ArcGIS Silverlight API访问天地图服

天地图服务是经过缓存的数据，所以需要继承的是TiledMapServiceLayer；继承的这个图层，需要收集到以下几个信息：
n Tiling Scheme Origin
n 切图的范围，也就是FullExtent
n SpatialReference
n TileInfo，包括切图的大小，级数，以及每级的Resolution
n 最后就是重写GetTileUrl方法
当地图控件的范围改变时，能够获取到当前范围的信息，那么只要把左上角和右下角之间的Tile全部按顺序显示出来就行了。

天地图图层（TDTTileLyr）重载TiledMapServiceLayer

public class TDTTileLyr : TiledMapServiceLayer
{
public override void Initialize()
{

        this.FullExtent = new        ESRI.ArcGIS.Client.Geometry.Envelope(-180, -90, 180, 90);        {            SpatialReference = new ESRI.ArcGIS.Client.Geometry.SpatialReference(4326);        };        this.SpatialReference = new ESRI.ArcGIS.Client.Geometry.SpatialReference(4326);        this.TileInfo = new TileInfo()        {            Height = 256,            Width = 256,            Origin = new ESRI.ArcGIS.Client.Geometry.MapPoint(-180,90)            {                SpatialReference = new ESRI.ArcGIS.Client.Geometry.SpatialReference(4326)            },            Lods = new Lod[16]        };        TileInfo.Lods[0] = new Lod() { Resolution = 0.703125 };        TileInfo.Lods[1] = new Lod() { Resolution = 0.3515625 };        TileInfo.Lods[2] = new Lod() { Resolution = 0.17578125 };        TileInfo.Lods[3] = new Lod() { Resolution = 0.087890625 };        TileInfo.Lods[4] = new Lod() { Resolution = 0.0439453125 };        TileInfo.Lods[5] = new Lod() { Resolution = 0.02197265625 };        TileInfo.Lods[6] = new Lod() { Resolution = 0.010986328125 };        TileInfo.Lods[7] = new Lod() { Resolution = 0.0054931640625 };        TileInfo.Lods[8] = new Lod() { Resolution = 0.00274658203124999 };        TileInfo.Lods[9] = new Lod() { Resolution = 0.001373291015625 };        TileInfo.Lods[10] = new Lod() { Resolution = 0.0006866455078125 };        TileInfo.Lods[11] = new Lod() { Resolution = 0.000343322753906249 };        TileInfo.Lods[12] = new Lod() { Resolution = 0.000171661376953125 };        TileInfo.Lods[13] = new Lod() { Resolution = 0.0000858306884765626 };        TileInfo.Lods[14] = new Lod() { Resolution = 0.0000429153442382813 };        TileInfo.Lods[15] = new Lod() { Resolution = 0.0000214576721191406 };        base.Initialize();    }    private string _url = "";    public override string GetTileUrl(int level, int row, int col)    {        string url = _url + "&X=" + col.ToString() + "&Y=" + row.ToString() + "&L=" + level.ToString();        return url;    }    public string Url    {        get        {            return _url;        }        set        {            _url = value;        }    }}

访问天地图影像切片服务
TDTTileLyr p = new TDTTileLyr();
p.Url = “http://tile0.tianditu.com/DataServer?T=sbsm0210“;
p.ID = “YINGXIANG”;
p.Visible = true;
mainMap.Layers.Add(p);
点击图片可在新窗口打开

访问天地图矢量切片服务
TDTTileLyr p = new TDTTileLyr();
p.Url = ” http://tile0.tianditu.com/DataServer?T=A0512_EMap“;
p.ID = “SHILIANG”;
p.Visible = true;
mainMap.Layers.Add(p);
点击图片可在新窗口打开

影像服务、注记服务叠加显示
//注记
TDTTileLyr p = new TDTTileLyr();
p.Url = “http://tile0.tianditu.com/DataServer?T=A0610_ImgAnno“;
p.ID = “ZJ”;
p.Visible = true;
//影像服务
TDTTileLyr p1 = new TDTTileLyr();
p1.Url = “http://tile0.tianditu.com/DataServer?T=sbsm0210“;
p1.ID = “YINGXIANG”;
p1.Visible = true;
mainMap.Layers.Add(p1);
mainMap.Layers.Add(p);

天地图服务资源
http://www.tianditu.com/guide/resource.jsp
天地图影像服务地址
http://tile0.tianditu.com/DataServer?T=sbsm0210 （1-10级）
http://tile0.tianditu.com/DataServer?T=e11 （11级）
http://tile0.tianditu.com/DataServer?T=e12 （12级）
http://tile0.tianditu.com/DataServer?T=e13 （13级）
http://tile0.tianditu.com/DataServer?T=eastdawnall （14级）
http://tile0.tianditu.com/DataServer?T=sbsm1518 （15-18级）
初始范围：111.9, 27.85, 114.25, 28.67
天地图矢量地图服务地址
http://tile0.tianditu.com/DataServer?T=A0512_EMap （1-10级）
http://tile0.tianditu.com/DataServer?T=B0627_EMap1112 （11-12级）
http://tile0.tianditu.com/DataServer?T=siwei0608 （13-18级）

天地图影像注记服务地址
http://tile0.tianditu.com/DataServer?T=A0610_ImgAnno （中文地名注记）
http://tile0.tianditu.com/DataServer?T=A0104_ImgAnnoE （英文地名注记）
http://tile0.tianditu.com/DataServer?T=siweiAnno68 （注记）

天地图矢量注记服务地址
http://tile0.tianditu.com/DataServer?T=AB0512_Anno （中文地名注记）
http://tile0.tianditu.com/DataServer?T=AB0106_AnnoE （英文地名注记）