experimental

Six vector maps are selected as experimental data. These maps are referred to as the coastline map, river map, building map, green land map, road map and waterway map, as shown in Fig. 9. The coastline map and river map, both in the China Geodetic Coordinate System 2000 (CGCS2000), can be downloaded from the website of the National Catalogue Service for Geographic Information of China (https://www.webmap.cn). The building map, the green land map and the road map, which are in local coordinate system, are obtained from a surveying and mapping institute in China. The waterway map is available from the OpenStreetMap website (http://download.geofabrik.de). 

本实验选取6幅矢量地图作为试验数据，分别为海岸线地图、河流地图、建筑地图、绿地地图、道路地图与航道地图，如图9所示。其中，海岸线地图与河流地图采用中国2000大地坐标系（China Geodetic Coordinate System 2000，CGCS2000），可从中国国家地理信息公共服务平台官网（https://www.webmap.cn）下载；建筑地图、绿地地图与道路地图采用地方坐标系，数据来源于国内一家测绘院所；航道地图则可通过OpenStreetMap平台（http://download.geofabrik.de）获取。