标签:openlayers3 openlayers ol3 wms
概述:
本节讲述如何在Ol3中加载wms图层并显示到地图中。
Ol3下载:
你可以在OL官网去下载,下载地址为http://openlayers.org/download/,也可以去我的百度云盘下载,下载地址为http://pan.baidu.com/s/1o6wwHTo。官网上的最新版本为3.6.0,我的网盘的版本为3.0.0,不过官网上的链接好像是失效的。
OL3必须资源引入:
OL3必须引入的资源有两个,一个为样式文件,ol.css;一个为js文件,ol.js。
OL3加载wms:
在Ol3中,可以通过两种方式加载WMS,一种是ol.layer.Image,其对应的资源为ol.source.ImageWMS,他它的定义方式为:
var untiled = new ol.layer.Image({ source: new ol.source.ImageWMS({ ratio: 1, url: 'http://localhost:8081/geoserver/lzugis/wms', params: {'FORMAT': format, 'VERSION': '1.1.1', LAYERS: 'lzugis:province', STYLES: '' } }) });
一种是ol.layer.Tile,其对应的资源为ol.source.TileWMS,它的定义方式为:
var tiled = new ol.layer.Tile({ visible: false, source: new ol.source.TileWMS({ url: 'http://localhost:8080/geoserver/lzugis/wms', params: {'FORMAT': format, 'VERSION': '1.1.1', tiled: true, LAYERS: 'lzugis:province', STYLES: '' } }) });
OL3中显示资源使用Map实现的,一个Map实例包括target,即地图展示的div的id;layers,地图要现实的图层集合;view,包括投影,中心点等信息,定义方式为:
var map = new ol.Map({ controls: ol.control.defaults({ attribution: false }), target: 'map', layers: [ untiled, tiled ], view: new ol.View({ projection: projection, rotation: Math.PI / 6 }) }); map.getView().fitExtent(bounds, map.getSize());
<html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <title>Ol3 wms</title> <link rel="stylesheet" type="text/css" href="http://localhost/ol3/css/ol.css"/> <style type="text/css"> body, #map { border: 0px; margin: 0px; padding: 0px; width: 100%; height: 100%; font-size: 13px; } </style> <script type="text/javascript" src="http://localhost/ol3/build/ol.js"></script> <script type="text/javascript" src="http://localhost/jquery/jquery-1.8.3.js"></script> <script type="text/javascript"> function init(){ var format = 'image/png'; var bounds = [73.4510046356223, 18.1632471876417, 134.976797646506, 53.5319431522236]; var untiled = new ol.layer.Image({ source: new ol.source.ImageWMS({ ratio: 1, url: 'http://localhost:8081/geoserver/lzugis/wms', params: {'FORMAT': format, 'VERSION': '1.1.1', LAYERS: 'lzugis:province', STYLES: '' } }) }); var tiled = new ol.layer.Tile({ visible: false, source: new ol.source.TileWMS({ url: 'http://localhost:8080/geoserver/lzugis/wms', params: {'FORMAT': format, 'VERSION': '1.1.1', tiled: true, LAYERS: 'lzugis:province', STYLES: '' } }) }); var projection = new ol.proj.Projection({ code: 'EPSG:4326', units: 'degrees' }); var map = new ol.Map({ controls: ol.control.defaults({ attribution: false }), target: 'map', layers: [ untiled, tiled ], view: new ol.View({ projection: projection, rotation: Math.PI / 6 }) }); map.getView().fitExtent(bounds, map.getSize()); } </script> </head> <body onLoad="init()"> <div id="map"> <div id="location"></div> </div> </body> </html>
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标签:openlayers3 openlayers ol3 wms
原文地址:http://blog.csdn.net/gisshixisheng/article/details/46756459