Esri Leaflet 第一个例子：加载ArcGIS底图

Leaflet是一种开源的JavaScript 地图库，算是WebGIS中比较主流的地图库，轻量、插件丰富、社区活跃度高，相对来说比较成熟。就在前不久，刚发布了新版本1.3.3。

下面，将介绍如何显示ArcGIS基础底图。

首先，在加载Leaflet的代码和样式，Leaflet.js、leaflet.css；加载Esri Leaflet库： esri-leflet.js。

  <!-- lets load Leaflet's .js and .css from CDN-->
  <link rel="stylesheet" href="https://unpkg.com/[email protected]/dist/leaflet.css" />
  <script src="https://unpkg.com/[email protected]/dist/leaflet.js"></script>

  <!-- Load Esri Leaflet from CDN.  it has no .css stylesheet of its own, only .js -->
  <script src="https://unpkg.com/[email protected]/dist/esri-leaflet.js"></script>

支持的基础底图
支持ArcGIS Online的基础底图：如Streets（街道图）、Topographic（地形图）、Gray（灰色风格的地图）、DarkGray（深灰色风格的地图）。这几类底图，只需要在定义basemap图层时，指定其名字即可访问得到。

var map = L.map('map', {
      center: [28.2, 113.03],
      zoom: 8
    });

var layer = L.esri.basemapLayer(Streets).addTo(map);

完整的代码如下：

<html>
<head>
  <meta charset=utf-8 />
  <title>Showing an ArcGIS basemap</title>
  <meta name='viewport' content='initial-scale=1,maximum-scale=1,user-scalable=no' />

    <!-- Load Leaflet from CDN -->
    <link rel="stylesheet" href="https://unpkg.com/[email protected]/dist/leaflet.css"
    integrity="sha512-Rksm5RenBEKSKFjgI3a41vrjkw4EVPlJ3+OiI65vTjIdo9brlAacEuKOiQ5OFh7cOI1bkDwLqdLw3Zg0cRJAAQ=="
    crossorigin=""/>
    <script src="https://unpkg.com/[email protected]/dist/leaflet.js"
    integrity="sha512-/Nsx9X4HebavoBvEBuyp3I7od5tA0UzAxs+j83KgC8PU0kgB4XiK4Lfe4y4cgBtaRJQEIFCW+oC506aPT2L1zw=="
    crossorigin=""></script>


    <!-- Load Esri Leaflet from CDN -->
    <script src="https://unpkg.com/[email protected]/dist/esri-leaflet.js"
    integrity="sha512-6BBVttv13OVrrUSoGmy9/aIVHateyIEGFaQxqnzCgXT9LNCAQ1Cxxj43R6Eq0ynydS7a7bLLfmEWwXFiO6lW2g=="
    crossorigin=""></script>


  <style>
    body { margin:0; padding:0; }
    #map { position: absolute; top:0; bottom:0; right:0; left:0; }
  </style>
</head>
<body>

<div id="map"></div>

<script>
  var map = L.map('map', {
      center: [28.2, 113.03],
      zoom: 8
    });

  var layer = L.esri.basemapLayer('Streets').addTo(map);

</script>

</body>
</html>

最后结果显示如下：

Esri Leaflet 第一个例子：加载ArcGIS底图

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