geotools中的空间关系（Geometry Relationships）和空间操作（Geometry Operations）

概述：

本文讲述geotools中的空间关系判断（Geometry Relationships）和空间操作（Geometry Operations）的编码实现。

空间关系（Geometry Relationships）：

常见的空间关系（Geometry Relationships）包括：Disjoint、Intersects、Touches、Crosses、Within、Contains、Overlaps、Relates。

空间操作（Geometry Operations）：

常见的空间操作（Geometry Operations）包括：Buffer、Intersection、ConvexHull、Intersection、Union、Difference、SymDifference。

代码实现：

1、测试数据

			String wktPoint = "POINT(103.83489981581 33.462715497945)";
			String wktLine = "LINESTRING(108.32803893589 41.306670233001,99.950999898452 25.84722546391)";
			String wktPolygon = "POLYGON((100.02715479879 32.168082192159,102.76873121104 37.194305614622,107.0334056301 34.909658604412,105.96723702534 30.949603786713,100.02715479879 32.168082192159))";
			String wktPolygon1 = "POLYGON((96.219409781775 32.777321394882,96.219409781775 40.240501628236,104.82491352023001 40.240501628236,104.82491352023001 32.777321394882,96.219409781775 32.777321394882))";

测试数据地图展示如下：

2、空间关系

			
			GeometryFactory geometryFactory = JTSFactoryFinder.getGeometryFactory( null );
			WKTReader reader = new WKTReader( geometryFactory );
			Point point = (Point) reader.read(wktPoint);
			LineString line = (LineString) reader.read(wktLine);
			Polygon polygon = (Polygon) reader.read(wktPolygon);
			Polygon polygon1 = (Polygon) reader.read(wktPolygon1);
			System.out.println("-------空间关系判断-------");
			System.out.println(polygon.contains(point));
			System.out.println(polygon.intersects(line));
			System.out.println(polygon.overlaps(polygon1));

控制台输出结果如下：

3、空间操作

			System.out.println("\r\n-------空间计算-------");
			WKTWriter write = new WKTWriter();
			Geometry intersection = polygon.union( polygon1 );
			Geometry union = polygon.union( polygon1 );
			Geometry difference = polygon.difference( polygon1 );
			Geometry symdifference = polygon.symDifference( polygon1 );
			System.out.println("\t+++++++++++叠加分析+++++++++++");
			System.out.println(write.write(intersection));
			System.out.println("\t+++++++++++合并分析+++++++++++");
			System.out.println(write.write(union));
			System.out.println("\t+++++++++++差异分析+++++++++++");
			System.out.println(write.write(difference));
			System.out.println("\t+++++++++++sym差异分析+++++++++++");
			System.out.println(write.write(symdifference));

控制台输出结果如下：

空间操作的计算结果展示如下：

intersect

union

Difference

SymDifference

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