lucene-dev mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "David Smiley (JIRA)" <>
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:

             Summary: A SpatialPrefixTree based on the Hilbert Curve and variable grid sizes
                 Key: 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.

This message is automatically generated by JIRA.
If you think it was sent incorrectly, please contact your JIRA administrators
For more information on JIRA, see:

To unsubscribe, e-mail:
For additional commands, e-mail:

View raw message