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NAMEv.lrs.where - Finds line id and real km+offset for given points in vector map using linear reference system.KEYWORDSvector, linear reference system, networkSYNOPSISv.lrs.wherev.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] Flags:
Parameters:
DESCRIPTIONv.lrs.where identifies line id and real milepost+offset for points in vector map using linear reference system.EXAMPLEThis 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 SEE ALSOLRS tutorial,Introducing the Linear Reference System in GRASS, v.lrs.where, v.lrs.segment, v.lrs.label AUTHORRadim Blazek, ITC-irst/MPA SolutionsDocumentation update (based on above journal article and available fragments): Markus Neteler SOURCE CODEAvailable at: v.lrs.where source code (history)Main index | Vector index | Topics index | Keywords index | Graphical index | Full index © 2003-2021 GRASS Development Team, GRASS GIS 7.8.6 Reference Manual
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