KEYWORDS: Data processing, Image processing, 3D image processing, 3D modeling, Data modeling, Visualization, Data conversion, Computer simulations, Remote sensing, Satellite imaging
Recent advances in computer architectures, computational power and memory bandwidth have created new
opportunities for visualizing large terrain data sets. Real 3D terrain simulation results from combining two main data
set- an aerial or satellite image as terrain texture and Digital Elevation Model (DEM) as terrain. Because these data are
huge amount and in different format, it is necessary to do some prior process for terrain simulation. In this paper a data
process chain of RSG DEM and remote sensing image for 3D real terrain simulation is proposed. Then a terrain
simulation system using this process method is introduced.
KEYWORDS: Global Positioning System, Databases, Prototyping, Geographic information systems, Lithium, Data modeling, Human-machine interfaces, Data processing, Networks, Receivers
The most important and common service of LBS is to provide the user of his location. In this paper we propose a method to cluster a period of GPS data into meaningful locations by using DBSCAN algorithm. With a time window constraint this method can even distinguish the locations of the same place where the user went at different time. The learned significant locations are important basis of further service, such as predicting the user's future movement, building the user's own map etc. At last, we introduce a prototype system based on the learning method to provide the place information where the user went before and the information is expressed in time-ordered and semantic landmarks directly.
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