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v.hull: Produces a convex hull for a given vector map.

v.hull - Produces a convex hull for a given vector map.


vector, geometry


v.hull v.hull help v.hull [-af] input=name output=name [--overwrite] [--verbose] [--quiet] Flags: -a Use all vector points (do not limit to current region) -f Create a 'flat' 2D hull even if the input is 3D points --overwrite Allow output files to overwrite existing files --verbose Verbose module output --quiet Quiet module output Parameters: input=name Name of input vector map For vector lines reads their vertices output=name Name for output vector map


v.hull computes the convex hull of a vector map and outputs the convex hull polygon as a vector area map. The convex hull, or convex envelope, for an object or a set of objects is the minimal convex set containing the given objects. This module creates a vector polygon containing all vector points or lines of the input map. In the case of 3D input points, the hull will be a 3D hull as well, unless the user specifies the -f flag. The 3D hull will be composed of triangular faces. | Fig: Convex hull polygon created with v.hull


Example of v.hull 3D output (using two random 3D point clouds): g.region rural_1m -p r.mapcalc zero=0 v.random -z output=random3d_a n=10 zmin=0 zmax=200 v.random -z output=random3d_b n=15 zmin=400 zmax=600 v.hull input=random3d_a output=random3d_a_hull v.hull input=random3d_b output=random3d_b_hull nviz elevation=zero vect=random3d_a_hull,random3d_b_hull
M. de Berg, M. van Kreveld, M. Overmars, O. Schwarzkopf, (2000). Computational geometry, chapter 1.1, 2-8. J. O'Rourke, (1998). Computational Geometry in C (Second Edition), chapter 4.


Andrea Aime, Modena, Italy Markus Neteler, ITC-irst (update to 5.7) Benjamin Ducke, CAU Kiel (3D hull support) Martin Landa, CTU in Prague, Czech Republic (vector lines support) Last changed: $Date: 2010-04-04 18:38:22 +0200 (Sun, 04 Apr 2010) $ Full index (C) 2003-2010 GRASS Development Team V.HULL(1)

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