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Navigations-CD: Principle Production Process
Fig. 3.1
street networks
software for operation
and navigation
= x
combination
‘
CD-ROM
i TELE ATLAS
- make full use of other information appearing in images
for data collection (e.g. one way etc.) in order to reduce
FDC work.
- alternatives to on-screen digitization (e.g.
photogrammetric stereo-restitution, automatic or semi-
automatic approaches).
3. Applications based on MultiMap
3.1 CD-ROM's for vehicle navigation systems
For the production of navigation CD-ROM's, the high
quality data from MultiMap, together with the navigation
software, are restructured and prepared through complex
processes (Fig. 3.1). Additionally other information like
data about tourism and entertainment facilities can also be
integrated, as is done with the CD-ROM MERIAN scout
from the tourist guides publisher Gräfe und Unzer. From
these pre-prepared data a CD-image is generated and
then burned on a CD. Such kinds of CD-ROM's are used
in the autonomous navigation systems of Blaupunkt
TravelPilot, Mercedes-Benz Autopilot and Audi navigation
system.
Currently CD-ROM's for Germany are available. On the
basis of available data, the production of navigation CD-
ROM's for Belgium, the Netherlands, Luxembourg, Great
Britain, Italy and France or some of big cities in these
regions such as London, Paris etc. are scheduled to be
completed this year. From the middle of 1996 we will be
able to supply complete CD-ROM's for Switzerland and
CD-ROM's for 4 cities (Vienna, Linz, Salzburg and Graz)
and motorways in Austria. By the end of this year complete
985
K7/L06.95d
CD-ROM's for Austria will be available. Under co-operation
with data suppliers in USA, navigation CD-ROM's for
several regions in North America are also in preparation.
Test-CD's will be available in the 1st half year of 1996 for
Atlanta and Detroit.
3.2 Navigation system TravelPilot
The Blaupunkt TravelPilot is an autonomous in-vehicle
navigation system, which works completely independent of
any infrastructure such as induction loops, electronic
beacons or cellular mobile phones (GSM), because all data
and sensors necessary for positioning and navigation are
installed in the vehicle. The important components of such
a system are: a navigation computer, a GPS-receiver, a
CD-ROM with data and software, ABS-sensors, an
electronic compass, a loudspeaker for acoustic output of
,iurn-by-turn" driving instructions, and a LC color screen for
visual display of maps, street name, driving instructions,
distance to destination, route-list, GPS-status and other
additional information (Fig. 3.2). The vehicle's motions are
registered by wheel sensors and an electronic compass.
The current position of the vehicle is determined from
incremental changes of distance and direction by means of
dead reckoning method. Position deviations accumulates
depending on the distance travelled, because the accuracy
of the sensors and applied method is limited. Hence
positioning has to be improved. This is done through a
process of map-matching, which means that dead
reckoned position is compared to a digital vector map
stored on a CD-ROM in the disk drive of the on-board
navigation computer. GPS-signals are used for the
calibration and stabilization of this positioning and matching
process or positioning in areas where no digital maps are
International Archives of Photogrammetry and Remote Sensing. Vol. XXXI, Part B4. Vienna 1996
