v.patchgrass - Online in the Cloud

PROGRAM:

NAME

v.patch - Creates a new vector map by combining other vector maps.

KEYWORDS

vector, geometry

SYNOPSIS

v.patch
v.patch --help
v.patch [-aeb] input=name[,name,...] output=name [bbox=name] [--overwrite] [--help]
[--verbose] [--quiet] [--ui]

Flags:
-a
Append files to existing file (overwriting existing files must be activated)

-e
Copy also attribute table
Only the table of layer 1 is currently supported

-b
Do not build topology

--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 identical, 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, 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.

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

Use v.patchgrass online using onworks.net services