v.lrs.where(1grass) | GRASS GIS User's Manual | v.lrs.where(1grass) |
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]
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
v.lrs.where, v.lrs.segment, v.lrs.label
LRS tutorial,
Introducing the Linear Reference System in GRASS
Radim Blazek, ITC-irst/MPA Solutions
Documentation update (based on above journal article and available fragments):
Markus Neteler
Available at: v.lrs.where source code (history)
Accessed: Sunday Jan 22 07:37:05 2023
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