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From "David Smiley (JIRA)" <j...@apache.org>
Subject [jira] [Created] (LUCENE-4922) A SpatialPrefixTree based on the Hilbert Curve and variable grid sizes
Date Tue, 09 Apr 2013 18:10:16 GMT
David Smiley created LUCENE-4922:
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             Summary: A SpatialPrefixTree based on the Hilbert Curve and variable grid sizes
                 Key: LUCENE-4922
                 URL: https://issues.apache.org/jira/browse/LUCENE-4922
             Project: Lucene - Core
          Issue Type: New Feature
          Components: modules/spatial
            Reporter: David Smiley


My wish-list for an ideal SpatialPrefixTree has these properties:
* Hilbert Curve ordering
* Variable grid size per level (ex: 256 at the top, 64 at the bottom, 16 for all in-between)
* Compact binary encoding (so-called "Morton number")
* Works for geodetic (i.e. lat & lon) and non-geodetic

Some bonus wishes for use in geospatial:
* Use an equal-area projection such that each cell has an equal area to all others at the
same level.
* When advancing a grid level, if a cell's width is less than half its height. then divide
it as 4 vertically stacked instead of 2 by 2. The point is to avoid super-skinny cells which
occurs towards the poles and degrades performance.

All of this requires some basic performance benchmarks to measure the effects of these characteristics.

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