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				@@ -61,6 +61,12 @@ 
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				 				layerID: '', //底图切换唯一ID 
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				 				layerList: [], //图层列表 
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				+				baseMapData: { 
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				+					url: "https://server.arcgisonline.com/arcgis/rest/services/World_Imagery/MapServer/tile/{z}/{y}/{x}", 
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				+					minimumLevel: 1, 
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				+					maximumLevel: 18 
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				+				}, 
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				+ 
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				 				//地形数据 
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				 				terrainData: { 
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				 					isterrain: false, //是否切换地形 
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				@@ -140,6 +146,8 @@ 
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				 				}).then(res => { 
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				 					let options = { 
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				 						url: url, //服务地址 
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				+						minimumLevel: this.baseMapData.minimumLevel, 
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				+						maximumLevel: this.baseMapData.maximumLevel 
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				 					}; 
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				 					if (url.indexOf("map.geoq.cn") != -1) { 
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				 						options.CRS = "WGS84"; 
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				@@ -197,7 +205,7 @@ 
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				 						if (item.parameterset instanceof Object) { 
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				 							parameterset = item.parameterset; 
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				 						} else if (item.parameterset != "" && item.parameterset != null && item.parameterset != undefined) { 
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				-							 
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				+ 
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				 							parameterset = JSON.parse(item.parameterset); 
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				 						} 
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				@@ -226,6 +234,8 @@ 
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				 							//设置参数 
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				 							let options = { 
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				 								url: item.datasource, //服务地址 
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				+								minimumLevel: _self.baseMapData.minimumLevel, 
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				+								maximumLevel: _self.baseMapData.maximumLevel 
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				 							}; 
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				 							if (item.datasource.indexOf("map.geoq.cn") != -1) { 
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				 								options.CRS = "WGS84"; 
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