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This paper describes a multi-touch GIS(Geography Information System) based on optical and computer vision. In the system, user can operates map directly through gesture. A series of image processing and computation of video frames is used to get data and trajectory of touch point according to the characteristics of touch point. Some multi-touch gestures corresponding to typical GIS operation and its state transition model are defined. According to these definitions, a gesture recognition method based on geometric characteristics of trajectory is given. This method can recognize the trajectory into correct interaction gestures and operate the GIS through MapX.

Multi-touch GIS Based on Optical and Computer Vision