JTS空间坐标Geometry使用

Geomtery子类图


创建Geometry

1. GeometryFactory geometryFactory = JTSFactoryFinder.getGeometryFactory();
3. // 点
4. Coordinate coord = new Coordinate(1, 1);
5. Point point = geometryFactory.createPoint(coord);
7. // 线
8. Coordinate[] coordinates =  new Coordinate[] {new Coordinate(0, 2), new Coordinate(2, 0), new Coordinate(8, 6) };
9. LineString line = geometryFactory.createLineString(coordinates);
11. // 面
12. Coordinate[] coords  =  new Coordinate[] {new Coordinate(4, 0), new Coordinate(2, 2), new Coordinate(4, 4), new Coordinate(6, 2), new Coordinate(4, 0) };
13. LinearRing ring = geometryFactory.createLinearRing(coords);
14. LinearRing holes[] = null; // use LinearRing[] to represent holes
15. Polygon polygon = geometryFactory.createPolygon(ring, holes);
17. // 圆
18. CurvedGeometryFactory curvedFactory = new CurvedGeometryFactory(geometryFactory, Double.MAX_VALUE);
19. CoordinateSequence coords =  PackedCoordinateSequenceFactory.DOUBLE_FACTORY.create(new double[] {10, 14, 6, 10, 14, 10}, 2);
20. CircularString arc = (CircularString) curvedFactory.createCurvedGeometry(coords);

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Geometry转换坐标系

1. CoordinateReferenceSystem sourceCRS = CRS.decode("EPSG:4326");
2. CoordinateReferenceSystem targetCrs = CRS.decode("EPSG:4490");
4. boolean lenient = true; // allow for some error due to different datums
5. MathTransform transform = CRS.findMathTransform(sourceCRS, targetCrs, lenient);
7. Geometry geometry2 = JTS.transform(geometry, transform);

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Geometry方法

1. // 空间判断
2. // 不相交
3. boolean disjoint = geometry.disjoint(geometry2);
4. // 相交
5. boolean intersects = geometry.intersects(geometry2);
6. // 相切，内部不相交
7. boolean touches = geometry.touches(geometry2);
10. // 被包含
11. boolean within = geometry.within(geometry2);
12. //包含，只针对几何内部而言，不计算边界
13. boolean contains = geometry.contains(geometry2);
14. //覆盖，不区分集合边界与内部
15. boolean covers = geometry.covers(geometry);
17. //相交，不能是相切或者包含
18. boolean crosses = geometry.crosses(geometry);
19. //相交
20. boolean overlaps = geometry.overlaps(geometry2);
21. // 两个几何的空间关系
22. IntersectionMatrix relate1 = geometry.relate(geometry2);
24. //空间计算
25. //求交集
26. Geometry intersection = geometry.intersection(geometry2);
27. //求并集
28. Geometry union = geometry.union(geometry);
29. //geometry-交集
30. Geometry difference = geometry.difference(geometry2);
31. // 并集-交集
32. Geometry symDifference = geometry.symDifference(geometry);
33. // 几何缓冲生成新几何
34. Geometry buffer1 = geometry.buffer(2);
35. // 生成包含几何的最小凸多边形
36. Geometry convexHull = geometry.convexHull();
37. // 两个几何的最小距离
38. double distance = geometry.distance(geometry);
40. // 面积
41. double area = geometry.getArea();
42. //几何类型
43. String geometryType = geometry.getGeometryType();
44. // 边界
45. Geometry boundary = geometry.getBoundary();
46. // 获取中心点
47. Point centroid = geometry.getCentroid();

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Geometry 与 WKT 转换

1. // geometry转wkt
2. //方法一
3. WKTWriter2 wktWriter2 = new WKTWriter2()
4. String wkt = wktWriter2.write(geometry)
5. //方法二
6. String text = geometry.toText();
9. // wkt转geometry
10. WKTReader2 wktReader2 = WKTReader2()
11. Point point = (Point) wktReader2.read("POINT (1 1)");
13. LineString line = (LineString) wktReader2.read("LINESTRING(0 2, 2 0, 8 6)");
15. Polygon polygon = (Polygon) wktReader2.read("POLYGON((20 10, 30 0, 40 10, 30 20, 20 10))");

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pom.xml

1. <dependencies>
2.         <dependency>
3.             <groupId>org.geotools</groupId>
4.             <artifactId>gt-shapefile</artifactId>
5.             <version>${geotools.version}</version>
6.         </dependency>
7.         <dependency>
8.             <groupId>org.geotools</groupId>
9.             <artifactId>gt-epsg-hsql</artifactId>
10.             <version>${geotools.version}</version>
11.         </dependency>
12.     </dependencies>
13.   <repositories>
14.     <repository>
15.       <id>osgeo</id>
16.       <name>OSGeo Release Repository</name>
17.       <url>https://repo.osgeo.org/repository/release/</url>
18.       <snapshots><enabled>false</enabled></snapshots>
19.       <releases><enabled>true</enabled></releases>
20.     </repository>
21.     <repository>
22.       <id>osgeo-snapshot</id>
23.       <name>OSGeo Snapshot Repository</name>
24.       <url>https://repo.osgeo.org/repository/snapshot/</url>
25.       <snapshots><enabled>true</enabled></snapshots>
26.       <releases><enabled>false</enabled></releases>
27.     </repository>
28.   </repositories>

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