Feature DefinitionsΒΆ

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 0 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 Bifukation

    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

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
  1. Self Intersection

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

    _images/self_intersection.png

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