Aerodrome Surface Routing Network (ASRN)

An Aerodrome Surface Routing Network (ASRN) is a geographic graph network which can be used for generating taxi paths around airports. An ASRN is made up of two AMDB Layers:

• AsrnNodes - Points which can represent important locations such as stands, holding points, or act as connections between areas such as runways, taxiways, or aprons. These are split into subtypes by their nodetype property:
  • Taxiway Nodes
  • Holding Position Nodes
  • Runway Boundary Nodes
  • Runway Exit Line Nodes
  • Runway Intersection Nodes
  • Apron Boundary Nodes
  • Taxiway Link Nodes
  • Stand Nodes
• AsrnEdges - Linestrings which form connections between nodes, and can represent important paths such as runway centerlines, stand entry/exit lines, runway entry/exit lines, or taxiways. These are also split into subtypes, however they all have the same properties.

Each AsrnEdge connects two AsrnNodes, these can be found using the node1ref and node2ref properties on the edge, which points to the id field on the AsrnNodes. Using only these properties, a pathfinding algorithm can find its way between any two nodes in a given airports ASRN.

The ASRN for London Heathrow Airport (EGLL)

In this documentation, the AsrnNode layer is split into multiple pages for each nodetype as they have different properties, and have different implications.