Question

我有一个格式为EPSG：3857的坐标，需要将其转换为EPSG：4326。对于转换，我使用geotools。查阅每个示例，我都能找到，但是似乎出现了一个异常，该异常在任何地方都没有解释。

这是我想做的。

    private CoordinateReferenceSystem sourceCRS;
    private CoordinateReferenceSystem targetCRS;

private GeoCoordinate transform(GeoCoordinate geoCoordinate)
    throws FactoryException,
    TransformException {
    CRSAuthorityFactory factory = CRS.getAuthorityFactory(true);
    this.sourceCRS = factory.createCoordinateReferenceSystem("EPSG:3857");
    this.targetCRS = factory.createCoordinateReferenceSystem("EPSG:4326");

    // Or i try to use the CRS directly, that does not change anything

    // this.targetCRS = CRS.decode("EPSG:4326");
    // this.sourceCRS = CRS.decode("EPSG:3857");

    MathTransform transform = CRS.findMathTransform(this.sourceCRS, this.targetCRS, false);
    GeometryFactory geometryFactory = new GeometryFactory(new PrecisionModel(), 4326);
    Point point =
        geometryFactory.createPoint(new Coordinate(geoCoordinate.getLongitude(), geoCoordinate.getLatitude()));
    Point targetPoint = (Point) JTS.transform(point, transform);
    return new GeoCoordinate(targetPoint.getX(), targetPoint.getY());
}

执行此代码时，我总是会遇到以下异常：

org.opengis.referencing.NoSuchAuthorityCodeException: No code "EPSG:3857" from authority "EPSG" found for object of type "EngineeringCRS".

尝试创建sourceCRS时会引发异常。

如果有人能告诉我我在这里做错了，我将不胜感激。

Answer 1

由Oscar Fonts回答：http://osgeo-org.1560.x6.nabble.com/Facing-NoSuchAuthorityCodeException-problem-when-deployed-GeoTools-on-server-td4885362.html

To decode a CRS code, you need access to the EPSG database, which it 
seems it's not present. 

* Make sure you add gt-epsg-hsql in your project, and its 
depencencies, if any (you could use other EPSG factories as well, but 
that's the most usual). 
* To see what factories are available, you can iterate through 
ReferencingFactoryFinder.getCRSAuthoriyFactories. See if 
ThreadedEpsgHsqlFactory is there. 
* Better use CRS.decode("EPSG:4326"), which will loop through all 
available factories, and is a more compact code. 

Hope this helps.

为什么在创建CoordinateReferenceSystem时出现NoSuchAuthorityCodeException？

1 个答案: