相较于ArcGIS API而言，Openlayers添加天地图和其他第三方的地图服务简单多了。通过ol.layer.Tile调用切片地图服务，因为天地图服务遵循TMS标准，所以在source属性中使用ol.source.XYZ类，服务地址可以在天地图中查看到。
<!DOCTYPE html>
<html lang="zh-cn">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width" />
<link rel="stylesheet" href="libs/openlayers-v3.20.0-dist/ol.css">
<script src="libs/openlayers-v3.20.0-dist/ol.js"></script>
<title></title>
<style>
html,body,#map{width:100%;height:100%}
</style>
</head>
<body>
<div id="map" class="map"></div>
</body>
<script>
var tian_di_tu_satellite_layer = new ol.layer.Tile({
title: "天地图卫星影像",
visible:false,
source: new ol.source.XYZ({
url: 'http://t4.tianditu.com/DataServer?T=img_w&x={x}&y={y}&l={z}'
})
});
var tian_di_tu_road_layer = new ol.layer.Tile({
title: "天地图路网",
source: new ol.source.XYZ({
url: "http://t4.tianditu.com/DataServer?T=vec_w&x={x}&y={y}&l={z}"
})
});
var tian_di_tu_annotation = new ol.layer.Tile({
title: "天地图文字标注",
source: new ol.source.XYZ({
url: 'http://t4.tianditu.com/DataServer?T=cva_w&x={x}&y={y}&l={z}'
})
});
var map = new ol.Map({
target: 'map',
layers: [tian_di_tu_satellite_layer, tian_di_tu_road_layer, tian_di_tu_annotation],
overlays: [],
view: new ol.View({
center: [106.52714, 29.62487],
projection: 'EPSG:4326',
zoom: 12
}),
//比例尺
controls: ol.control.defaults()
});
</script>
</html>
