Note: A new GRASS GIS stable version has been released: GRASS GIS 7.8, available here.
Updated manual page: here
NAME
v.patch - Creates a new vector map by combining other vector maps.
KEYWORDS
vector,
geometry,
level1
SYNOPSIS
v.patch
v.patch --help
v.patch [-nzeab] input=name[,name,...] output=name [bbox=name] [--overwrite] [--help] [--verbose] [--quiet] [--ui]
Flags:
- -n
- Do not expect input with topology
- Applicable when input is points without topology
- -z
- Expect z coordinate even when not using topology
- Applicable when input is points with z coordinate but without topology
- -e
- Copy also attribute table
- Only the table of layer 1 is currently supported
- -a
- Append files to existing file (overwriting existing files must be activated)
- -b
- Do not build topology
- Advantageous when handling a large number of points
- --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[,name,...] [required]
- Name of input vector map(s)
- Or data source(s) for direct OGR access
- output=name [required]
- Name for output vector map
- bbox=name
- Name for output vector map where bounding boxes of input vector maps are written to
v.patch allows the user to combine any number of
vector maps together to create one composite vector
map. If the table structures are identical, attributes are
transferred to the new table.
Any vectors that are duplicated among the maps being
patched together (e.g., border lines) will have to be
edited or removed after
v.patch is run. Such
editing can be done automatically using
v.clean.
Lines may need to be
snapped with v.clean
tool=snap,break,rmdupl.
Boundaries may need to be cleaned with
v.clean tool=break,rmdupl,rmsa
repeatedly until the rmsa tool (Remove small angles at nodes)
no longer modifies any boundaries. If vector topology is still not
clean, boundaries may also need to be snapped with
v.clean tool=snap,break,rmdupl.
When using the -a flag, the user has to make sure that the
features in the different maps added to the output map do not have
overlapping category numbers, unless identical category numbers
reflect identical attributes, otherwise the attributes of the added
maps are lost. To avoid this, the user can use v.category
option=sum to change category values of some of the maps before
patching.
Patch together two maps with mixed feature types:
v.patch input=geology,streams out=geol_streams
Append one map to another:
g.copy vect=roads,transport
v.patch -a input=railroads output=transport --overwrite
v.clean,
v.build,
v.select,
v.overlay
Dave Gerdes, U.S.Army Construction Engineering
Research Laboratory
Radim Blazek, ITC-Irst, Trento, Italy
Last changed: $Date$
SOURCE CODE
Available at: v.patch source code (history)
Note: A new GRASS GIS stable version has been released: GRASS GIS 7.8, available here.
Updated manual page: here
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© 2003-2019
GRASS Development Team,
GRASS GIS 7.4.5dev Reference Manual