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
publicclassTDTTileLyr : TiledMapServiceLayer
{
publicoverridevoid 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 = newTileInfo()
{
Height = 256,
Width = 256,
Origin = new ESRI.ArcGIS.Client.Geometry.MapPoint(-180,90)
{
SpatialReference = new ESRI.ArcGIS.Client.Geometry.SpatialReference(4326)
},
Lods = newLod[16]
};
TileInfo.Lods[0] = newLod() { Resolution =0.703125 };
TileInfo.Lods[1] = newLod() { Resolution =0.3515625 };
TileInfo.Lods[2] = newLod() { Resolution =0.17578125 };
TileInfo.Lods[3] = newLod() { Resolution =0.087890625 };
TileInfo.Lods[4] = newLod() { Resolution =0.0439453125 };
TileInfo.Lods[5] = newLod() { Resolution =0.02197265625 };
TileInfo.Lods[6] = newLod() { Resolution =0.010986328125 };
TileInfo.Lods[7] = newLod() { Resolution =0.0054931640625 };
TileInfo.Lods[8] = newLod() { Resolution =0.00274658203124999 };
TileInfo.Lods[9] = newLod() { Resolution =0.001373291015625 };
TileInfo.Lods[10] = newLod() { Resolution =0.0006866455078125 };
TileInfo.Lods[11] = newLod() { Resolution =0.000343322753906249 };
TileInfo.Lods[12] = newLod() { Resolution =0.000171661376953125 };
TileInfo.Lods[13] = newLod() { Resolution =0.0000858306884765626 };
TileInfo.Lods[14] = newLod() { Resolution =0.0000429153442382813 };
TileInfo.Lods[15] = newLod() { Resolution =0.0000214576721191406 };
base.Initialize();
}
privatestring _url = “”;
publicoverridestring GetTileUrl(int level,int row,int col)
{
string url = _url + “&X=” + col.ToString() + “&Y=” +row.ToString() + “&L=” + level.ToString();
return url;
}
publicstring Url
{
get
{
return_url;
}
set
{
_url = value;
}
}
}
访问天地图影像切片服务
TDTTileLyr p = newTDTTileLyr();
p.Url = “http://tile0.tianditu.com/DataServer?T=sbsm0210″;
p.ID= “YINGXIANG”;
p.Visible = true;
mainMap.Layers.Add(p);
访问天地图矢量切片服务
TDTTileLyr p = newTDTTileLyr();
p.Url = ” http://tile0.tianditu.com/DataServer?T=A0512_EMap”;
p.ID= “SHILIANG”;
p.Visible = true;
mainMap.Layers.Add(p);
影像服务、注记服务叠加显示
//注记
TDTTileLyr p = newTDTTileLyr();
p.Url = “http://tile0.tianditu.com/DataServer?T=A0610_ImgAnno”;
p.ID= “ZJ”;
p.Visible = true;
//影像服务
TDTTileLyr p1 = newTDTTileLyr();
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）
@L_404_3@（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）
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