I. INTRODUCTION
The symbolic database system is the basic tool of
geospatial data representation in map. In the past, many
researchers didn’t focus on 3D map symbols but mostly on 2D
map symbols. In 3D GIS, all geographic phenomena and
spatial entities need to be represented by the corresponding 3D
symbol models. So establishing a complete set of 3D map
symbolic database with expression becomes critical in
technology development of 3D map visualization.