• ArcGIS API For Silverlight使用在线地图的多种方法总结


    引自:http://www.cnblogs.com/meimao5211/p/3283969.html

    ArcGIS API For Silverlight使用在线地图的多种方法总结 本人也正在学习ArcGIS API For Silverlight,希望通过博文和大家相互交流、学习,如有不对请及时指正~
    最近,主要在研究如何将在线地图叠加到Silverlight中,当然没有啥原创,只是总结了现在普遍存在的一些方法。
    (1)使用自带的ESRI.ArcGIS.Client.Toolkit.DataSources.dll。只要按装ArcGIS API For Silverlight即可调用。主要是调用OpenStreetMap,适合做城市人文方面的信息展示,因为有大量的道路,交通数据。前端XAML代码如下:


    1 xmlns:esri="clr-namespace:ESRI.ArcGIS.Client;assembly=ESRI.ArcGIS.Client"
    2
    3 xmlns:open="clr-namespace:ESRI.ArcGIS.Client.Toolkit.DataSources;assembly=ESRI.ArcGIS.Client.Toolkit.DataSources"
    4
    5          <esri:Map x:Name="MyMap">
    6             <esri:Map.Layers>
    7                 <open:OpenStreetMapLayer ID="MyLayer"></open:OpenStreetMapLayer>
    8             </esri:Map.Layers>
    9         </esri:Map>
    效果如下:

    (2)使用Portable Basemap Server,这是一个免安装的WPF程序,来加载各种数据源作为底图图层,直接为更多的客户端API提供一致风格的REST底图服务,从而使开发人员免去为每个应用程序自定义图层的麻烦。具体内容可以查看这里。
    使用如下:

    直接使用Rest接口访问即可,前端代码如下:


             <esri:Map x:Name="MyMap">
                 <!--<esri:Map.Layers>
                     <open:OpenStreetMapLayer ID="MyLayer"></open:OpenStreetMapLayer>
                 </esri:Map.Layers>-->
                 <esri:ArcGISTiledMapServiceLayer Url="http://10.10.83.95:7080/PBS/rest/services/GoogleMapsRoad/MapServer" ></esri:ArcGISTiledMapServiceLayer>
             </esri:Map>
    (3)当在做水文,气象等专题GIS时需要使用google的地形图,这里使用暖风无敌的方法,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。
    首先建立一个名为”GoogleTopographicLayer“的类
     


    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。
     
    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:sdk="http://schemas.microsoft.com/winfx/2006/xaml/presentation/sdk"
        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>
    后台代码如下:


    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);
            }
        }
    }

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  • 原文地址:https://www.cnblogs.com/changbaishan/p/5722663.html
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