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  1. Lucene - Core
  2. LUCENE-6477

Add BKD tree for spatial shape query intersecting indexed points


    • New Feature
    • Status: Closed
    • Major
    • Resolution: Fixed
    • None
    • 5.3, 6.0
    • None
    • None
    • New


      I'd like to explore using dedicated spatial trees for faster shape
      intersection filters than postings-based implementations.

      I implemented the tree data structure from

      The idea is simple: it builds a full binary tree, partitioning 2D
      space, alternately on lat and then lon, into smaller and smaller
      rectangles until a leaf has <= N (default 1024) points.

      It cannot index shapes (just points), and can then do fast shape
      intersection queries. Multi-valued fields are supported.

      I only implemented the "point is contained in this bounding box" query
      for now, but I think polygon shape querying should be easy to
      implement using the same approach from LUCENE-6450.

      For indexing, you add BKDPointField (takes lat, lon) to your doc, and
      must set up your Codec use BKDTreeDocValuesFormat for that field.
      This DV format wraps Lucene50DVFormat, but then builds the disk-based
      BKD tree structure on the side. BKDPointInBBoxQuery then requires this
      DVFormat, and casts it to gain access to the tree.

      I quantize each incoming double lat/lon to 32 bits precision (so 64
      bits per point) = ~9 milli-meter lon precision at the equator, I


        1. LUCENE-6477.patch
          130 kB
          Michael McCandless
        2. LUCENE-6477.patch
          157 kB
          Michael McCandless
        3. LUCENE-6477.patch
          157 kB
          Michael McCandless
        4. LUCENE-6477.patch
          159 kB
          Michael McCandless
        5. LUCENE-6477.patch
          120 kB
          Michael McCandless
        6. LUCENE-6477.patch
          116 kB
          Michael McCandless



            mikemccand Michael McCandless
            mikemccand Michael McCandless
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