A method for rapid transmission of multi-scale vector river data via the Internet

A method for rapid transmission of multi-scale

vector river data via the Internet

Yang Weifang1，2and Jonathon Li21School of Civil Engineering，Lanzhou Jiaotong University，Lanzhou 730070，China 2Department of Geography and Environmental Management，University of Waterloo N2L 3G1，Canada

【摘 要】Abstract:Due to the conflict between huge amount of map data and limited network bandwidth，rapid transmission of vector map data over the Internet has become a bottleneck of spatial data delivery in web-based environment.This paper proposed an approach to organizing and transmitting multi-scale vector river network data via the Internet progressively.This approach takes account of two levels of importance，i.e.the importance of river branches and the importance of the points belonging to each river branch，and forms data packages according to these.Our experiments have shown that the proposed approach can reduce 90%of original data while preserving the river structure well.

【期刊名称】大地测量与地球动力学（英文版） 【年(卷),期】2012(003)002 【总页数】8

【关键词】Key words:vector river data;multi-scale;progressive transmission;river structure