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Digital Road Map: Different Applications Fig. 1.1
K TELE ATLAS K7/PDK650920 e4
In section 2 the European digital road map MultiMap is
explained in details, including its data model, data content
(collected objects and their attributes), data quality, data
collection and updating concept. The integration of
Photogrammetry and Remote Sensing into GIS plays more
and more important role in our discipline, which is also
adopted in the production of MultiMap. The data capture by
digitization of digital orthoimages is depicted and
discussed, taking Austria and Switzerland projects as
examples. In Section 3 several applications based on
MultiMap are presented, which concern the production of
navigable CD-ROM's for the in-vehicle navigation systems
like Blaupunkt TravelPilot, Mercedes-Benz Autopilot and
Audi navigation system, navigation system Blaupunkt
TravelPilot, Multimedia travel guides, StreetNet,
StreetMap and StreetPilot. Finally the future work is
summarized with emphasis on the rapid completion of the
digital road map for the whole Western Europe.
2. MultiMap - European Digital Road Map
2.1 Data Model, Data content and quality
In MultiMap the world is modelled with complex features,
simple features and geometric primitives, which are
topologically structured in 2-dimensional vector form,
described by their attributes and, depending on concrete
situations, connected by well defined relations. Geometric
primitives are nodes, edges and faces which refer to the
coordinate level and are basic components of topology.
The simple features are on the next level and represent the
semantical objects, which are either points, lines or areas.
Finally complex features are aggregated from one or more
simple and/or complex ones.
All traffic-related information such as roads, railways,
political boundaries, waters, town centers, train stations
and airports, together with their attributes and relations, is
captured. Roads are classified and attributes like one way,
banned turns, access roads, barriers, bridges, tunnels,
over- and underpasses are collected additionally for them.
For data exchange (exporting and importing) the
internationally accepted standard GDF (Geographic Data
File) is utilized, which is an ASCII file containing
983
geographical data structured in a standardized way
(Claussen, 1995b).
The quality of the digital maps is the most important factor
for all kinds of application and judged by the geometrical
accuracy, topological consistency, correctness (of attribute
values, object classification and object relations),
completeness and up-to-datenese (Claussen, 1995a).
Among all these parameters, the geometrical accuracy is
most clearly defined, depending on scales, accuracies of
source materials and on the production process, while the
definition of the other parameters are more or less
connected with uncertainty. The quality is determined by
the statistical sampling approach.
2.2 Data capture and updating concept
Process Flow: Digital Map Production Fig. 2.1
3. Quality Check
M TELE ATLAS RBDG/MDP60119 e1
In co-operation with surveying and mapping authorities,
official digital and analog maps as well as orthoimages in
scales 1: 2 500 or 1: 5 000 (for STNW - street networks)
and 1: 25 000 (for ICNW - interconnecting networks) are
made available for data capture. Negotiation over buying
source map materials for data acquisition is very complex
as to the aspects of copyrights and specifications. In order
to keep the number of negotiation partners as few as
possible and start our projects without unnecessary delay,
we looked first for organizations which have homogeneous
map works covering large areas with the same scales and
object sets etc. and fulfilling the quality requirements of
International Archives of Photogrammetry and Remote Sensing. Vol. XXXI, Part B4. Vienna 1996
