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The paper proposed a Quadtree-based vector data structure which supports multi-representation of geographic data: Zoom Quadtree, it aims to meet the requirement of vector-based WebGIS in efficient ret...
Terrain data is important data source in the 3D geographic visualization system. The key problem to browse global terrain data in network environment is to organize, transform and display data in a q...
Since the moment Google Earth launched by Google company, the subject of geographic information system (GIS in short) has made great progress. While, the traditional two-dimensional and three-dimensio...
There are hundreds of spatial reference frame (SRF) being applied, and the great difference among SRFs has blocked the share of global data on planet Earth. A conceptual spheroid of radius 12,800km a...
Light detection and ranging (LiDAR) is a technology capable of measuring geo-referenced coordinate of object points in a straightforward way. It has been widely used in mapping projects in last 20 yea...

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