NAME
v.concave.hull - Creates a concave hull around points.
KEYWORDS
vector,
geometry,
alpha shape
SYNOPSIS
v.concave.hull
v.concave.hull --help
v.concave.hull input=name output=name [threshold=float] [--overwrite] [--help] [--verbose] [--quiet] [--ui]
Flags:
- --overwrite
- Allow output files to overwrite existing files
- --help
- Print usage summary
- --verbose
- Verbose module output
- --quiet
- Quiet module output
- --ui
- Force launching GUI dialog
Parameters:
- input=name [required]
- Input points
- Or data source for direct OGR access
- output=name [required]
- Name for output vector map
- threshold=float
- Lower values make the hull more concave
- Options: 0-10
- Default: 7
v.concave.hull creates a concave hull around points. Contrary
to a convex hull, a concave hull can describe the shape of a point cloud.
Creating a convex and a concave hull around schools_wake in the
North Carolina sample dataset:
v.hull in=schools_wake out=schools_wake_convex
v.concave.hull in=schools_wake out=schools_wake_concave
Convex hull around schools:
Concave hull around schools:
Alpha shapes around points (left: threshold=8; right: threshold=0.5):
v.hull,
v.buffer,,
v.kernel
Markus Metz
SOURCE CODE
Available at:
v.concave.hull source code
(history)
Latest change: Monday Jan 30 19:52:26 2023 in commit: cac8d9d848299297977d1315b7e90cc3f7698730
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GRASS Development Team,
GRASS GIS 8.2.2dev Reference Manual