SpatialNetwork objectSpatialNetwork object.
graph.network.arrow.head.lth(object, network.name)
"graph.network.arrow.head.lth"(object, network.name)
"graph.network.arrow.head.lth"(object, network.name) <- valueSpatialNetwork object.object = SpatialNetwork,network.name = character: method for SpatialNetwork objects. object = SpatialNetwork,network.name = character,value = numeric: method for SpatialNetwork objects.