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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