空间数据模型
判断两个几何图形是否存在指定的空间关系。包括：
相等（equals）、分离（disjoint）、相交（intersect）、相接（touches）、交叉（crosses）、包含于（within）、包含（contains）、覆盖/覆盖于（overlaps）。同时，也支持一般的关系（relate）操作符。
JTS支持的空间关系
http://www.cnblogs.com/duanxingxing/p/5144257.html
code
import org.geotools.geometry.jts.JTSFactoryFinder; import com.vividsolutions.jts.geom.Coordinate; import com.vividsolutions.jts.geom.Geometry; import com.vividsolutions.jts.geom.GeometryCollection; import com.vividsolutions.jts.geom.GeometryFactory; import com.vividsolutions.jts.geom.LineString; import com.vividsolutions.jts.geom.LinearRing; import com.vividsolutions.jts.geom.Point; import com.vividsolutions.jts.geom.Polygon; import com.vividsolutions.jts.geom.MultiPolygon; import com.vividsolutions.jts.geom.MultiLineString; import com.vividsolutions.jts.geom.MultiPoint; import com.vividsolutions.jts.io.ParseException; import com.vividsolutions.jts.io.WKTReader; /** * Class GeometryDemo.java * Description Geometry 几何实体的创建，读取操作 * Company mapbar * author Chenll E-mail: Chenll@mapbar.com * Version 1.0 * Date 2012-2-17 上午11:08:50 */ public class GeometryDemo { private GeometryFactory geometryFactory = JTSFactoryFinder.getGeometryFactory( null ); /** * create a point * @return */ public Point createPoint(){ Coordinate coord = new Coordinate(109.013388, 32.715519); Point point = geometryFactory.createPoint( coord ); return point; } /** * create a point by WKT * @return * @throws ParseException */ public Point createPointByWKT() throws ParseException{ WKTReader reader = new WKTReader( geometryFactory ); Point point = (Point) reader.read("POINT (109.013388 32.715519)"); return point; } /** * create multiPoint by wkt * @return */ public MultiPoint createMulPointByWKT()throws ParseException{ WKTReader reader = new WKTReader( geometryFactory ); MultiPoint mpoint = (MultiPoint) reader.read("MULTIPOINT(109.013388 32.715519,119.32488 31.435678)"); return mpoint; } /** * * create a line * @return */ public LineString createLine(){ Coordinate[] coords = new Coordinate[] {new Coordinate(2, 2), new Coordinate(2, 2)}; LineString line = geometryFactory.createLineString(coords); return line; } public LineString createLine(int a, int b, int c, int d){ Coordinate[] coords = new Coordinate[] {new Coordinate(a, b), new Coordinate(c, d)}; LineString line = geometryFactory.createLineString(coords); return line; } /** * create a line by WKT * @return * @throws ParseException */ public LineString createLineByWKT() throws ParseException{ WKTReader reader = new WKTReader( geometryFactory ); LineString line = (LineString) reader.read("LINESTRING(0 0, 2 0)"); return line; } /** * create multiLine * @return */ public MultiLineString createMLine(){ Coordinate[] coords1 = new Coordinate[] {new Coordinate(2, 2), new Coordinate(2, 2)}; LineString line1 = geometryFactory.createLineString(coords1); Coordinate[] coords2 = new Coordinate[] {new Coordinate(2, 2), new Coordinate(2, 2)}; LineString line2 = geometryFactory.createLineString(coords2); LineString[] lineStrings = new LineString[2]; lineStrings[0]= line1; lineStrings[1] = line2; MultiLineString ms = geometryFactory.createMultiLineString(lineStrings); return ms; } /** * create multiLine by WKT * @return * @throws ParseException */ public MultiLineString createMLineByWKT()throws ParseException{ WKTReader reader = new WKTReader( geometryFactory ); MultiLineString line = (MultiLineString) reader.read("MULTILINESTRING((0 0, 2 0),(1 1,2 2))"); return line; } /** * create a polygon(多边形) by WKT * @return * @throws ParseException */ public Polygon createPolygonByWKT() throws ParseException{ WKTReader reader = new WKTReader( geometryFactory ); Polygon polygon = (Polygon) reader.read("POLYGON((20 10, 30 0, 40 10, 30 20, 20 10))"); return polygon; } /** * create multi polygon by wkt * @return * @throws ParseException */ public MultiPolygon createMulPolygonByWKT() throws ParseException{ WKTReader reader = new WKTReader( geometryFactory ); MultiPolygon mpolygon = (MultiPolygon) reader.read("MULTIPOLYGON(((40 10, 30 0, 40 10, 30 20, 40 10),(30 10, 30 0, 40 10, 30 20, 30 10)))"); return mpolygon; } /** * create GeometryCollection contain point or multiPoint or line or multiLine or polygon or multiPolygon * @return * @throws ParseException */ public GeometryCollection createGeoCollect() throws ParseException{ LineString line = createLine(); Polygon poly = createPolygonByWKT(); Geometry g1 = geometryFactory.createGeometry(line); Geometry g2 = geometryFactory.createGeometry(poly); Geometry[] garray = new Geometry[]{g1,g2}; GeometryCollection gc = geometryFactory.createGeometryCollection(garray); return gc; } /** * create a Circle 创建一个圆，圆心(x,y) 半径RADIUS * @param x * @param y * @param RADIUS * @return */ public Polygon createCircle(double x, double y, final double RADIUS){ final int SIDES = 32;//圆上面的点个数 Coordinate coords[] = new Coordinate[SIDES+1]; for( int i = 0; i < SIDES; i++){ double angle = ((double) i / (double) SIDES) * Math.PI * 2.0; double dx = Math.cos( angle ) * RADIUS; double dy = Math.sin( angle ) * RADIUS; coords[i] = new Coordinate( (double) x + dx, (double) y + dy ); } coords[SIDES] = coords[0]; LinearRing ring = geometryFactory.createLinearRing( coords ); Polygon polygon = geometryFactory.createPolygon( ring, null ); return polygon; } /** * @param args * @throws ParseException */ public static void main(String[] args) throws ParseException { GeometryDemo gt = new GeometryDemo(); Polygon p = gt.createCircle(0, 1, 2); //圆上所有的坐标(32个) Coordinate coords[] = p.getCoordinates(); for(Coordinate coord:coords){ System.out.println(coord.x+","+coord.y); } Point pt = gt.createPoint(); System.out.println(pt.getX() + "," + pt.getY()); Point pt2 = gt.createPointByWKT(); System.out.println(pt2.getX() + "," + pt2.getY()); LineString l_1 = gt.createLine(20, 0, 30, 0); LineString l_2 = gt.createLine(20, 0, 30, 10); LineString l_3 = gt.createLine(30, 10, 30, 15); LineString l_4 = gt.createLine(20, 10, 30, 0); Polygon pol = gt.createPolygonByWKT(); System.out.println(pol); System.out.println(l_1.within(pol)); System.out.println(l_2.within(pol)); System.out.println(l_3.within(pol)); System.out.println(l_4.within(pol)); System.out.println(pol.within(l_3)); } }