我有EPSG格式的坐标:3857,需要将其转换为EPSG:4326。对于转换,我使用geotools。当查找我能找到的每个例子但我似乎得到一个未在任何地方解释的异常。
这是我尝试做的。
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,我总是得到以下异常:
org.opengis.referencing.NoSuchAuthorityCodeException: No code "EPSG:3857" from authority "EPSG" found for object of type "EngineeringCRS".
尝试创建sourceCRS时会抛出异常。
如果有人能告诉我这里做错了什么,我会非常感激。
来自Oscar Fonts的回答: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.