geotools判断一个点是否在多边形上

geotools判断一个点是否在多边形上

博客分类：  gis

 

判断一个点是否在多边形上,GIS里经常要用的功能,但在平面几何上也是可用的。

 

这里借助大名鼎鼎的geotools实现

 

jar包依赖,pom.xml

 

 "1.0" encoding="UTF-8"?>
 "http://maven.apache.org/POM/4.0.0"
          xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
          xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
     4.0.0

     com.wisely
     point
     1.0-SNAPSHOT

         UTF-8
         13.1




             org.geotools
             gt-geojson
             ${geotools.version}


             org.geotools
             gt-geometry
             ${geotools.version}


             org.geotools
             gt-epsg-hsql
             ${geotools.version}


             org.geotools
             gt-jts-wrapper
             ${geotools.version}





             maven2-repository.dev.java.net
             Java.net repository
             http://download.java.net/maven/2


             osgeo
             Open Source Geospatial Foundation Repository
             http://download.osgeo.org/webdav/geotools/

 

 代码

  String wktPoly = "POLYGON ((30 10, 40 40, 20 40, 10 20, 30 10))"; //请自行搜素了解wkt格式
  String wktPoint = "POINT (30 30)";
 WKTReader reader = new WKTReader(JTSFactoryFinder.getGeometryFactory());
         GeometryFactory geometryFactory = JTSFactoryFinder.getGeometryFactory(null);
 Geometry point = reader.read(wktPoint);
 Geometry poly = reader.read(wktPoly);
 poly.contains(point); //返回true或false