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International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, Vol XXXV, Part B2. Istanbul 2004
event, the type of the updated object and the object which has to
be changed, and thresholds for the attribute and gcometry
changes. Conflict situations which can not be handled
automatically by the system are stored and after the processing
graphically presented to an user in order that he can decide to
solve a conflict situation interactively or by changing the update
rule set. The update propagation will be repeated until we have
reached the final representation level (in our case the
DLM1000). The rule based system which controls the update
process will be part of the federation layer in the MRDB.
Object changed
Change Event
DLM1000
DLM250
BaseDLM DLM5O
Figure 8. Update propagation in the MRDB.
6. CONCLUSION
In this paper we have described the structure of an MRDB
system based on Oracle and ESRI software that establish a
consistent data structure for topographic data sets in Germany,
and the possibility of propagating updates and thus greatly
simplifying the update process. For now we have no complete
system implemented. We have implemented the MRDB
database schema, some matching tools, some generalisation
tools, and a graphical user interface. In the moment we are
implementing the automatic update system based on the
described schema. Additionally the matching and generalisation
tools are extended to cover all object and geometry types of
ATKIS.
7. REFERENCES
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metrischen Konflikten in der Generalisierung von
Polygonmosaiken, MSc Thesis, Department of Geography,
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Bédard, Y. and Bernier, E. 2002. Supporting multiple
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Scale Representations of Spatial Data, Ottawa, Canada.
Conrad, S., 1997. Fôderierte Datenbanksysteme : Konzepte der
Datenintegration. Springer-Verlag, Berlin.
Devogele, T., Trevisan, J. and Raynal, L., 1996. Building a
Multiscale Database with Scale-Transition Relationships: In
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Sheth, A. and Larson, J., 1990. Federated Database Systems for
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Heterogeneous, and
Weibel, R. & Dutton, G., 1999, Generalising spatial data and
dealing with multiple representations. In: P.A. Longley, M.F.
Goodchild, D.J., Maguire & D.W. Rhind, editors, Geographic
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1,. John Wiley & Sons, 2 edition, pp. 125-155.
8. ACKNOWLEDGEMENT
The funding of the Federal Agency of Cartography and
Geodesy, Germany, is gratefully acknowledged.
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