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ArcGIS Silverlight API访问天地图服务

2013-05-09 16:02 441 查看

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);

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);

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);

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