ArcGIS api for javascript——合并切片和动态图层

描述

这个示例加入一个通过 ArcGISTiledMapServiceLayer表示的 cachedArcGIS Server地图服务，和一个通过 ArcGISDynamicMapServiceLayer表示的非缓存服务到同一个地图。

图层顺序由 map.addLayer方法调用的顺序决定。第一个被增加的图层被放置在下方。后来的图层放置在上面。在这个示例中，动态图层被在切片图层的上面。动态图层放置在切片图层上方是常用的方案，因为基础地图数据通常适合用ArcGIS Server的地图缓存而覆盖图经常需要修改和实时更新，因此不适合用缓存。

注意顶层图使用 setOpacity方法设置为半透明:

dynamicMapServiceLayer.setOpacity(0.5);

 1 <%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
 2 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/strict.dtd">
 3 <html>
 4   <head>
 5     <meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
 6     <meta http-equiv="X-UA-Compatible" content="IE=7" />
 7     <title>TiledMap And DynamicMap</title>
 8     <style type="text/css">
 9         @import
10         "http://serverapi.arcgisonline.com/jsapi/arcgis/1.6/js/dojo/dijit/themes/tundra/tundra.css";
11     </style>
12     <script type="text/javascript" src="http://serverapi.arcgisonline.com/jsapi/arcgis/?v=1.6"></script>
13     <script type="text/javascript">
14         dojo.require("esri.map");
15         function init(){
16             var map = new esri.Map("map");
17             //添加地图的URL,可缓存的切片地图
18             var tiledMapServiceLayer = new esri.layers.ArcGISTiledMapServiceLayer(
19                 "http://server.arcgisonline.com/ArcGIS/rest/services/NGS_Topo_US_2D/MapServer"
20             );
21             map.addLayer(tiledMapServiceLayer);
22             //非缓存地图服务URL-动态地图服务层,放在上面，并设置为半透明
23             var dynamicMapServiceLayer = new esri.layers.ArcGISDynamicMapServiceLayer(
24                 "http://sampleserver1.arcgisonline.com/ArcGIS/rest/services/Demographics/ESRI_Population_World/MapServer", {"opacity":0.5}
25             );
26             map.addLayer(dynamicMapServiceLayer);
27         }
28         dojo.addOnLoad(init);
29     </script>
30 
31   </head>
32   
33   <body class="tundra">
34     <div id="map" style="900px;height:600px;border:1px solid #000;"></div>
35     Creates a map and adds an ArcGISDynamicMapServiceLayer and an ArcGISTiledMapServiceLayer.<br>
36      Map navigation using mouse:
37     <ul>
38       <li>Drag to pan</li>
39       <li>SHIFT + Click to recenter</li>
40       <li>SHIFT + Drag to zoom in</li>
41       <li>SHIFT + CTRL + Drag to zoom out</li>
42       <li>Mouse Scroll Forward to zoom in</li>
43       <li>Mouse Scroll Backward to zoom out</li>
44       <li>Use Arrow keys to pan</li>
45       <li>+ key to zoom in a level</li>
46       <li>- key to zoom out a level</li>
47       <li>Double Click to Center and Zoom in</li>
48     </ul>
49   </body>
50 </html>