java - Geotools:wgs84 中缓冲区的边界框

Question

我需要一个 Java 函数来生成围绕缓冲区的边界框(矩形)。缓冲区由中心点(WGS84 坐标)和半径(以米为单位)定义。

在 JTS 中获取缓冲区的边界框似乎很简单:

Point center = ....
Geometry boundingBox = center.buffer(...).getEnvelope();

然而，这是纯平面几何。有没有办法使用以米为单位的距离坐标引用系统来做到这一点？

最适合 Geotools，但其他 Java 解决方案也可以...

Answer 1

尽管您采用了另一种方法，但我有另一种解决方案。结果将比您提出的解决方案更精确。

GeometryFactory GEOMETRY_FACTORY = JTSFactoryFinder.getGeometryFactory();

// Remember, order is (longitude, latitude)
Coordinate center = Coordinate(2.29443, 48.85816);
Point point = GEOMETRY_FACTORY.createPoint(center);

// Buffer 50KM around the point, then get the envelope
Envelope envelopeInternal = buffer(point, 50000).getEnvelopeInternal();

// Then you can play with the envelope, e.g.,
double minX = envelopeInternal.getMinX();
double maxX = envelopeInternal.getMaxX();

// The buffer using distanceInMeters
private Geometry buffer(Geometry geometry, double distanceInMeters) throws FactoryException, TransformException {
     String code = "AUTO:42001," + geometry.getCentroid().getCoordinate().x + "," + geometry.getCentroid().getCoordinate().y;
     CoordinateReferenceSystem auto = CRS.decode(code);

     MathTransform toTransform = CRS.findMathTransform(DefaultGeographicCRS.WGS84, auto);
     MathTransform fromTransform = CRS.findMathTransform(auto, DefaultGeographicCRS.WGS84);

     Geometry pGeom = JTS.transform(geometry, toTransform);
     Geometry pBufferedGeom = pGeom.buffer(distanceInMeters);
     return JTS.transform(pBufferedGeom, fromTransform);
}

这是带有结果的 map ，红色缓冲区，黑色信封。