pendiente-usar				false		numpy shapely	from alpha_shape_concave_hull import alpha_shape_concave_hull pts = [(0.0,0.0),(1.0,0.0),(1.0,1.0),(0.0,1.0)] geom = alpha_shape_concave_hull(pts, alpha=10.0) # shapely Polygon	true	test_alpha_shape_square_large_alpha test_alpha_shape_too_few_points test_alpha_shape_very_small_alpha_returns_none test_alpha_shape_5_points_returns_geometry	python/functions/datascience/tests/test_alpha_shape_concave_hull.py	python/functions/datascience/alpha_shape_concave_hull.py	name desc points List of (x, y) coordinate pairs. Requires at least 4 points. name desc alpha Alpha radius parameter. Triangles with circumradius > alpha are discarded. Smaller alpha = more concave hull.	Shapely geometry (Polygon or MultiPolygon) of the alpha-shape, or None if fewer than 4 points or no triangles survive the alpha filter.	internal:footprint_aurgi	internal-aurgi	ponderacion_isochronas/src/recomendador_centros.py:408

Requiere shapely. Si shapely no esta instalado, retorna None en silencio. returns_optional=true porque puede no haber triangulos validos.