ArcGIS Server加载sogou地图

最新推荐文章于 2021-01-09 22:17:43 发布

最新推荐文章于 2021-01-09 22:17:43 发布 · 317 阅读

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本文介绍了一种基于搜狗地图的TMS算法实现，该算法与谷歌地图类似但存在细微差别。通过代码示例详细展示了如何创建自定义的地图图块服务层，包括设置地图范围、分辨率以及获取图块URL的方法。

部署运行你感兴趣的模型镜像

搜狗地图的TMS算法与谷歌地图大同小异，但是就因为这点差异，要浪费一些时间去修改代码。不多说，直接上代码，给大家分享。

package util
{
  import com.esri.ags.SpatialReference;
  import com.esri.ags.geometry.Extent;
  import com.esri.ags.geometry.MapPoint;
  import com.esri.ags.layers.TiledMapServiceLayer;
  import com.esri.ags.layers.supportClasses.LOD;
  import com.esri.ags.layers.supportClasses.TileInfo;

  import flash.net.URLRequest;

  import mx.events.Request;

  public class SogouTileMapServiceLayer extends TiledMapServiceLayer
  {

   private var mapMinZoom:int = 1; //最小显示等级
   private var mapMaxZoom:int = 18;//最大显示等级
   //成员变量
   private var _tileInfo:TileInfo = new TileInfo(); // see buildTileInfo()
   private var tileUrls:Array = [
    "http://p0.go2map.com/seamless1/0/174/",
    "http://p1.go2map.com/seamless1/0/174/",
    "http://p2.go2map.com/seamless1/0/174/",
    "http://p3.go2map.com/seamless1/0/174/"];

   public function SogouTileMapServiceLayer()
   {
    super();

    buildTileInfo(); // to create our hardcoded tileInfo

    setLoaded(true); // Map will only use loaded layers
   }

   override public function get fullExtent():Extent
   {
    return new Extent(-180,-90,180,90, new SpatialReference(4326));
   }


   override public function get initialExtent():Extent
   {
    return new Extent(-180,-90,180,90, new SpatialReference(4326));
   }

   override public function get spatialReference():SpatialReference
   {
    return new SpatialReference(4326);
   }

     override public function get tileInfo():TileInfo
   {
    return _tileInfo;
   }

   override protected function getTileURL(zoom:Number, row:Number, col:Number):URLRequest
   {

    zoom = zoom - 2;

    var offsetX:Number = Math.pow(2,zoom);
    var offsetY:Number = offsetX - 1;

    var numX:Number = col - offsetX;
    var numY:Number = (-row) + offsetY;

    zoom = zoom + 1;

    var l:int = 729 - zoom;
    if (l == 710) l = 792;

    var blo:Number = Math.floor(numX / 200);
    var bla:Number = Math.floor(numY / 200);

    var blos:String,blas:String;
    if (blo < 0)
     blos = "M" + ( - blo);
    else
     blos = "" + blo;
    if (bla < 0)
     blas = "M" + ( - bla);
    else
     blas = "" + bla;

    var x:String = numX.toString().replace("-","M");
    var y:String = numY.toString().replace("-","M");

    var num:int = (row+col) % tileUrls.length;
    trace(l+" row:"+blos+" col: "+blas+" x: "+x+" y: "+y);

    var strURL:String = "";
    strURL = tileUrls[num] + l + "/" + blos + "/" + blas + "/" + x + "_" + y + ".GIF";

    var urlRequest:URLRequest;
    urlRequest = new URLRequest(strURL);

    return urlRequest;
   }
   private function buildTileInfo():void
   {
    //北京wgs84 墨卡托：3242230，11674840
    _tileInfo.height=256;
    _tileInfo.width=256;
    _tileInfo.origin=new MapPoint(0,0);
    _tileInfo.lods = [
     //new LOD(0, 1.4047193659, 591657527.591555),
     new LOD(1, 0.702359682, 295828763.795777),
     new LOD(2, 0.351179841, 147914381.897889),
     new LOD(3, 0.175589920, 73957190.948944),
     new LOD(4, 0.087794960372, 36978595.474472),
     new LOD(12, 0.00034294, 144447.638572),
     new LOD(13, 0.0001714745, 72223.819286),
     new LOD(14, 0.000085737265, 36111.909643),
     new LOD(15, 0.0000428686329, 18055.954822),
     new LOD(16, 0.000021434316, 9027.977411),
     new LOD(17, 0.00001071715824, 4513.988705),
     new LOD(18, 0.0000053585791250, 2256.994353),
    ];
   }

}
}