v.patch(1grass) GRASS GIS User's Manual v.patch(1grass)
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
DESCRIPTION
v.patch allows the user to combine any number of vector maps together
to create one composite vector map. If the table structures are identi-
cal, attributes are transferred to the new table.
NOTES
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, bound-
aries may also need to be snapped with v.clean tool=snap,break,rmdupl.
When using the -e flag, v.patch shifts category (cat) values in the
output so that category numbers from the different input maps do not
overlap. This shift is applied to both the category values of the fea-
tures and the category values in the attribute tables. Hence, there is
no need to run v.category and v.db.update beforehand.
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 cat-
egory numbers, unless identical category numbers reflect identical at-
tributes, 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.
EXAMPLES
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
SEE ALSO
v.clean, v.build, v.select, v.overlay
AUTHORS
Dave Gerdes, U.S.Army Construction Engineering Research Laboratory
Radim Blazek, ITC-Irst, Trento, Italy
SOURCE CODE
Available at: v.patch source code (history)
Accessed: unknown
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GRASS 7.8.7 v.patch(1grass)
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