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ISO 17572-1-2015 pdf free download
ISO 17572-1-2015 pdf free download.Intelligent transport systems (ITS) Location referencing for geographic databases Part 1:General requirements and conceptual model
Systèmes intelligents de transport (SIT) — Localisation pour bases de donnéesgéographiques — Partie 1: Exigencesgénérales et modèle conceptuel.
4.2 Requirements of the location referencing method
In addition to the goals, some minimal requirements shall make the different location referencing methods feasible for the foreseen categories of locations (see 5,4).
One of the most important data characteristics for ITS applications is spatial accuracy. Spatial accuracy is an aspect of data quality and Is described In GDF in the following way: The shape of a level 0 edge including all positions on the segment as a whole shall not have any position that diverges from the real shape more than an allowed error. Spatial data accuracy requirements for ITS vary according to the application. This means not just categories of applications but how an application works operationally. Some applications, notably those for advanced vehicle safety systems, would require very accurate data. Even within a particular application, requirements for different levels of data accuracy might exist and will be subject to change as applications and products evolve. The spatial data accuracy requirements impact on the location referencing method chosen for an application.
One fundamental requirement across all methods is that, whichever method is used, use of that method does not result in additional spatial location error beyond that already present in the data. However, for the location referencing of area information, for example weather information or information specifying a zone of environmental contamination, some positional error Is permitted due to the imprecise (fuzzyN) nature of such information. The key requirement for such references Is that they be made with sufficient precision to allow the user to avoid the area or take other appropriate action. Specifically, it is a requirement that:
R-1. An LRM and the process of its operation shall not introduce a supplementary position error relative to that specified in the database from which the reference is generated. The location reference should be conveyed with spatial and temporal accuracy sufficient to enable the vehicle or user to identify the (spatial) extent of the location.
For certain locations, knowing the side of the road or block on which the location is found can be very important to the user. For example, crossing a road to a location on the opposite side might not be possible for vehicles or pedestrians in some road lane configurations without additional routing. whereas turning into a location on the same side can be easily accomplished. Therefore, it is a particular requirement that:
R-2. The LRM shall enable referencing of the relative spatial relationship of objects.
In addition to spatial accuracy requirements. location referencing methods have functional requirements regarding topological relationships, for example that a point is on one side of an object or that many points shall be ordered in a certain way along a road. For example, for locations referenced by positions along a logical or physical route, the ordering of points shall be preserved by the reference. For location referencing, the requirement is that:
R-3. The LRM shall not change the topological relationships within a set of point data by its own action, limitation, or deficiency.ISO 17572-1-2015 pdf free download.
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