如何将标记添加到ArcGIS地图(Silverlight)

时间:2011-05-09 15:28:42

标签: silverlight arcgis mappoint

我正在通过Silverlight API教我自己的arcGIS地图工作,我试图在XY示例中做一个简单的放置标记符号,但是如果我不能让它工作的话就会觉得它!我使用以下示例页面作为参考,但是当我去调试这个东西时,无论MapPoint的X和Y值是什么,我的标记总是会终止地图的死点:

http://blogs.esri.com/dev/blogs/silverlightwpf/archive/2010/12/14/adding-gps-location-to-the-map-in-the-arcgis-api-for-windows-phone.aspx

我的xaml看起来如下:

<UserControl x:Class="CustomGeometry.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"
    xmlns:esri="clr-namespace:ESRI.ArcGIS.Client;assembly=ESRI.ArcGIS.Client"
    mc:Ignorable="d"
    d:DesignHeight="300" d:DesignWidth="400">

    <Grid x:Name="LayoutRoot" Background="White">
        <esri:Map x:Name="mapWells" Loaded="mapWells_Loaded">
            <esri:ArcGISTiledMapServiceLayer x:Name="BaseLayer" ID="Base Map" Url="http://services.arcgisonline.com/ArcGIS/rest/services/World_Street_Map/MapServer" />
        </esri:Map>
    </Grid>
</UserControl>

我的后端代码如下所示:

  public partial class MainPage : UserControl
    {

        public MainPage()
        {
            InitializeComponent();
        }
        /// <summary>
        /// creating Wells Layer
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void mapWells_Loaded(object sender, RoutedEventArgs e)
        {
            GraphicsLayer wellsLayer = mapWells.Layers["WellsLayer"] as GraphicsLayer;
            if (wellsLayer == null)
            {
                wellsLayer = new GraphicsLayer()
                {
                    ID = "wellsLayer"
                };
                mapWells.Layers.Add(wellsLayer);

                Graphic marker = new Graphic();
                marker.Symbol = new SimpleMarkerSymbol();
                wellsLayer.Graphics.Add(marker);
            }
            // map point not being set correctly.
            MapPoint location = new MapPoint(-122.466903686523, 48.7440490722656, mapWells.SpatialReference);
            wellsLayer.Graphics[0].Geometry = location;

        }
    }

我做错了什么?我假设它与spatialReference有关,但地图空间参考为空。救命啊!

1 个答案:

答案 0 :(得分:1)

发现了这个问题。虽然通过示例说明GeographicToWebMercator是可选的,但显然不是。当我更换线

wellsLayer.Graphics[0].Geometry = location;

wellsLayer.Graphics[0].Geometry = ESRI.ArcGIS.Client.Bing.Transform.GeographicToWebMercator(location);

地图标记移动到基于我的地图点的位置,因为虽然纬度和经度对于给定的Spacial参考系统可能是正确的,但是bing map系统必须将这些值转换为它知道如何在目前的预测。

希望这有助于其他人!