v.to.lines.py - GRASS manual

NAME

v.to.lines.py - Converts vector polygons or points to lines.

KEYWORDS

SYNOPSIS

v.to.lines.py

v.to.lines.py --help

v.to.lines.py input=name output=name [method=string] [--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]: Name of input vector map; Or data source for direct OGR access
output=name [required]: Name for output vector map
method=string: Method used for point interpolation; Options: delaunay; Default: delaunay

DESCRIPTION
NOTES
EXAMPLES
- Area to line conversion
- Point to line conversion
SEE ALSO
AUTHOR

DESCRIPTION

v.to.lines converts vector polygons (boundaries) to lines as well as vector points to lines via triangulations.

NOTES

v.to.lines is able to convert point data (via triangulation) and areas to lines (via boundary to line conversion). This script is a wrapper script to v.category, v.delaunay, and v.edit.

In order to convert an ordered list of coordinates (ASCII table with x,y[,z] coordinates) into vector lines, use v.in.lines.

EXAMPLES

The examples are for the North Carolina sample dataset:

Area to line conversion

v.to.lines input=boundary_municp output=boundary_municp_lines

Point to line conversion

v.to.lines input=geodetic_pts output=geodetic_pts_lines

AUTHOR

Luca Delucchi, Fondazione Edmund Mach

SOURCE CODE

Available at: v.to.lines source code (history)

Latest change: Tuesday Jan 13 09:49:07 2026 in commit: d2ee7c143d35d150a935150c80bdabcb45c7ac3a