NAME¶

v.buffer - Creates a buffer around features of given type (areas must contain centroid).

KEYWORDS¶

vector, buffer

SYNOPSIS¶

v.buffer v.buffer help v.buffer [-sc] input=name output=name [ type=string[,string,...]] [layer=integer] [ distance=float] [minordistance=float] [angle= float] [bufcolumn=name] [scale=float] [ tolerance=float] [debug=string] [ buffer=float] [--overwrite] [-- verbose] [--quiet]

Flags:¶

-s

 

Make outside corners straight

-c

 

Don't make caps at the ends of polylines

--overwrite

 

Allow output files to overwrite existing files

--verbose

 

Verbose module output

--quiet

 

Quiet module output

Parameters:¶

input=name

 

Name of input vector map

output=name

 

Name for output vector map

type=string[,string,...]

 

Feature type

 

Options: point,line,boundary,centroid,area

 

Default: point,line,area

layer=integer

 

Layer number

 

A single vector map can be connected to multiple database tables. This number determines which table to use.

 

Default: 1

distance=float

 

Buffer distance along major axis in map units

minordistance=float

 

Buffer distance along minor axis in map units

angle=float

 

Angle of major axis in degrees

 

Default: 0

bufcolumn=name

 

Name of column to use for buffer distances

scale=float

 

Scaling factor for attribute column values

 

Default: 1.0

tolerance=float

 

Maximum distance between theoretical arc and polygon segments as multiple of buffer

 

Default: 0.01

debug=string

 

This does nothing. It is retained for backwards compatibility

buffer=float

 

This is an alias to the distance option. It is retained for backwards compatibility

 

Buffer distance in map units

DESCRIPTION¶

v.buffer creates a buffer around features of given type, which have a category in the given layer. The tolerance controls the number of vector segments being generated (the smaller the value, the more vector segments are generated).

NOTES¶

Attributes are not transferred due to potential buffer overlap, which cannot be resolved automatically.

EXAMPLES¶

Buffer around input lines¶

v.buffer input=map output=buffer type=line distance=100

Circles around input points¶

v.buffer input=pointsmap output=circles type=point distance=1000

Non-overlapping circles around input points with attribute transfer¶

v.buffer input=archsites output=circles type=point distance=200 # change original points to centroids: v.type in=archsites out=archcentroids type=point,centroid # patch circles and centroids: v.patch in=archcentroids,circles out=circles_db # attach attributes, either use # db.copy ... # or link to the original table: v.db.connect map=circles_db table=archsites field=1 key=cat driver=dbf \ database='$GISDBASE/$LOCATION_NAME/$MAPSET/dbf'

SEE ALSO¶

r.buffer, v.extract, v.type, v.patch, v.db.connect

AUTHORS¶

Radim Blazek Rewritten by Rosen Matev (with support through the Google Summer of Code program 2008) Last changed: $Date: 2011-11-08 10:42:51 +0100 (Tue, 08 Nov 2011) $ Full index © 2003-2011 GRASS Development Team