public static <T> PointIndex<T> create() {
    return new PointIndex<>();
  }
Index to efficiently query points within a radius from a point.
<p>
Writes and reads are thread-safe, but all writes must occur before reads.

@param <T> the type of value associated with each point
planetiler-core/src/main/java/com/onthegomap/planetiler/geo/PointIndex.java