1v.patch(1) Grass User's Manual v.patch(1)
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6 v.patch - Creates a new vector map by combining other vector maps.
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9 vector, geometry, level1
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12 v.patch
13 v.patch --help
14 v.patch [-nzeab] input=name[,name,...] output=name [bbox=name]
15 [--overwrite] [--help] [--verbose] [--quiet] [--ui]
16 Flags:
18 -n
19 Do not expect input with topology
20 Applicable when input is points without topology
21 -z
23 Expect z coordinate even when not using topology
24 Applicable when input is points with z coordinate but without
25 topology
26 -e
28 Copy also attribute table
29 Only the table of layer 1 is currently supported
30 -a
32 Append files to existing file (overwriting existing files must be
33 activated)
34 -b
36 Do not build topology
37 Advantageous when handling a large number of points
38 --overwrite
40 Allow output files to overwrite existing files
41 --help
43 Print usage summary
44 --verbose
46 Verbose module output
47 --quiet
49 Quiet module output
50 --ui
52 Force launching GUI dialog
53 Parameters:
55 input=name[,name,...] [required]
56 Name of input vector map(s)
57 Or data source(s) for direct OGR access
58 output=name [required]
60 Name for output vector map
61 bbox=name
63 Name for output vector map where bounding boxes of input vector
64 maps are written to
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67 v.patch allows the user to combine any number of vector maps together
68 to create one composite vector map. If the table structures are identi‐
69 cal, attributes are transferred to the new table.
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72 Any vectors that are duplicated among the maps being patched together
73 (e.g., border lines) will have to be edited or removed after v.patch is
74 run. Such editing can be done automatically using v.clean.
75 Lines may need to be snapped with v.clean tool=snap,break,rmdupl.
77 Boundaries may need to be cleaned with v.clean tool=break,rmdupl,rmsa
79 repeatedly until the rmsa tool (Remove small angles at nodes) no longer
80 modifies any boundaries. If vector topology is still not clean, bound‐
81 aries may also need to be snapped with v.clean tool=snap,break,rmdupl.
82 When using the -e flag, v.patch shifts category (cat) values in the
84 output so that category numbers from the different input maps do not
85 overlap. This shift is applied to both the category values of the fea‐
86 tures and the category values in the attribute tables. Hence, there is
87 no need to run v.category and v.db.update beforehand.
88 When using the -a flag, the user has to make sure that the features in
90 the different maps added to the output map do not have overlapping cat‐
91 egory numbers, unless identical category numbers reflect identical
92 attributes, otherwise the attributes of the added maps are lost. To
93 avoid this, the user can use v.category option=sum to change category
94 values of some of the maps before patching.
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97 Patch together two maps with mixed feature types:
98 v.patch input=geology,streams out=geol_streams
99 Append one map to another:
100 g.copy vect=roads,transport
101 v.patch -a input=railroads output=transport --overwrite
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104 v.clean, v.build, v.select, v.overlay
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107 Dave Gerdes, U.S.Army Construction Engineering Research Laboratory
108 Radim Blazek, ITC-Irst, Trento, Italy
109 Last changed: $Date: 2018-11-01 08:54:25 +0100 (Thu, 01 Nov 2018) $
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113 Available at: v.patch source code (history)
114 Main index | Vector index | Topics index | Keywords index | Graphical
116 index | Full index
117 © 2003-2019 GRASS Development Team, GRASS GIS 7.6.0 Reference Manual
119GRASS 7.6.0 v.patch(1)