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

6       v.net  - Network maintenance.
7

KEYWORDS

9       vector, networking
10

SYNOPSIS

12       v.net
13       v.net help
14       v.net   [-c]   input=name    [points=name]     [output=name]    [opera‐
15       tion=string]    [alayer=integer]    [nlayer=integer]     [thresh=float]
16       [--overwrite]  [--verbose]  [--quiet]
17
18   Flags:
19       -c
20           Assign unique categories to new points
21           For operation 'nodes'
22
23       --overwrite
24           Allow output files to overwrite existing files
25
26       --verbose
27           Verbose module output
28
29       --quiet
30           Quiet module output
31
32   Parameters:
33       input=name
34           Name of input vector map
35
36       points=name
37           Name of input point vector map
38           Required for operation 'connect'
39
40       output=name
41           Name for output vector map
42
43       operation=string
44           Operation to be performed
45           Options: nodes,connect,report,nreport
46           Default: nodes
47           nodes: new point is placed on each node (line end) if doesn't exist
48           connect:  connect  still  unconnected  points  to vector network by
49           inserting new line(s)
50           report: print to standard output  {line_category  start_point_cate‐
51           gory end_point_category}
52           nreport:   print  to  standard  output  {point_category  line_cate‐
53           gory[,line_category...]}
54
55       alayer=integer
56           Arc layer (network)
57           A single vector map can be connected to multiple  database  tables.
58           This number determines which table to use.
59           Default: 1
60
61       nlayer=integer
62           Node layer (points)
63           A  single  vector map can be connected to multiple database tables.
64           This number determines which table to use.
65           Default: 2
66
67       thresh=float
68           Threshold
69           Required for operation 'connect'. Connect points in  given  thresh‐
70           old.
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DESCRIPTION

73       v.net  is  used  for vector network maps maintenance.  It reports about
74       the current network graph status.  It also permits to  globally  insert
75       missing  nodes  and  to connect unconnected nodes to the graph within a
76       given distance threshold.
77
78   NOTES
79       If vector editing is required to modify the graph,  v.digit  or  v.edit
80       can  be  used.  Separately,  Linear  Referencing System is available in
81       GRASS.
82
83   EXAMPLES
84       Spearfish based examples:
85
86       Create nodes globally for all line ends and intersections:
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88       v.net in=streams out=streams_node
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90
91       Merge in nodes from a separate map within given threshold:
92
93       echo "1|601653.5|4922869.2|start
94       2|593330.8|4924096.6|end"  |  v.in.ascii  cat=1  x=2  y=3  out=startend
95       col="cat integer, \
96                                east double precision, north double precision,
97       label varchar(43)"
98       #create lines map connecting points to network (on layer 2)
99       v.net myroads points=startend out=myroads_net op=connect thresh=200
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SEE ALSO

103       v.digit, v.edit, v.net.iso, v.net.path, v.net.steiner, v.net.salesman
104

AUTHORS

106       Radim Blazek, ITC-Irst, Trento, Italy
107       Martin Landa, FBK-Irst, Trento, Italy
108
109       Last changed: $Date: 2007-12-17 14:45:01 +0100 (Mon, 17 Dec 2007) $
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111       Full index
112
113       © 2003-2008 GRASS Development Team
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117GRASS 6.3.0                                                           v.net(1)
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