v.splitgrass - Online in the Cloud

PROGRAM:

NAME

v.split - Splits vector lines to shorter segments.

KEYWORDS

vector, geometry, densification, node, segment, vertex

SYNOPSIS

v.split
v.split --help
v.split [-n] input=name [layer=string] output=name [length=float] [units=string]
[vertices=integer] [--overwrite] [--help] [--verbose] [--quiet] [--ui]

Flags:
-n
Add new vertices, but do not split
Applies only to ’length’ option

--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

layer=string
Layer number or name (’-1’ for all layers)
A single vector map can be connected to multiple database tables. This number
determines which table to use. When used with direct OGR access this is the layer
name.
Default: -1

output=name [required]
Name for output vector map

length=float
Maximum segment length

units=string
Length units
Options: map, meters, kilometers, feet, surveyfeet, miles, nautmiles
Default: map

vertices=integer
Maximum number of vertices in segment

DESCRIPTION

v.split splits vector lines into shorter segments using a maximal distance between nodes.
The resulting length of all segments is expected to be equal and not higher than the given
length parameter.

EXAMPLES

The examples are based on the North Carolina sample data location.

Example 1: Inserting nodes to railroad map
# extract data for this example
v.extract railroads out=myrr cats=1
# show line, category, direction (to find the beginning)
d.vect myrr disp=shape,cat,dir
# insert nodes at a distance not longer than 1000m
v.split myrr out=mrr_split length=1000
d.vect myrr_split disp=shape,topo
Note: In case the data is not a polyline, build polylines in second step, eg.:
# join segments into polyline
v.build.polylines myrr out=myrr_poly
v.category myrr_pol out=myrailroads option=add

Example 2: Inserting vertices to railroad map
Note: first run the two steps from example 1.
# insert vertices at a distance not longer than 1000m
v.split -n myrr out=myrr_split length=1000
d.vect myrr_split disp=shape,topo

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