Java+GeoTools实现WKT数据根据EPSG编码进行坐标系转换

场景

Java+GeoTools(开源的Java GIS工具包)快速入门-实现读取shp文件并显示：

Java+GeoTools(开源的Java GIS工具包)快速入门-实现读取shp文件并显示_霸道流氓气质的博客-CSDN博客

在上面实现Java中集成Geotools之后，需求是将WKT数据转换成其他坐标系的WKT。

比如说将EPSG:4524的坐标系转换成EPSG:2334的坐标系数据。

当然如果是数据量较少，可以直接从WKT中复制出来单个点的数据在EPSG的官网进行转换。

EPSG.io: Coordinate Systems Worldwide

但是如果数据量较大，需要通过代码遍历的方式去转换大量数据。

注：

博客：
霸道流氓气质的博客_CSDN博客-C#,架构之路,SpringBoot领域博主

实现

1、用到ESPG的转换需要添加依赖

        <dependency>
            <groupId>org.geotools</groupId>
            <artifactId>gt-epsg-hsql</artifactId>
            <version>24-SNAPSHOT</version>
        </dependency>

否则会提示:

No code "EPSG:4524" from authority "EPSG" found for object of type "EngineeringCRS"

上面也讲过需要设置geotools的仓库，所以完整的pom需要添加的内容

        <!-- GeoTools begin-->
        <dependency>
            <groupId>org.geotools</groupId>
            <artifactId>gt-shapefile</artifactId>
            <version>24-SNAPSHOT</version>
        </dependency>
        <dependency>
            <groupId>org.geotools</groupId>
            <artifactId>gt-swing</artifactId>
            <version>24-SNAPSHOT</version>
        </dependency>
        <!-- GeoTools epsg  need -->
        <dependency>
            <groupId>org.geotools</groupId>
            <artifactId>gt-epsg-hsql</artifactId>
            <version>24-SNAPSHOT</version>
        </dependency>
    </dependencies>
    <repositories>
        <repository>
            <id>osgeo</id>
            <name>OSGeo Release Repository</name>
            <url>https://repo.osgeo.org/repository/release/</url>
            <snapshots><enabled>false</enabled></snapshots>
            <releases><enabled>true</enabled></releases>
        </repository>
        <repository>
            <id>osgeo-snapshot</id>
            <name>OSGeo Snapshot Repository</name>
            <url>https://repo.osgeo.org/repository/snapshot/</url>
            <snapshots><enabled>true</enabled></snapshots>
            <releases><enabled>false</enabled></releases>
        </repository>
    </repositories>

    <!-- GeoTools end-->

2、然后新建类

import org.geotools.geometry.jts.JTS;
import org.geotools.referencing.CRS;
import org.locationtech.jts.geom.Geometry;
import org.locationtech.jts.io.ParseException;
import org.locationtech.jts.io.WKTReader;
import org.locationtech.jts.io.WKTWriter;
import org.opengis.referencing.FactoryException;
import org.opengis.referencing.crs.CRSAuthorityFactory;
import org.opengis.referencing.crs.CoordinateReferenceSystem;
import org.opengis.referencing.operation.MathTransform;
import org.opengis.referencing.operation.TransformException;

public class WKTTransform {
    public static void main(String[] args) throws ParseException, FactoryException, TransformException {

        //要转换的wkt
        String oldWKT = "LINESTRING (37360817.569479 5127237.510467304, 37360830.13825466 5127118.315033647)";
        WKTReader wktReader = new WKTReader();
        //读取wkt为Geometry 几何对象
        Geometry oldGeometry = wktReader.read(oldWKT);
        //获取CRS权威工厂
        CRSAuthorityFactory crsAuthorityFactory = CRS.getAuthorityFactory(true);
        //创建sourceCRS
        CoordinateReferenceSystem sourceCRS = crsAuthorityFactory.createCoordinateReferenceSystem("EPSG:4524");
        //创建targetCRS
        CoordinateReferenceSystem targetCRS = crsAuthorityFactory.createCoordinateReferenceSystem("EPSG:2334");
        //获取MathTransform
        MathTransform mathTransform = CRS.findMathTransform(sourceCRS, targetCRS, true);
        //转换
        Geometry transform = JTS.transform(oldGeometry, mathTransform);
        //Geometry几何对象转换为WKT
        String newWKT = new WKTWriter().write(transform);
        System.out.println(newWKT);

    }
}

详细说明见代码实现。