xmljava系统源码-GIS:利用OpenStreetMap(OSM)数据搭建一个地图服务

上传者: 38524851 | 上传时间: 2021-08-05 09:07:32 | 文件大小: 5.21MB | 文件类型: ZIP
xml java系统源码 GIS基础知识 GIS基本组件 地图数据库:提供地图数据,例如OSM的planet.osm可以导入PostgreSQL作为地图数据库 瓦片服务器:负责生成一系列的瓦片(tiles),这些瓦片通常为256像素的方块,瓦片组在一起形成地图。对于Google Map,瓦片服务器是Google提供的,用户不能接触其地图数据库;对于OSM,地图数据库是开放的,可以随意下载,需要自己搭建瓦片服务器 前端API:用于浏览器JavaScript API,或者用于移动客户端的同功API。例如OpenLayers、Leaflet。 坐标参考系统(Coordinate Reference Systems) 又称空间参考系统(spatial reference system,SRS),是基于二维坐标的,用于定位局部、区域或者全球地理信息资源的体系。CRS定义了一种地图映射规则、与其它CRS之间进行转化的算法。CRS是GIS系统的基础。 最常用的两种CRS为: CRS 说明 EPSG:4326 以经纬度直接作为X(经度)、Y(维度)坐标,南纬、西经采用负数表示 投影范围: -180.0

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