1-4-4 
For the logical navigation of an aircraft on the named taxi way 
system the accuracy is between the values mentioned above if a 
map matching technology is used. 
7 COST FOR THE DATABASE 
The costs for a database are mainly dependent of the quality 
defined in the data specification. The costs to build a database can 
be divided into several blocks. Here the data integration out of 
different data sources again shows new cost blocks. 
Out of experience it is advantageous to use a conform information 
base for all airports to guarantee equal quality. 
The information flow to keep the database up to date is a cost 
block which can be handled separately as well. 
8 DATA ACQUISITION METHODS 
The paper maps used up to now are cartographic products where 
the topologic information is mapped. The geometry is not bad in 
general, but nobody can give a quality information due to the fact 
that this was not forced in the traditional requirements. 
The GIS systems of the airport will give also very much 
information. But for each airport the data has to be transformed 
individually. This data source is nevertheless very important to 
check the data and to update the data. For the setup of the 
database it has to be checked carefully if the transformation 
method is the best. 
Usually satellite picture have a weak contrast in the apron. But 
the geometry has a defined quality. The combination of the 
defined quality of satellite pictures and the topological 
information of the distributed paper maps is an suitable 
information pool to create an airport database useable for some 
navigation purposes. 
9 RESULTS OF A TEST DATABASE 
In a student paper at the university of Stuttgart an airport database 
was created out of the data conglomeration taken from satellite 
pictures and official paper maps. 
Picture 4: Part of the Taxiway Network of the Frankfurt Airport 
Using the map matching technology of IAGB this database has a 
sufficient quality for driving in the outer taxiway network and 
prevent so-called runway intrusions. 
10 INFORMATION QUALITY - A RISK FACTOR / 
IMPROVEMENT 
A major principle in the safety strategies in air transportation is 
the separation of aircrafts. In combination with communication 
information about the present traffic on the airport may be 
transferred to each aircraft using the aircraft type and the logical 
position in the taxiway network. This is controlled on the airport 
tower. 
Also without changing the infrastructure of the airport the safety 
will be increased if the pilot is assisted by finding the way to the 
parking position using the right way. 
11 SUMMARY 
A potentially payable database creation method is described. By 
the navigation with this database map matching techniques and 
communication are increasing safety on airports. The kill criteria 
costs for the databases could lose their relevance by using a 
cheap database. 
12 REFERENCES 
[Mohlenbrink, 1998] Mohlenbrink, W., 1998. Traffic Guidance 
and Information Systems - New Technologies for the 
Geoinformation Market. Symposium on Geodesy for geotechnical 
and Structural Engineering, April 1998, Eisenstadt bei Wien 
[GDF, 1996], 1996. GDF Specification 3.0 CEN WG 278 
[Okeke, 1998] Okeke, F., 1998. Search and Match Algorithm, 
intern Paper IAGB.