Feature Definitions

This document describes the logic used for determining what type (if any) of feature each node represents.

1. Crossing / Kreuzung

When two lines cross each other.

_images/crossing.png

2. Pseudo node / Pseudonode

A node that has one upstream and one downstream node. The node is superflous as it can be represented by one line instead of two.

_images/pseudo_node.png

3. Well / Quelle

A node that has 1 upstream node and 0 downstream nodes.

_images/well.png

4. Sink / Senke

A node that has no upstream node and 1 or more downstream nodes.

_images/sink.png

5. Watershed / Top

A node that has more than one upstream node and 0 downstream nodes.

_images/watershed.png

6. Unseparated / Ungetrennter

Only 1 upstream node or only 1 downstream node and intersects with one or more other lines. Note that in the lines below, there is only one node under the star, the other line has no node at the position of the star.

_images/unseparated.png

7. Unclear bifurcation / Unklare Bifurkation

It has more than one upstream and more than one downstream node, but the number of upstream and downstream nodes are same.

_images/unclear_bifurcation.png

8. Tributary, Branch / Verzweigung

It has more upstream nodes than downstream nodes. The minimum number of downstream nodes is one.

_images/branch.png

9. Confluence / Zusammenfluss

It has more downstream nodes than upstream nodes. The minimum number of upstream nodes is one.

_images/confluence.png

10. Segment Center / Segmentmitte

Segment center is the linear center of a line. The tool finds the point in the line that has distance half of the length of the line.

_images/segment_center.png

11. Self Intersection / Selbstkreuzung

Same with intersection, but this time the line intersects with itself.

_images/self_intersection.png