1v.net.connectivity(1)         Grass User's Manual        v.net.connectivity(1)
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NAME

6       v.net.connectivity   - Computes vertex connectivity between two sets of
7       nodes in the network.
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KEYWORDS

10       vector, network, connectivity
11

SYNOPSIS

13       v.net.connectivity
14       v.net.connectivity --help
15       v.net.connectivity input=name  [arc_layer=string]   [node_layer=string]
16       [arc_column=name]   [arc_backward_column=name]  output=name  [node_col‐
17       umn=name]           [set1_cats=range]            [set1_where=sql_query]
18       [set2_cats=range]    [set2_where=sql_query]    [--overwrite]   [--help]
19       [--verbose]  [--quiet]  [--ui]
20
21   Flags:
22       --overwrite
23           Allow output files to overwrite existing files
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25       --help
26           Print usage summary
27
28       --verbose
29           Verbose module output
30
31       --quiet
32           Quiet module output
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34       --ui
35           Force launching GUI dialog
36
37   Parameters:
38       input=name [required]
39           Name of input vector map
40           Or data source for direct OGR access
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42       arc_layer=string
43           Arc layer
44           Vector features can have category values in different layers.  This
45           number  determines  which  layer  to use. When used with direct OGR
46           access this is the layer name.
47           Default: 1
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49       node_layer=string
50           Node layer
51           Vector features can have category values in different layers.  This
52           number  determines  which  layer  to use. When used with direct OGR
53           access this is the layer name.
54           Default: 2
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56       arc_column=name
57           Arc forward/both direction(s) cost column (number)
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59       arc_backward_column=name
60           Arc backward direction cost column (number)
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62       output=name [required]
63           Name for output vector map
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65       node_column=name
66           Node cost column (number)
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68       set1_cats=range
69           Set1 category values
70           Example: 1,3,7-9,13
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72       set1_where=sql_query
73           Set1 WHERE conditions of SQL statement without ’where’ keyword
74           Example: income < 1000 and population >= 10000
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76       set2_cats=range
77           Category values
78           Set2 category values
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80       set2_where=sql_query
81           Set2 WHERE conditions of SQL statement without ’where’ keyword
82           Example: income < 1000 and population >= 10000
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DESCRIPTION

85       v.net.connectivity computes vertex connectivity between two sets,  i.e.
86       the  minimum  number of vertices whose removal would separate two given
87       sets.
88

NOTES

90       Two sets (set1 and set2) are specified by respective layer,  where  and
91       cats  parameters.  Similarly  to v.net.flow module, capacities of nodes
92       can be given by node_column option. v.net.connectivity finds the set of
93       nodes of minimum total capacitiy separating the two given sets and out‐
94       puts map containing points on the positions  of  these  nodes.  Default
95       capacity, which is used when no column is specified, is one.
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EXAMPLES

98       The  following  command finds the minimum number of intersections sepa‐
99       rating roads on the left bank from roads on the right bank.
100       v.net.connectivity input=roads output=roads_conn set1_where="bank=left" \
101             set2_where="bank=right"
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103       v.net.connectivity input=airtraffic output=connectivity \
104             set1_where="name=JFK" set2_where="name=Heathrow" node_column=capacity
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SEE ALSO

107        v.net, v.net.flow, v.net.bridge
108

AUTHORS

110       Daniel Bundala, Google Summer of Code 2009, Student
111       Wolf Bergenheim, Mentor
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SOURCE CODE

114       Available at: v.net.connectivity source code (history)
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116       Main index | Vector index | Topics index | Keywords index  |  Graphical
117       index | Full index
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119       © 2003-2019 GRASS Development Team, GRASS GIS 7.8.2 Reference Manual
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123GRASS 7.8.2                                              v.net.connectivity(1)