SCALGO Live Documentation

Understanding the river network

River networks are located at the top of the layer selection panel to the left of the SCALGO Live interface, in red boxes - one for each river network. The screenshot below shows a user accessing the "Silverlode" network.

The river network box contains a button to show the "River Network Tools" dialog (), as well as the list of map layers associated with the network. These include the river network layer itself (described below) as well as the so-called binding reports and a layer for each of the computations associated with the river network.

The Model

The river network is modelled as a network of nodes and edges with cross sections and can be visualized by selecting the "River Network" layer. Each edge corresponds to a section of the river over which the cross section is assumed to be constant. Cross sections are usually measured by surveyors in the field, but can also come from e.g. regulations data. In SCALGO Live these cross sections are extended beyond their original extent by a sampling of the terrain model. The river network itself is rendered (see figure below) as a sequence of edges displayed in alternating shades of blue. An edge goes between two green nodes.

Screenshot of the river network showing a tributary (bottom left) merging into a larger river (going from right to top left) at the orange merge node.

The cross section used to model the section of the river covered by the edge is rendered as a thin purple line. The position, orientation and length of the line represents the measured part of the cross section. If you select an edge using the select tool you can see the full length of the cross section used in computations, including the part sampled from the terrain model. If the cross section has not been measured and is sourced entirely from digitized regulations and/or the terrain model, a short purple line is shown with an orientation perpendicular to the river. An orange node is used to indicate a merge node where multiple river strings merge into one. The yellow points represent points from the external river network data where the elevation of the river bed is known.

Read more about exploring the river network.