Find all upstream segments from a specified river segment.

Source: R/upstream_downstream.R

Function returns the river network consisting of all upstream segments from the specified river segment.

upstream(HSnetwork, ID, riverID = "riverID")

Arguments

HSnetwork

a HSnetwork (routed river network) object obtained with river_network.
ID

The ID of the segment for which the upstream river network is returned.
riverID

A character string which specifies the name of the column in river containing unique river network identifiers. Defaults to "riverID".

Value

The input HSnetwork object consisting of only upstream segments.