v.net.alloc(1)

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

6       v.net.alloc   -  Allocate  subnets  for nearest centres (direction from
7       centre). Centre node must be opened (costs >= 0). Costs of centre  node
8       are used in calculation
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KEYWORDS

11       vector, networking
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SYNOPSIS

14       v.net.alloc
15       v.net.alloc help
16       v.net.alloc  [-g]  input=name  output=name   [type=string[,string,...]]
17       [alayer=integer]     [nlayer=integer]     [afcolumn=string]     [abcol‐
18       umn=string]   [ncolumn=string]  ccats=range  [--overwrite]
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20   Flags:
21       -g  Use geodesic calculation for longitude-latitude locations
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23       --overwrite
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25   Parameters:
26       input=name
27           Name of input vector map
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29       output=name
30           Name for output vector map
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32       type=string[,string,...]
33           Arc type Options: line,boundary Default: line,boundary
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35       alayer=integer
36           Arc layer Default: 1
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38       nlayer=integer
39           Node layer Default: 2
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41       afcolumn=string
42           Arc forward/both direction(s) cost column (number)
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44       abcolumn=string
45           Arc backward direction cost column (number)
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47       ncolumn=string
48           Node cost column (number)
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50       ccats=range
51           Category  values  Categories  of centres (points on nodes) to which
52           net will be allocated, layer for this categories is given by nlayer
53           option.
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DESCRIPTION

56       v.net.alloc  allocates subnets for nearest centres (direction from cen‐
57       tre). Centre node must be opened (costs >= 0). Costs of centre node are
58       used  in  calculation. Supported are cost assignments for both arcs and
59       nodes, and also different in both directions  of  a  vector  line.  For
60       areas cost will be calculated along boundary lines.
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NOTES

63       Center  nodes have to be assigned to vector nodes using v.digit.  Nodes
64       and arcs can be closed using cost = -1.
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EXAMPLE

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68       # nlayer=1 if no extra table for nodes:
69       v.net.alloc network out=network_alloc ccats=0-13 nlayer=1
70       # the result has to be selected by  category  number  of  the  relevant
71       node:
72       d.vect network_alloc cat=9 col=red
73       d.vect network_alloc cat=11 col=green
74       d.vect network_alloc cat=2492 col=yellow
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76
77       Calculating  subnets  for  7 centre nodes using cost assigned to vector
78       length
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80       v.net.alloc in=vectmap out=vectmap.alloc ccats=1-7
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82
83       Calculating subnets for 7 centre nodes using cost assignments  in  both
84       directions
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86       v.net.alloc  in=vectmap  afcol=INDEX  abcol=INDEXBACK out=vectmap.alloc
87       ccats=1-7
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AUTHOR

94       Radim Blazek, ITC-Irst, Trento, Italy
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96       Last changed: $Date: 2007/05/02 20:15:58 $
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98       Full index
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102GRASS 6.2.2                                                     v.net.alloc(1)