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);

 <%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>

 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/strict.dtd">

 <html>

   <head>

     <meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>

     <meta http-equiv="X-UA-Compatible" content="IE=7" />

     <title>TiledMap And DynamicMap</title>

     <style type="text/css">

         @import

         "http://serverapi.arcgisonline.com/jsapi/arcgis/1.6/js/dojo/dijit/themes/tundra/tundra.css";

     </style>

     <script type="text/javascript" src="http://serverapi.arcgisonline.com/jsapi/arcgis/?v=1.6"></script>

     <script type="text/javascript">

         dojo.require("esri.map");

         function init(){

             var map = new esri.Map("map");

             //添加地图的URL,可缓存的切片地图

             var tiledMapServiceLayer = new esri.layers.ArcGISTiledMapServiceLayer(

                 "http://server.arcgisonline.com/ArcGIS/rest/services/NGS_Topo_US_2D/MapServer"

             );

             map.addLayer(tiledMapServiceLayer);

             //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

             var dynamicMapServiceLayer = new esri.layers.ArcGISDynamicMapServiceLayer(

                 "http://sampleserver1.arcgisonline.com/ArcGIS/rest/services/Demographics/ESRI_Population_World/MapServer", {"opacity":0.5}

             );

             map.addLayer(dynamicMapServiceLayer);

         }

         dojo.addOnLoad(init);

     </script>

   </head>

   <body class="tundra">

     <div id="map" style="width:900px;height:600px;border:1px solid #000;"></div>

     Creates a map and adds an ArcGISDynamicMapServiceLayer and an ArcGISTiledMapServiceLayer.<br>

      Map navigation using mouse:

     <ul>

       <li>Drag to pan</li>

       <li>SHIFT + Click to recenter</li>

       <li>SHIFT + Drag to zoom in</li>

       <li>SHIFT + CTRL + Drag to zoom out</li>

       <li>Mouse Scroll Forward to zoom in</li>

       <li>Mouse Scroll Backward to zoom out</li>

       <li>Use Arrow keys to pan</li>

       <li>+ key to zoom in a level</li>

       <li>- key to zoom out a level</li>

       <li>Double Click to Center and Zoom in</li>

     </ul>

   </body>

 </html>