Digi Points

Digi points are the georeferencing of a reach, and are defined in cases when the reach is not a straight line between two nodes. A reach can have from two to any number of digi points, though the first and last digi point should (approximately) match the coordinate of the nodes (if not, coordinates of the nodes are added as the first/last digi points).

Each digi point has a (x,y) geographical coordinate and a reach chainage. The chainage defines the location of this digi point along the reach. In effect a digi point couples a reach location to a geographical (x,y) coordinate.

A digi point can also specify a z coordinate, in which case it defines the bottom level of the reach. If the cross section data also specifies a bottom level, the cross section bottom level overrules the digi point bottom level.