Note: This addon document is for an older version of GRASS GIS that will be discontinued soon. You should upgrade your GRASS GIS installation, and read the current addon manual page.
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: Mon Jun 28 07:54:09 2021 in commit: 1cfc0af029a35a5d6c7dae5ca7204d0eb85dbc55
Note: This addon document is for an older version of GRASS GIS that will be discontinued soon. You should upgrade your GRASS GIS installation, and read the current addon manual page.
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GRASS Development Team,
GRASS GIS 7.8.8dev Reference Manual