Point
- Wolfgang Scheucher
- WOJTOWICZ Aleksander
- POROSNICU Eduard
A Point is a simple position to indicate the geographical location, e.g. of an airport reference point (ARP), navaid, waypoint, runway threshold, etc.
It is basically a pair of latitude/longitude coordinates.
In AIXM 5.1, simple positions are encoded using the Point or ElevatedPoint elements, which are extensions of the gml:Point:
For the ElevatedPoint class, also elevation may be specified (e.g. Elevation of the ARP or DME Antenna).
The pairs of lat/long coordinates are coded by using the gml:pos element.
The figure below gives an example of the encoding of an aerodrome reference point.
In this example the ARP element does not have a srsName defined. The CRS is defined on on a higher level, the AIXMBasicMessage, using the gml:Envelope element (see page Coordinate Reference System for more details about the usage of the srsName).
