Common Logical Data Model: Basis for Global ITS Innovation
are made up of their own set of industry
experts that have common business
interests to quickly develop documents to
address specific industry needs. Already,
these groups have developed over 1,000 ITS
standards, specifications and other
documents, and this number continues to
grow. While some cross-pollination of
innovative ideas occur, coordination among
groups is challenging due to travel costs,
copyright issues and the need for timely
products versus the time required to build
broad consensus. As a result, various groups
often develop similar terms and data
definitions that can lead to confusion when
comparing materials from different sources.
In some cases, these differences can
potentially have safety implications. For
example, while the industry has generally
agreed on using WGS-84 30 latitude and
longitude at a one tenth of a micro-degree
resolution (which provides roughly one-
centimeter resolution), there are still
aspects of ambiguity around location data
including:
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Where is the reference location of a
car? Most European standards place
this at the “front-center” of the
vehicle while American standards
place this as the “middle center.”
The industry needs a way to identify
these variations among standards
along with clear rules on how to
transform data in one format to
another.
Does the mapping information
reflect current conditions? In other
words, the data has to support all
operational scenarios including the
use of movable barriers, changes to
infrastructure due to collisions and
other scenarios that change the
roadway geometry or roadway
furniture. Vehicles traversing the
network have to be aware of current
conditions as they change.
How accurate is the data for
stationary objects and maps? While
vehicles will be equipped with global
navigation satellite system (GNSS)
receivers, stationary roadside
elements (i.e., curbs, parking spaces,
etc.) are likely to be positioned once
and left to advertise their location as
needed. However, as tectonic plates
slowly (or at times quickly) shift, this
data becomes less reliable. The
industry needs clear guidelines on
how to handle these types of
anomalies that are so easy to
overlook; specifically, the industry
needs a central resource that can be
used to share best practices among
the different standardization bodies.
This paper introduces efforts by ISO to
overcome these issues by promoting the
development of an industry-wide logical
data model.
T HE I MPORTANCE OF D ATA S HARING
More and more attention has been paid to
safety, comfort, mitigation of impacts on the
environment and energy efficiency in
World Geodetic System, https://www.unoosa.org/pdf/icg/2012/template/WGS_84.pdf
IIC Journal of Innovation
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