在做水利、气象、土地等行业中，若能使用到Google的地形图那是再合适不过了，下面就介绍如何在ArcGIS API for Silverlight中加载Google地
形图。先上一个图，初步制作，待后续继续改进
ArcGIS API for Silverlight 中的ArcGISTiledMapServiceLayer图层，继承自TiledMapServiceLayer。如果想实现自己的缓存地图图 层，继承它并重载GetTileUrl方法就可以了。 ArcGIS API for Silverlight 内部会计算当前访问的缩放等级level，切片二维编号row， col。这些参数暴露给GetTileUrl方法，在这个方法里面设置访问Google静态地图的URL地址。 1、在Silverlight项目中新建一个文件夹，并添加一个名为GoogleTopographicLayer.cs文件，内容如下：
using System;using System.Net;using System.windows;using System.windows.Controls;using System.windows.documents;using System.windows.Ink;using System.windows.input;using System.windows.Media;using System.windows.Media.Animation;using System.windows.Shapes;using ESRI.ArcGIS.ClIEnt;using ESRI.ArcGIS.ClIEnt.Geometry;namespace GoogleMap.CommonClass{ public class GoogletopographicLayer: TiledMapServiceLayer { private const double cornerCoordinate = 20037508.3427892; private string _baseURL = "t@128"; //Google地形图 public overrIDe voID Initialize() { ESRI.ArcGIS.ClIEnt.Projection.WebMercator mercator = new ESRI.ArcGIS.ClIEnt.Projection.WebMercator(); this.FullExtent = new ESRI.ArcGIS.ClIEnt.Geometry.Envelope(-20037508.3427892,-20037508.3427892,20037508.3427892,20037508.3427892) { SpatialReference = new SpatialReference(102100) }; //图层的空间坐标系 this.SpatialReference = new SpatialReference(102100); // 建立切片信息，每个切片大小256*256px，共16级. this.TileInfo = new TileInfo() { Height = 256,WIDth = 256,Origin = new MapPoint(-cornerCoordinate,cornerCoordinate) { SpatialReference = new ESRI.ArcGIS.ClIEnt.Geometry.SpatialReference(102100) },Lods = new Lod[16] }; //为每级建立方案，每一级是前一级别的一半. double resolution = cornerCoordinate * 2 / 256; for (int i = 0; i < TileInfo.Lods.Length; i++) { TileInfo.Lods[i] = new Lod() { Resolution = resolution }; resolution /= 2; } // 调用初始化函数 base.Initialize(); } public overrIDe string GetTileUrl(int level,int row,int col) { string url = "http://mt" + (col % 4) + ".Google.cn/vt/lyrs=" + _baseURL + "&v=w2.114&hl=zh-CN&gl=cn&" + "x=" + col + "&" + "y=" + row + "&" + "z=" + level + "&s=galil"; if (_baseURL == "s@92") { url = "http://mt" + (col % 4) + ".Google.cn/vt/lyrs=" + _baseURL + "&v=w2.114&hl=zh-CN&gl=cn&" + "x=" + col + "&" + "y=" + row + "&" + "z=" + level + "&s=galil"; //加载Google遥感图 } if (_baseURL == "t@128") { url = "http://mt" + (col % 4) + ".Google.cn/vt/lyrs=" + _baseURL + ",r@169000000&v=w2.114&hl=zh-CN&gl=cn&" + "x=" + col + "&" + "y=" + row + "&" + "z=" + level + "&s=galil";//加载Google地形图 } if (_baseURL == "m@161000000") { url = "http://mt" + (col % 4) + ".Google.cn/vt/lyrs=" + _baseURL + "&v=w2.114&hl=zh-CN&gl=cn&" + "x=" + col + "&" + "y=" + row + "&" + "z=" + level + "&s=galil"; //加载Google街道图 } return string.Format(url); //调用加载初始的Google街道地图 //string baseUrl = "http://mt2.Google.cn/vt/v=w2.116&hl=zh-CN&gl=cn&x={0}&y={1}&z={2}&s=G"; //return string.Format(baseUrl,col,row,level); } }}//以上显示的Google地图类型，有三种，根据需要，可以修改变量_baseURL的初始值即可。 2、Silverlight项目中的MainPage.xaml文件内容如下：
<UserControl x:Class="GoogleMap.MainPage" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:d="http://schemas.microsoft.com/Expression/blend/2008" xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" mc:Ignorable="d" xmlns:esri="http://schemas.esri.com/arcgis/clIEnt/2009" xmlns:controlsToolkit="clr-namespace:System.windows.Controls;assembly=System.windows.Controls.Toolkit" xmlns:sdk="http://schemas.microsoft.com/winfx/2006/xaml/presentation/sdk" xmlns:layer="clr-namespace:GoogleMap.CommonClass" d:DesignHeight="300" d:DesignWIDth="400" Loaded="UserControl_Loaded"> <GrID x:name="LayoutRoot" Background="White"> <esri:Map x:name="myMap" IslogoVisible="False" ZoomDuration="0:00:02" PanDuration="0:00:02"> </esri:Map> </GrID></UserControl>
3、Silverlight项目中的MainPage.xaml.cs文件内容如下：
using System;using System.Collections.Generic;using System.linq;using System.Net;using System.windows;using System.windows.Controls;using System.windows.documents;using System.windows.input;using System.windows.Media;using System.windows.Media.Animation;using System.windows.Shapes;using TestDZX.CommonClass;using ESRI.ArcGIS.ClIEnt.Geometry;using ESRI.ArcGIS.ClIEnt;namespace GoogleMap{ public partial class MainPage: UserControl { ESRI.ArcGIS.ClIEnt.Projection.WebMercator mercator = new ESRI.ArcGIS.ClIEnt.Projection.WebMercator(); public MainPage() { InitializeComponent(); } private voID UserControl_Loaded(object sender,RoutedEventArgs e) { GoogletopographicLayerlayer = new GoogletopographicLayer(); myMap.Layers.Add(layer); } }} 4、完成以上步骤后，运行，可以看见Google地形图了，just try it，have fun！
5、补充：这里使用的是墨卡托坐标，而我们经常使用的是经纬度坐标，这就需要做转换，下面提供一个类，WKIDConvert.cs，内容
如下：
using System;using System.Net;using System.windows;using System.windows.Controls;using System.windows.documents;using System.windows.Ink;using System.windows.input;using System.windows.Media;using System.windows.Media.Animation;using System.windows.Shapes;using ESRI.ArcGIS.ClIEnt.Geometry;namespace GoogleMap.CommonClass{ public static class WKIDConvert { //经纬度转墨卡托 public static MapPoint lonlat2mercator(MapPoint lonlat) { MapPoint mercator = new MapPoint(); double X = lonlat.X * 20037508.34 / 180; double Y = Math.Log(Math.Tan((90 + lonlat.Y) * Math.PI / 360)) / (Math.PI / 180); Y = Y * 20037508.34 / 180; mercator.X = X; mercator.Y = Y; return mercator; } //墨卡托转经纬度 public static MapPoint mercator2lonlat(MapPoint mercator) { MapPoint lonlat = new MapPoint(); double X = mercator.X / 20037508.34 * 180; double Y = mercator.Y / 20037508.34 * 180; Y = 180 / Math.PI * (2 * Math.atan(Math.Exp(Y * Math.PI / 180)) - Math.PI / 2); lonlat.X = X; lonlat.Y = Y; return lonlat; } }} 然后我们如果要定位到某个城市的话，比如黄山市，其Extent为：117.647738815324,29.4704217183843,118.446182957997,30.4124245048916
我们这里为MainPage.xaml.cs中添加一行代码即可定位到黄山市范围
private voID UserControl_Loaded(object sender,RoutedEventArgs e)
{
GoogletopographicLayer layer = new GoogletopographicLayer();
myMap.Layers.Add(layer);
myMap.Extent = new Envelope(WKIDConvert.lonlat2mercator(new MapPoint(117.647738815324,29.4704217183843)),WKIDConvert.lonlat2mercator(new MapPoint(118.446182957997,30.4124245048916)));
}
6、再次补充：在之前的Google地形图上叠加自定义ArcMap地图，可以是动态图也可以是静态图，只要加上发布的地图，即可显示，在MainPage.xaml.cs中添加如下几行代码即可。
private voID UserControl_Loaded(object sender,RoutedEventArgs e)
{
//叠加Google地形图瓦片
GoogletopographicLayer layer = new GoogletopographicLayer();
myMap.Layers.Add(layer);
layer.Opacity = 1;
//加载动态图
ESRI.ArcGIS.ClIEnt.ArcGISDynamicMapServiceLayer dLayer = new ESRI.ArcGIS.ClIEnt.ArcGISDynamicMapServiceLayer();
myMap.Layers.LayersInitialized += (evtsender,args) =>
{
myMap.ZoomTo(dLayer.InitialExtent);
};
dLayer.Url = "http://localhost/arcgis/rest/services/HS/MapServer/";
myMap.Layers.Add(dLayer);
dLayer.Opacity = 1;
myMap.Extent = new Envelope(WKIDConvert.lonlat2mercator(new MapPoint(117.647738815324,30.4124245048916)));
}
效果图如下，这里只是做了黄山市的市界边线，主要作用就是在Google地形图上明显看出黄山市的范围：
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