geoserver wmts服务de叠加

由于项目需求，在发布的地图服务的基础上，在其上面叠加一层路网数据，类似arcgis的服务叠加。简单介绍一下geoserver wtms服务叠加。

geoserver 发布两个地图切片服务分别为test1:test1_linegroup和test1:test1_pointgroup。

test1:是工作空间

test1_linegroup：图层组

test1_pointgroup：图层组

format:一定要是image/png格式的。

1. wmtsService.as

package com.components
{
	
	import com.esri.ags.SpatialReference;
	import com.esri.ags.Units;
	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.collections.ArrayCollection;
	import mx.controls.Alert;
	import mx.rpc.events.FaultEvent;
	import mx.rpc.events.ResultEvent;
	import mx.rpc.http.HTTPService;
	
	/**
	 * WmtsService
	 */
	public class WmtsService extends TiledMapServiceLayer
	{
	 
		public var layer:String ="";//图层服务名称(test1:test1_linegroup,test1:test1_pointgroup)
		public var _baseURL:String =  "http://192.168.1.1:8087/geoserver/gwc/service/wmts";
		public var xmin:Number = 128.79232675837919;
		public var ymin:Number = 47.34172740765266;
		public var xmax:Number = 128.95826184300616;
		public var ymax:Number = 47.46246064418352;
 
		public var _tileInfo:TileInfo = new TileInfo();

		public function WmtsService()
		{
			
	              super();
	              buildTileInfo(); 
		     etLoaded(true); // Map will only use loaded layers 
		}
 
		
		private var _fullExtent:Extent = new Extent(128.79232675837919,47.34172740765266,128.95826184300616,47.46246064418352 ,new SpatialReference(4326));
	     
		/**
		 * @private
		 */
		override public function get fullExtent():Extent
		{
			return _fullExtent;
		}
		 
		private var _initialExtent:Extent = new Extent(128.79232675837919,47.34172740765266,128.95826184300616,47.46246064418352 ,new SpatialReference(4326));
       
		/**
		 * @private
		 */
		override public function get initialExtent():Extent
		{
			return _initialExtent;
		}
		 
		
		private var _spatialReference:SpatialReference = new SpatialReference(4326);
		
		 
		override public function get spatialReference():SpatialReference
		{
			return _spatialReference;
		}
		 
		
		
		/**
		 * @private
		 */
		override public function get tileInfo():TileInfo
		{
			return _tileInfo;
		}
		
	  
		override public function get units():String
		{
			return  Units.DECIMAL_DEGREES;
		}
 
		override protected function getTileURL(level:Number, row:Number, col:Number):URLRequest
		{
 
			var url:String = _baseURL 
				+ "?SERVICE=WMTS&VERSION=1.0.0&REQUEST=GetTile" + "&LAYER="+layer+"" + "&STYLE=null" + "&FORMAT=image/png" + "&TILEMATRIXSET=test1gridset"
				+ "&TILEMATRIX=test55gridset:" + level
				+ "&TILEROW=" + row
				+ "&TILECOL=" + col ;
			return new URLRequest(url);
			
		}
		 
 
		
		public function buildTileInfo():void
		{
			
			_tileInfo.dpi = 96;
			_tileInfo.spatialReference = new SpatialReference(4326);
			_tileInfo.height = 256;
			_tileInfo.width = 256;
			_tileInfo.format = "image/png";//一定是png格式的
			_tileInfo.origin = new MapPoint(118.79232675837919,37.46246064418352);
            _tileInfo.lods=    [ 
            
               new LOD(0,0.0006481839243241,257698.22998623073), 
				       new LOD(1,0.000324091962162,128849.11499309549),
			         new LOD(2,0.000162045981081,64424.55749654774),
				 	     new LOD(3,0.0000810229905405,32212.27874827387),
				       new LOD(4,0.0000405114952703,16106.139374156812),
				  	   new LOD(5,0.0000202557476352,8053.069687098286), 
 				 	     new LOD(6,0.0000101278738176,4026.534843549143),
 				 	     new LOD(7,0.0000050639369088,2013.2674217745714), 
 					     new LOD(8,0.0000025319684544,1006.6337108872857),
					     new LOD(9,0.0000012659842272,503.31685544364285) 
					 
                ];
                   
	 			
		}
	}
	
}

2.MapTT.mxml

<?xml version="1.0" encoding="utf-8"?>
<s:Application xmlns:fx="http://ns.adobe.com/mxml/2009" 
			   xmlns:s="library://ns.adobe.com/flex/spark" 
			   xmlns:mx="library://ns.adobe.com/flex/mx" 
			   xmlns:esri="http://www.esri.com/2008/ags"
			  
			   minWidth="955" minHeight="600">
	
	
	<fx:Script>
		<![CDATA[
		 
			import com.components.WmtsService;
			 
			import com.esri.ags.Graphic;
			import com.esri.ags.layers.GraphicsLayer;
			import com.esri.ags.layers.Layer;
			import com.esri.ags.layers.supportClasses.LOD;
			
			import mx.controls.Alert;
			import mx.events.FlexEvent;
			import mx.rpc.events.FaultEvent;
			import mx.rpc.events.ResultEvent;
			import mx.rpc.http.HTTPService;
 
			public var _baseURL:String ="";// "http://192.168.1.1:8087/geoserver/gwc/service/wmts";
 
			protected function myMap_initializeHandler(event:FlexEvent):void
			{
				
				var wmts1:WmtsService=new WmtsService();
				var wmts2:WmtsService=new WmtsService();
				wmts1.layer = "test1:test1_linegroup";
				wmts2.layer = "test1:test1_pointgroup";
				this.myMap.addLayer(wmts1);
				
				this.myMap.addLayer(wmts2);
				 
			}
			
			
		]]>
	</fx:Script>
	<fx:Declarations>
		<!-- 将非可视元素（例如服务、值对象）放在此处 -->
	</fx:Declarations>
	
	
	
	
	<mx:VBox width="100%" height="100%">
		
		<esri:Map id="myMap"   zoomSliderVisible="true"    logoVisible="false" scaleBarVisible="false" 
				  initialize="myMap_initializeHandler(event)"   >
			
		</esri:Map>
	</mx:VBox>
	
</s:Application>