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v.lrs.where(1) Grass User's Manual v.lrs.where(1)

v.lrs.where - Finds line id and real km+offset for given points in vector map using linear reference system.

vector, linear reference system, network

v.lrs.where
 
v.lrs.where --help
 
v.lrs.where lines=name points=name [llayer= string] [player=string] [rsdriver=string] [rsdatabase=string] rstable= string [threshold=float] [--help] [-- verbose] [--quiet] [--ui]

--help
 
Print usage summary
--verbose
 
Verbose module output
--quiet
 
Quiet module output
--ui
 
Force launching GUI dialog

lines=name [required]
 
Name of input vector map
 
Input vector map containing lines
points=name [required]
 
Name of input vector map
 
Input vector map containing points
llayer=string
 
Layer number or name
 
Line layer
 
Default: 1
player=string
 
Layer number or name
 
Point layer
 
Default: 1
rsdriver=string
 
Driver name for reference system table
 
Options: dbf, ogr, pg, sqlite
 
Default: sqlite
rsdatabase=string
 
Database name for reference system table
 
Default: $GISDBASE/$LOCATION_NAME/$MAPSET/sqlite/sqlite.db
rstable=string [required]
 
Name of the reference system table
threshold=float
 
Maximum distance to nearest line
 
Default: 1000

v.lrs.where identifies line id and real milepost+offset for points in vector map using linear reference system.

This example is written for the Spearfish dataset (it continues the example from v.lrs.create).
In this example, the ’route_lrs’ shall be queried for unknown positions (points, stored in the map newpoints) along the LRS:
 
# generate query points
echo "590866.15|4926737.0
590933|4927133" | v.in.ascii out=newpoints
v.lrs.where lines=route_lrs points=newpoints rstable=route_lrs
pcat|lid|mpost|offset
pcat|lid|mpost|offset
1|22|4.000000+212.091461
2|22|6.000000+188.112093
# verification
g.region vector=route_lrs n=n+100 s=s-100 -p
d.erase
d.vect route_lrs
d.vect busstops disp=attr attr=cat size=10 bg=white lcol=blue yref=bottom
d.vect busstops icon=basic/circle fcol=blue
d.vect newpoints col=red
# measure distance to previous bus stop:
# use measuring tool in graphical user interface

LRS tutorial,
 
Introducing the Linear Reference System in GRASS,
 
v.lrs.where, v.lrs.segment, v.lrs.label

Radim Blazek, ITC-irst/MPA Solutions
 
Documentation update (based on above journal article and available fragments): Markus Neteler
Last changed: $Date: 2014-12-19 22:17:36 +0100 (Fri, 19 Dec 2014) $

Available at: v.lrs.where source code (history)
Main index | Vector index | Topics index | Keywords index | Graphical index | Full index
© 2003-2018 GRASS Development Team, GRASS GIS 7.4.3 Reference Manual
GRASS 7.4.3

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