
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) $
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