International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, Vol XXXV, Part B4. Istanbul 2004 
3. DEVELOPMENT PHASE 
AutoCAD Map provides a number of GIS functions for 
example, route finding. Our goal was to find and link the 
pictures of the junctions along the current path, therefore some 
software developments were required. AutoCAD provides the 
well-known ActiveX mechanism to manipulate entities from 
other applications. Figure 4 shows the available programming 
environment: 
vu # Goria) 
p 
  
AutoCAD ActiveX Object 
  
  
  
AutoCAD Application 
  
  
  
Figure 4. Programming environments 
Although AutoCAD has an own Basic programming 
environment (Visual Basic for Application), we have developed 
an executable application in MS Visual Basic. The software 
finds the entities (blocks) representing the insertion points of 
the pictures in a predefined buffer region along the optimal 
path. Then the program reads the attribute of the blocks as a file 
path, and shows the current image. The queried images of the 
database are extended by simple navigational instructions 
(arrows) to give additional information for the driver. From the 
orientation angles of the edges the application calculates and 
shows the direction of the next turning. In addition the program 
displays the neighbouring part of the current junction on 
topographic map. 
Image-Based Drivet's Guidance 5yste 
  
  
  
  
  
pee —ÓÓ 
i 
  
Figure 5. The graphical user interface of the application 
4. CONCLUSION 
In this paper we presented an AutoCAD Map based GIS 
software using network topology. We believe that this 
development provides more information, and gives easy-to- 
understand navigation instructions for the drivers. In the future 
we plan to automate the data collection by digital video camera 
and implement this method in a platform independent system, 
which enables the use on PDAs. 
REFERENCES 
Kirby R.F, Potts R.B. (1969): The minimum route problem for 
networks with turn penalties and prohibitions. Transport 
Research. 3, pp 397-408. 
T. Lovas (1999); GIS background of the intelligent vehicle 
navigation systems . Thesis work, BUTE. (in Hungarian) 
T. Lovas (2000): Vehicle Navigation Maps at the Turn of the 
Millennium , BUTE. 
Ziliaskopoulos A.K. and Mahmassani H.S (1996): A Note on 
Least Time Path Computation Considering Delays and 
Prohibition for Intersection Movements, Transport Research. 3, 
pp 359-367. 
J. Jiang, H.Han, J Chen (2002): Modeling turning restrictions in 
traffic network for vehicle navigation system. Ottawa, 
Symposium on Geospatial Theory, Processing and Application. 
Autodesk, Inc. (1999): ActiveX and VBA Developer’s Guide 
Autodesk, Inc. (1999): AutoCAD Map 2000 User’s Guide 
G.E. Burnett (2000): Usable Vehicle Navigation Systems: Are 
we there yet? 
http://www.cs.nott.ac.uk/~geb/VES2000-burnett.pdf 
http://www.vdodayton.de/ 
390 
CA 
KEY ' 
ABST 
Photo; 
applic: 
systen 
simpli 
In the 
for ed: 
simila 
editing 
they d 
In this 
was d 
proce 
same 1 
for fur 
semi-c 
can be 
IPCB: 
digital 
finally 
tested 
Outpu 
In tra 
after « 
be spe 
such € 
in Gl. 
but al 
systen 
editin 
humai 
In the 
other 
mode 
geom: 
cleani 
data c 
and c 
integr