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


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


vector, LRS, networking
v.lrs.where v.lrs.where help v.lrs.where lines=name points=name [llayer=integer] [player=integer] [rsdriver=string] [rsdatabase=string] rstable=string [thresh=float] [--verbose] [--quiet] Parameters: lines=name Input vector map containing lines points=name Input vector map containing points llayer=integer Layer number Line layer Default: 1 player=integer Layer number Point layer Default: 1 rsdriver=string Driver name for reference system table Default: dbf rsdatabase=string Database name for reference system table Default: $GISDBASE/$LOCATION_NAME/$MAPSET/dbf/ rstable=string Name of the reference system table thresh=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 vect=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 d.measure


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: 2007-06-28 17:28:50 +0200 (Thu, 28 Jun 2007) $ Full index (C) 2003-2010 GRASS Development Team V.LRS.WHERE(1)

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