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v.buffer

man page of v.buffer

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

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: 2008-03-16 16:29:33 +0100 (Sun, 16 Mar 2008) $ Full index (C) 2003-2010 GRASS Development Team V.BUFFER(1)
 
 
 

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