v.net.iso(1)

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

6       v.net.iso   -  Split net to bands between cost isolines (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.iso
15       v.net.iso help
16       v.net.iso   [-g]   input=name  output=name   [type=string[,string,...]]
17       [alayer=integer]     [nlayer=integer]     [afcolumn=string]     [abcol‐
18       umn=string]   [ncolumn=string]  ccats=range costs=integer[,integer,...]
19       [--overwrite]
20
21   Flags:
22       -g  Use geodesic calculation for longitude-latitude locations
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24       --overwrite
25
26   Parameters:
27       input=name
28           Name of input vector map
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30       output=name
31           Name for output vector map
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33       type=string[,string,...]
34           Arc type Options: line,boundary Default: line,boundary
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36       alayer=integer
37           Arc layer Default: 1
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39       nlayer=integer
40           Node layer Default: 2
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42       afcolumn=string
43           Arc forward/both direction(s) cost column (number)
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45       abcolumn=string
46           Arc backward direction cost column (number)
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48       ncolumn=string
49           Node cost column (number)
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51       ccats=range
52           Category values Categories of centres (points on  nodes)  to  which
53           net will be allocated, layer for this categories is given by nlayer
54           option.
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56       costs=integer[,integer,...]
57           Costs for isolines
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DESCRIPTION

60       v.net.iso splits net to bands between  cost  isolines  (direction  from
61       centre).  Centre node must be opened (costs >= 0). Costs of centre node
62       are used in calculation. Supported are cost assignments for  both  arcs
63       and  nodes, and also different in both directions of a vector line. For
64       areas cost will be calculated along boundary lines.
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NOTES

67       Nodes must be on the isolines.
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69       Center nodes have to be assigned to vector nodes. Nodes and arcs can be
70       closed using cost = -1.
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EXAMPLE

73       Subdivision of a network into areas:
74       The  map must contain at least one center (point) on the vector network
75       which can be patched into with v.patch.
76       v.net.iso input=streets output=isomap ccats=1 costs=1000,2000,5000
77        that should cut network to 4 categories:
78       cat | distance from point
79       1          0 - 1000
80       2       1000 - 2000
81       3       2000 - 5000
82       4            > 5000
83        To see the result, run for example:
84       d.vect isomap col=green  cats=1
85       d.vect isomap col=yellow cats=2
86       d.vect isomap col=orange cats=3
87       d.vect isomap col=red    cats=4
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AUTHOR

95       Radim Blazek, ITC-Irst, Trento, Italy
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97       Last changed: $Date: 2007/05/02 20:15:58 $
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99       Full index
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103GRASS 6.2.2                                                       v.net.iso(1)