ArcGIS API for Silverlight中加載Google地形圖（瓦片圖）

在作水利、氣象、土地等行業中，若能使用到Google的地形圖那是再合適不過了，下面就介紹如何在ArcGIS API for Silverlight中加載Google地express

<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>

三、Silverlight項目中的MainPage.xaml.cs文件內容以下：微信

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);
        }
    }
}

四、完成以上步驟後，運行，能夠看見Google地形圖了，just try it，have fun！ide

五、補充：這裏使用的是墨卡託座標，而咱們常常使用的是經緯度座標，這就須要作轉換，下面提供一個類，WKIDConvert.cs，內容函數

以下：this

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
    {
        //經緯度轉墨卡託
        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;
        }

        //墨卡託轉經緯度
        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;
        }
    }
}

而後咱們若是要定位到某個城市的話，好比黃山市，其Extent爲：117.647738815324,29.4704217183843,118.446182957997,30.4124245048916google

咱們這裏爲MainPage.xaml.cs中添加一行代碼便可定位到黃山市範圍url

private void UserControl_Loaded(object sender, RoutedEventArgs e)
{
spa

GoogleTopographicLayer layer = new GoogleTopographicLayer();
rest

myMap.Layers.Add(layer);
myMap.Extent = new Envelope(WKIDConvert.lonlat2mercator(new MapPoint(117.647738815324, 29.4704217183843)), WKIDConvert.lonlat2mercator(new MapPoint(118.446182957997, 30.4124245048916)));
}

六、再次補充：在以前的Google地形圖上疊加自定義ArcMap地圖，能夠是動態圖也能夠是靜態圖，只要加上發佈的地圖，便可顯示，在MainPage.xaml.cs中添加以下幾行代碼便可。

private void UserControl_Loaded(object sender, RoutedEventArgs e)
{
            //疊加Google地形圖瓦片
            GoogleTopographicLayer layer = new GoogleTopographicLayer();
            myMap.Layers.Add(layer);
            layer.Opacity = 1;

            //加載動態圖
            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, 29.4704217183843)), WKIDConvert.lonlat2mercator(new MapPoint(118.446182957997, 30.4124245048916)));
}

效果圖以下，這裏只是作了黃山市的市界邊線，主要做用就是在Google地形圖上明顯看出黃山市的範圍：

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