v.lrs.where
Finds line id and real km+offset for given points in vector map using linear reference system. 
Vector (v.*)
ParameterVector|lines|Input vector map containing lines|1|False
ParameterVector|points|Input vector map containing reference points|0|False
ParameterTable|rstable|Name of the reference system table|False
ParameterNumber|thresh|Maximum distance of point to line allowed|0|None|1000|True
OutputFile|output|LRS Points