A Real-time Generalization and Multi-scale Visualization Method for POI Data in Volunteered Geographic Information

• Main Authors: YANG Min, AI Tinghua, LU Wei, CHENG Xiaoqiang, ZHOU Qi
• Format: Article
• Language: zho
• Published: Surveying and Mapping Press 2015-02-01
• Series: Acta Geodaetica et Cartographica Sinica
• Subjects: urban facility POI; multi-scale visualization; volunteered geographic information; real-time generalization
• Online Access: http://xb.sinomaps.com:8081/Jwk_chxb/CN/10.11947/j.AGCS.2015.20130564

With the development of mobile and Web technologies, there has been an increasing number of map-based mushups which display different kinds of POI data in volunteered geographic information. Due to the lack of suitable mechanisms for multi-scale visualization, the display of the POI data often result in the icon clustering problem with icons touching and overlapping each other. This paper introduces a multi-scale visualization method for urban facility POI data by combing the classic methods of generalization and on-line environment. Firstly, we organize the POI data into hierarchical structure by preprocessing in the server-side; the POI features then will be obtained based on the display scale in the client-side and the displacement operation will be executed to resolve the local icon conflicts. Experiments show that this approach can not only achieve the requirements of real-time online, but also can get better multi-scale representation of POI data.