v.patch(1grass)

1v.patch(1)                    Grass User's Manual                   v.patch(1)
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NAME

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

9       vector, geometry, level1
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SYNOPSIS

12       v.patch
13       v.patch --help
14       v.patch   [-nzeab]   input=name[,name,...]   output=name    [bbox=name]
15       [--overwrite]  [--help]  [--verbose]  [--quiet]  [--ui]
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17   Flags:
18       -n
19           Do not expect input with topology
20           Applicable when input is points without topology
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22       -z
23           Expect z coordinate even when not using topology
24           Applicable when input is  points  with  z  coordinate  but  without
25           topology
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27       -e
28           Copy also attribute table
29           Only the table of layer 1 is currently supported
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31       -a
32           Append  files  to existing file (overwriting existing files must be
33           activated)
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35       -b
36           Do not build topology
37           Advantageous when handling a large number of points
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39       --overwrite
40           Allow output files to overwrite existing files
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42       --help
43           Print usage summary
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45       --verbose
46           Verbose module output
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48       --quiet
49           Quiet module output
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51       --ui
52           Force launching GUI dialog
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54   Parameters:
55       input=name[,name,...] [required]
56           Name of input vector map(s)
57           Or data source(s) for direct OGR access
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59       output=name [required]
60           Name for output vector map
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62       bbox=name
63           Name for output vector map where bounding  boxes  of  input  vector
64           maps are written to
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DESCRIPTION

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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NOTES

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.
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76       Lines may need to be snapped with v.clean tool=snap,break,rmdupl.
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78       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.
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83       When using the -a flag, the user has to make sure that the features  in
84       the different maps added to the output map do not have overlapping cat‐
85       egory numbers, unless  identical  category  numbers  reflect  identical
86       attributes,  otherwise  the  attributes  of the added maps are lost. To
87       avoid this, the user can use v.category option=sum to  change  category
88       values of some of the maps before patching.
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EXAMPLES

91       Patch together two maps with mixed feature types:
92          v.patch input=geology,streams out=geol_streams
93       Append one map to another:
94          g.copy vect=roads,transport
95          v.patch -a input=railroads output=transport --overwrite
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AUTHORS

101       Dave Gerdes, U.S.Army Construction Engineering Research Laboratory
102       Radim Blazek, ITC-Irst, Trento, Italy
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104       Last changed: $Date: 2011-11-08 22:24:20 +0100 (Tue, 08 Nov 2011) $
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SOURCE CODE

107       Available at: v.patch source code (history)
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109       Main  index  | Vector index | Topics index | Keywords index | Graphical
110       index | Full index
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112       © 2003-2019 GRASS Development Team, GRASS GIS 7.4.4 Reference Manual
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116GRASS 7.4.4                                                         v.patch(1)