International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, Vol XXXV, Part B4. Istanbul 2004
window efficiently. Furthermore, the VTDS provides a
geo-spatial data indexing mechanism with which one can
navigate continuously from global overviews to high-resolution
local views.
Another contribution in our approach is that the Voronoi
diagram is embedded in VTDS. Voronoi diagram between
objects at a given level can bé dynamic generalized by recursive
dilation of spherical triangles based on QTM address codes. The
adjacency relationships from Voronoi-diagram, which is
fundamental to perform queries and updates, allow the addition
or deletion of individual objects using a small set of purely local
operation.
ACKNOWLEGEMENT
The work described in this paper was substantially supported by
an Outstanding Youth Award from the Natural Science
Foundation of China (under grant No.40025101) and by CERG
project from the Research Grants Council of the Hong Kong
Special Administrative Region (Project No. PolyU 5048/98E).
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