1v.lrs.segment(1)            GRASS GIS User's Manual           v.lrs.segment(1)
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NAME

6       v.lrs.segment   - Creates points/segments from input lines, linear ref‐
7       erence system and positions read from stdin or a file.
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KEYWORDS

10       vector, linear reference system, network
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SYNOPSIS

13       v.lrs.segment
14       v.lrs.segment --help
15       v.lrs.segment       input=name       output=name        [llayer=string]
16       [rsdriver=string]    [rsdatabase=string]   rstable=string   [file=name]
17       [--overwrite]  [--help]  [--verbose]  [--quiet]  [--ui]
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19   Flags:
20       --overwrite
21           Allow output files to overwrite existing files
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23       --help
24           Print usage summary
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26       --verbose
27           Verbose module output
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29       --quiet
30           Quiet module output
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32       --ui
33           Force launching GUI dialog
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35   Parameters:
36       input=name [required]
37           Name of input vector map
38           Input vector map containing lines
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40       output=name [required]
41           Output vector map where segments will be written
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43       llayer=string
44           Layer number or name
45           Line layer
46           Default: 1
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48       rsdriver=string
49           Driver name for reference system table
50           Options: dbf, mesql, mysql, odbc, ogr, pg, sqlite
51           Default: sqlite
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53       rsdatabase=string
54           Database name for reference system table
55           Default: $GISDBASE/$LOCATION_NAME/$MAPSET/sqlite/sqlite.db
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57       rstable=string [required]
58           Name of the reference system table
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60       file=name
61           Name of file containing segment rules.  If  not  given,  read  from
62           stdin.
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DESCRIPTION

65       v.lrs.segment  creates  points/segments from input lines, linear refer‐
66       ence system and positions read from standard in or a file.
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68       The format is as follows:
69       P <point_id> <line_id> <milepost>+<offset> [<side offset>]
70       L <segment_id> <line_id> <milepost>+<offset> <milepost>+<offset> [<side offset>]
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NOTES

73       For more information and examples see the help page for v.lrs.segment’s
74       sister module, v.segment.
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EXAMPLE

77       This  example  is  written  for the Spearfish dataset (it continues the
78       example from v.lrs.create).
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80       In this example, the ’route_lrs’ shall be extended for a  new  position
81       (point) along the LRS after bus stop 4:
82       # new point on LRS
83       echo "P 7 22 4+180" | v.lrs.segment route_lrs out=route_lrs_new rstable=route_lrs
84       g.region vector=route_lrs n=n+100 s=s-100 -p
85       d.erase
86       # existing LRS
87       d.vect route_lrs
88       d.vect busstops disp=attr attr=cat size=10 bg=white lcol=blue yref=bottom
89       d.vect busstops icon=basic/circle fcol=blue
90       db.select table=route_lrs
91       # show modified map
92       d.vect route_lrs_new col=red
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TODO

95       Figure out how to merge result into existing LRS map and table.
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SEE ALSO

98        LRS tutorial,
99       Introducing the Linear Reference System in GRASS,
100       v.lrs.create, v.lrs.where, v.lrs.label, v.segment
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AUTHOR

103       Radim Blazek
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SOURCE CODE

106       Available at: v.lrs.segment source code (history)
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108       Main  index  | Vector index | Topics index | Keywords index | Graphical
109       index | Full index
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111       © 2003-2020 GRASS Development Team, GRASS GIS 7.8.5 Reference Manual
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115GRASS 7.8.5                                                   v.lrs.segment(1)