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International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, Vol XXXV, Part B2. Istanbul 2004
DEM are extracted. Together with the contours and the newly
measured spot heights the revised DEM is generated. This
means that the elevation model is the last component to be
created within one revision cycle.
7. SUMMARY AND CONCLUSION
Different strategies are applied to the revision of the databases
that make up the TOPIODK. The objects of the geometry part
are revised in 5 years cycle — and for certain objects by an
administrative procedure giving temporary object registrations
being confirmed through the systematic 5 years revision. The
elevation model is subsequently updated utilising the revised
geometry and the photogrammetrically measured spot heights.
The database containing information on place names and points
of interest is continuously updated depending on importance
and application of the information.
The performance of the TOPIODK databases is highly
dependent on external data providers, either as subcontractors
or as partners. There is always close contact between the
photogrammetric companies and KMS during the revision
process. An optimal revision is based on confidence and co-
operation. It has proven a successful strategy that minimises the
efforts for final in-house control.
Extended co-operation with external data providers concerning
administrative revision for both temporary geometry and
information on place names and point of interest is promising
and is obviously leading to better performance of the geo-
spatial databases.
REFERENCES
Ekholm, S., 1996. A full coverage, high-resolution, topographic
model of Greenland, computed from a variety of digital
elevation data. J. Geophys. Res., pp. 21.961 — 21.972.
European Environmental Agency, 2004. INSPIRE Scoping
Paper.
Frederiksen, P., 1987. A Digital Elevation Model for Radio
Communication. In: ISPRS Proceedings of The International
Colloquium, Progress in Terrain Modelling, Copenhagen,
Denmark, pp. 127 —133.
Hoejholt, P. and J. Grum, 1999. Revision of Maps Registrating
only True Changes. In: Proceedings of 19" International
Cartographie Conference, Ottawa, Canada.
Hoejholt, P., 2004. Personal Communication.
Kamper, J. 2004. Control Procedures for Topographic Map
Databases Set-up and Update. In: Proceedings of ISPRS XX"
Congress. Istanbul, Turkey.
Nielsen, S. R., Christensen, S. F. and Michaelsen, P. B., 2002.
Topographic Mapping in Denmark. In: The Danish Way.
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