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International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, Vol XXXV, Part B4. Istanbul 2004 
integrity rules as well as rules for transformation between the 
representations. In this context both users and the system should 
be aware of the multiple representations. Data consistency of 
different representations is enforced through appropriate, 
automatic update propagation. 
Further research is needed in many areas and will focus on the 
following aspects: 
e Functions offered by DBMSs can be readily used for 
obtaining new geometries. Next step is consistent 
organisation of new objects in the structures used for 
multi-resolution management, e.g. DBMS-views 
could be used for representing data sets using 
generalisation procedures for geometry and theme 
properties once these procedures have been 
implemented in the DBMS. 
e Data structures for management of multiple 
representations. The correspondence between spatial 
objects in a multi-representation environment has to 
be further organised in appropriate data structures. 
e Functions for consistency checks and functions for 
propagating updates between different datasets are 
needed. 
e  Generalisation procedures for geometry — 
simplifications of boundaries, changes in dimensions 
of objects, aggregation of several small objects, 
selection of significant objects need to be further 
developed. 
e  Generalisation procedures with respect to the theme: 
aggregations of geometry based on theme properties 
and computation of a new object need improvements. 
ACKNOWLEDGEMENTS 
This research is sponsored by the Rijkswaterstaat, Ministry of 
Transport and Public Works and the research programme 
Sustainable Urban Areas at OTB, Delft University of 
Technology, The Netherlands 
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