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坐标变换

发布于 2024-08-09 22:47:03 字数 222 浏览 2 评论 0原文

Java 是否存在任何开源或“免费”库，我可以在其中执行从一个空间系统到另一个空间系统的坐标转换？

我发现了 Opengeo http://opengeo.org/ 但它是一个庞大而全面的库，适用于各种空间事物。

还有更小的东西存在吗？我需要从 MGA56 转换为 WGS84。

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dawn曙光 2024-08-16 22:47:04

我需要在 WGS84（GPS 投影）和 EPSG 27700（英国国家电网）之间来回转换，我发现 geotrellis 库最准确、最可用。它是用 Scala 编写的，但显然您可以在 Java 中使用该库。这是我使用的 Maven 依赖项：

        <dependency>
            <groupId>org.locationtech.geotrellis</groupId>
            <artifactId>geotrellis-proj4_2.12</artifactId>
            <version>2.3.1</version>
        </dependency>

这是一些示例代码：

       CRS epsg27700 = CRS.fromEpsgCode(27700);
        CRS wgs84 = CRS.fromEpsgCode(4326);

        var toWgs84 = Transform.apply(epsg27700, wgs84);
        var fromWgs84 = Transform.apply(wgs84, epsg27700);

        Tuple2<Object, Object> southWestInWgs84 = toWgs84.apply(-90_619.29, 10_097.13);
        System.out.println("South-West corner in WGS 84: " + southWestInWgs84._1() + "," + southWestInWgs84._2());
        Tuple2<Object, Object> southWestBackToEpsg27700 = fromWgs84.apply(southWestInWgs84._1(), southWestInWgs84._2());
        System.out.println("South-West corner back to EPSG 27700: " + southWestBackToEpsg27700._1() + "," + southWestBackToEpsg27700._2());

它会产生以下输出：

WGS 84 中的西南角：-8.820000046234389,49.7899999643445
西南角返回 EPSG 27700：
-90619.2888566542,10097.128186725415

I've needed to convert back and forwards between WGS84 (the GPS projection) and EPSG 27700 (UK National Grid) and I've found the geotrellis library most accurate and usable. It's written in Scala but obviously you can use the library in Java. Here's the maven dependency I've used:

        <dependency>
            <groupId>org.locationtech.geotrellis</groupId>
            <artifactId>geotrellis-proj4_2.12</artifactId>
            <version>2.3.1</version>
        </dependency>

and this is some example code:

       CRS epsg27700 = CRS.fromEpsgCode(27700);
        CRS wgs84 = CRS.fromEpsgCode(4326);

        var toWgs84 = Transform.apply(epsg27700, wgs84);
        var fromWgs84 = Transform.apply(wgs84, epsg27700);

        Tuple2<Object, Object> southWestInWgs84 = toWgs84.apply(-90_619.29, 10_097.13);
        System.out.println("South-West corner in WGS 84: " + southWestInWgs84._1() + "," + southWestInWgs84._2());
        Tuple2<Object, Object> southWestBackToEpsg27700 = fromWgs84.apply(southWestInWgs84._1(), southWestInWgs84._2());
        System.out.println("South-West corner back to EPSG 27700: " + southWestBackToEpsg27700._1() + "," + southWestBackToEpsg27700._2());

which produces this output: