如何使用过滤器Geotools通过endPoint或startPoint获取相交的行

Question

我有一个LineString featureSource。对于源中的一个特征，我想通过相同featureSource的startPoint或endPoint获取相交的行。

我尝试了这个只是endPoint：

Filter filter = ff.intersects(ff.literal(featureLastCoordinate), ff.function("endPoint", ff.literal(featureGeom)));
FeatureCollection<SimpleFeatureType, SimpleFeature> intersectedFeatColl = inputSource.getFeatures(filter);

而且：

Filter filter = ff.and(ff.intersects(ff.property(featureGeomPropName), ff.literal(featureLastCoordinate)), ff.function("endPoint", ff.literal(featureGeom)));

我无法找到过滤器的正确表达式。例如：

我想获得黄线的其他线条。

Answer 1

取决于您对线条接触的确定程度，您可以执行以下操作：

LineString lineString = (LineString) first.getDefaultGeometry();
Point[] points = { lineString.getStartPoint(), lineString.getEndPoint() };
for (Point p : points) {
  Filter f = CQL.toFilter("intersects( " + geom + ", " + p + ")");
  SimpleFeatureCollection res = featureSource.getFeatures(f);
  if (!res.isEmpty()) {
    System.out.println("Point " + p + " touches ");
    try (SimpleFeatureIterator itr = res.features()) {
      while (itr.hasNext()) {
        System.out.println(itr.next());
      }
    }
  }

  Polygon poly = (Polygon) p.buffer(10);
  f = CQL.toFilter("intersects( " + geom + ", " + poly + ")");
  res = featureSource.getFeatures(f);
  if (!res.isEmpty()) {
    System.out.println("Point " + p + " is close to ");
    try (SimpleFeatureIterator itr = res.features()) {
      while (itr.hasNext()) {
        System.out.println(itr.next());
      }
    }
  }
}