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v.buffer.1grass
Langue: en
Version: 336852 (ubuntu - 24/10/10)
Section: 1 (Commandes utilisateur)
Sommaire
NAME
v.buffer - Creates a buffer around features of given type (areas must contain centroid).KEYWORDS
vector, bufferSYNOPSIS
v.bufferv.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.connectAUTHORS
Radim BlazekRewritten 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) $
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