Figure 2From: An approach for aggregating upstream catchment information to support research and management of fluvial systems across large landscapesAn illustration shows the stream units in two types of digital stream networks. (a) a polyline example, (b) a polygon example. This also illustrates that upstream landscape summary of S1 is a combination of local information at unit S1, and upstream information at units S2, S3, S4, and S5. Similar statement is applied to (b) with a polygon example.Back to article page