|dc.description.abstract||Abstract. In this work, we propose a dynamic, flexible and
interactive urban digital terrain platform with spatial data and
query processing capabilities of geographic information systems, multimedia database functionality and graphical modeling infrastructure. A new data element, called Geo-Node,
which stores image, spatial data and 3-D CAD objects is
developed using an efficient data structure. The system effectively handles data transfer of Geo-Nodes between main
memory and secondary storage with an optimized directional
replacement policy (DRP) based buffer management scheme.
Polyhedron structures are used in digital surface modeling
and smoothing process is performed by interpolation. The
experimental results show that our framework achieves high
performance and works effectively with urban scenes independent from the amount of spatial data and image size.
The proposed platform may contribute to the development
of various applications such as Web GIS systems based on 3-
D graphics standards (e.g., X3-D and VRML) and services
which integrate multi-dimensional spatial information and