Acta Geodaetica et Cartographica Sinica >

2017 , Vol. 46 >Issue 11: 1891 - 1898

DOI: https://doi.org/10.11947/j.AGCS.2017.20170080

An Algorithm Creating Thumbnail for Web Map Services Based on Information Entropy and Trans-scale Similarity

  • CHENG Xiaoqiang ,
  • YANG Min ,
  • GUI Zhipeng ,
  • AI Tinghua ,
  • WU Huayi
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  • 1. Faculty of Resources and Environmental Science, Hubei University, Wuhan 430062, China;
    2. Key Laboratory of Urban Land Resources Monitoring and Simulation, Ministry of Land and Resources, Shenzhen 518034, China;
    3. School of Resource and Environmental Science, Wuhan University, Wuhan 430079, China;
    4. School of Remote Sensing and Information Engineering, Wuhan 430079, China;
    5. State Key Laboratory of Information Engineering in Surveying, Mapping and Remote Sensing, Wuhan 430079, China

Received date: 2017-02-02

  Revised date: 2017-08-18

  Online published: 2017-12-05

Supported by

The National Natural Science Foundation of China (Nos. 41501443; 41371372) The Open Research Fund of Key Laboratory of Space Utilization, Chinese Academy of Sciences (No. LSU-SJLY-2017-02) The Open Fund of Key Laboratory of Urban Land Resources Monitoring and Simulation, Ministry of Land and Resources (No. KF-2016-02-020)

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Abstract

Thumbnail can greatly increase the efficiency of browsing pictures,videos and other image resources and improve the user experience prominently. Map service is a kind of graphic resource coupling spatial information and representation scale,its crafting,retrieval and management will not function well without the support of thumbnail. Sophisticated designed thumbnails bring users vivid first impressions and help users make efficient exploration. On the contrast,coarse thumbnail cause negative emotion and discourage users to explore the map service positively. Inspired by video summarization,key position and key scale of web map service were proposed. Meanwhile,corresponding quantitative measures and an automatic algorithm were drawn up and implemented. With the help of this algorithm,poor visual quality,lack of map information and low automation of current thumbnails was solved successfully. Information entropy was used to determine areas richer in content and tran-scale similarity was calculated to judge at which scale the appearance of the map service has changed drastically,and finally a series of static pictures were extracted which can represent the content of the map service. Experimental results show that this method produced medium-sized,content-rich and well-representative thumbnails which effectively reflect the content and appearance of map service.

Key words： web map service; key scale; thumbnail; information entropy; similarity

Cite this article

CHENG Xiaoqiang , YANG Min , GUI Zhipeng , AI Tinghua , WU Huayi . An Algorithm Creating Thumbnail for Web Map Services Based on Information Entropy and Trans-scale Similarity[J]. Acta Geodaetica et Cartographica Sinica, 2017 , 46(11) : 1891 -1898 . DOI: 10.11947/j.AGCS.2017.20170080

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