OGC 12-028r1
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Copyright © 2016 Open Geospatial Consortium
i. Abstract
Starting with version 5, the Aeronautical Information Exchange Model AIXM schema began using the OGC Geographical Markup Language GML version 3.2.1 for the encoding of
positional and shape data of aeronautical information items, such as airspace, runway thresholds, navaids, etc.
The ISO 19107 spatial schema, which is implemented in GML, is very complex. ISO 19107 contains an extensive list of geometries, geometric properties and operations – many of which
are not necessary for aeronautical information applications. In addition, ISO 19107 contains an exhaustive 3D geometry model that is probably not needed in its entirety for AIXM either.
Therefore, a profile of GML for AIXM needs to be defined.
The objective of this document is to identify the elements of the AIXM-GML profile and to provide guidelines for the use of GML constructs in AIXM data sets.
ii. Keywords
The following are keywords to be used by search engines and document catalogues.
ogcdoc, OGC document, GML, AIXM, aviation profile
iii. Preface
According to the ICAO
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rules, Aeronautical Information AI is published by States using paper and increasingly electronic documents, such as Aeronautical Information Publications
AIP, charts, manuals. These data includes geographically related information items such as: ▪ Positions expressed in latitudelongitude, which according to ICAO Annex 15 shall use
a WGS-84 datum; ▪ Shapes of airspace, expressed as a series of positions in combination with arcs of circles
or as full circles. Sometimes, these shapes contain references to national borders, water courses, etc., which are not provided explicitly in the AIP;
▪ Shapes of obstacles, provided as point, line or polygon, again using a series of positions and arcs of circle.
Since 2003, the Aeronautical Information Exchange Model AIXM has been used for the provision of AI in digital format. Initially developed for the European AIS Database, AIXM
was progressively adopted by other States world-wide. From the International Civil Aviation
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International Civil Aviation Organization. http:www.icao.intPagesdefault.aspx
OGC 12-028r1
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Copyright © 2016 Open Geospatial Consortium
Organisation ICAO perspective, AIXM is positioned as a means of achieving compliance with the standards and recommended practices for digital aeronautical data exchange, as stated
in the ICAO Annex 15.
AIXM versions up to 4.5 used a custom XML encoding and did not use OGC standards. Beginning in 2008 with the publication of version 5, the AIXM specification has embraced
GML as the data encoding format.
There are a number of specific requirements in the AI Domain that concern the provision of geographical and geometrical information. These requirements are discussed in this document
and includes recommendations for data encoding in GML.
The first version of this document was developed by the OGC Aviation Domain Working Group and published as an OGC Discussion Paper OGC document reference 12-028 in May
2012. This version is an update of the original version and based on the feedback from users and the results for OGC testbed activities provides further guidance and clarifications.
The objective is the publication of this document as an OGC Best Practice document by mid- 2015
iv. Forward
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. The Open Geospatial Consortium shall not be held responsible for
identifying any or all such patent rights.
Recipients of this document are requested to submit, with their comments, notification of any relevant patent claims or other intellectual property rights of which they may be aware that
might be infringed by any implementation of the standard set forth in this document, and to provide supporting documentation.
OGC 12-028r1
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Copyright © 2016 Open Geospatial Consortium
v. Submitting organizations
Kategori