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Date: Thu, 21 Aug 2014 02:31:31 +0000 (UTC)
From: "Varun  V Shenoy (JIRA)" <jira@apache.org>
To: dev@lucene.apache.org
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Subject: [jira] [Updated] (LUCENE-4922) A SpatialPrefixTree based on the
 Hilbert Curve and variable grid sizes
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     [ https://issues.apache.org/jira/browse/LUCENE-4922?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Varun  V Shenoy updated LUCENE-4922:
------------------------------------

    Attachment: LUCENE-4922.patch

> 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
>            Assignee: David Smiley
>              Labels: gsoc2014
>         Attachments: HilbertConverter.zip, LUCENE-4922.patch
>
>
> 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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