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Posted to dev@lucene.apache.org by "Chris Male (JIRA)" <ji...@apache.org> on 2009/12/11 15:14:18 UTC
[jira] Created: (LUCENE-2151) Abstract the distance calculation
process in the Spatial contrib
Abstract the distance calculation process in the Spatial contrib
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Key: LUCENE-2151
URL: https://issues.apache.org/jira/browse/LUCENE-2151
Project: Lucene - Java
Issue Type: Improvement
Components: contrib/spatial
Affects Versions: 3.1
Reporter: Chris Male
The spatial contrib shouldn't tie users to one particular way of calculating distances. Wikipedia lists multiple different formulas for the great-circle distance calculation, and there are alternatives to that as well. In a situation where many documents have the same points, it would be useful to be able to cache some calculated values as well (currently this is sort of handled in the filtering process itself).
This issue addresses this by abstracting away the distance calculator, allowing the user to provide the implementation of choice. It would then be possible to swap in different distance calculation strategies without altering the distance filtering process itself.
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[jira] Updated: (LUCENE-2151) Abstract the distance calculation
process in the Spatial contrib
Posted by "Chris Male (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/LUCENE-2151?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Chris Male updated LUCENE-2151:
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Attachment: LUCENE-2151.patch
Attached patch that adds in the GeoDistanceCalculator interface, with 2 impls:
- ArcGeoDistanceCalculator (note it was known as ArcDistanceCalculator in previous patches, this addresses this inconsistency) - This calculator emulates the existing distance calculation algorithm.
- PlaneGeoDistanceCalculator - This calculator assumes the the earth is flat, and does simple trigonometry. This obviously includes an error, but it maybe an error that is acceptable to some.
Tests for both impls are included
> Abstract the distance calculation process in the Spatial contrib
> ----------------------------------------------------------------
>
> Key: LUCENE-2151
> URL: https://issues.apache.org/jira/browse/LUCENE-2151
> Project: Lucene - Java
> Issue Type: Improvement
> Components: contrib/spatial
> Affects Versions: 3.1
> Reporter: Chris Male
> Attachments: LUCENE-2151.patch
>
>
> The spatial contrib shouldn't tie users to one particular way of calculating distances. Wikipedia lists multiple different formulas for the great-circle distance calculation, and there are alternatives to that as well. In a situation where many documents have the same points, it would be useful to be able to cache some calculated values as well (currently this is sort of handled in the filtering process itself).
> This issue addresses this by abstracting away the distance calculator, allowing the user to provide the implementation of choice. It would then be possible to swap in different distance calculation strategies without altering the distance filtering process itself.
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[jira] Assigned: (LUCENE-2151) Abstract the distance calculation
process in the Spatial contrib
Posted by "Simon Willnauer (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/LUCENE-2151?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Simon Willnauer reassigned LUCENE-2151:
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Assignee: Simon Willnauer
> Abstract the distance calculation process in the Spatial contrib
> ----------------------------------------------------------------
>
> Key: LUCENE-2151
> URL: https://issues.apache.org/jira/browse/LUCENE-2151
> Project: Lucene - Java
> Issue Type: Improvement
> Components: contrib/spatial
> Affects Versions: 3.1
> Reporter: Chris Male
> Assignee: Simon Willnauer
> Attachments: LUCENE-2151.patch
>
>
> The spatial contrib shouldn't tie users to one particular way of calculating distances. Wikipedia lists multiple different formulas for the great-circle distance calculation, and there are alternatives to that as well. In a situation where many documents have the same points, it would be useful to be able to cache some calculated values as well (currently this is sort of handled in the filtering process itself).
> This issue addresses this by abstracting away the distance calculator, allowing the user to provide the implementation of choice. It would then be possible to swap in different distance calculation strategies without altering the distance filtering process itself.
--
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You can reply to this email to add a comment to the issue online.
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[jira] Updated: (LUCENE-2151) Abstract the distance calculation
process in the Spatial contrib
Posted by "Chris Male (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/LUCENE-2151?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Chris Male updated LUCENE-2151:
-------------------------------
Attachment: LUCENE-2151.patch
Updated patch so that it uses the DistanceUnits.convert instance method.
> Abstract the distance calculation process in the Spatial contrib
> ----------------------------------------------------------------
>
> Key: LUCENE-2151
> URL: https://issues.apache.org/jira/browse/LUCENE-2151
> Project: Lucene - Java
> Issue Type: Improvement
> Components: contrib/spatial
> Affects Versions: 3.1
> Reporter: Chris Male
> Assignee: Simon Willnauer
> Attachments: LUCENE-2151.patch, LUCENE-2151.patch
>
>
> The spatial contrib shouldn't tie users to one particular way of calculating distances. Wikipedia lists multiple different formulas for the great-circle distance calculation, and there are alternatives to that as well. In a situation where many documents have the same points, it would be useful to be able to cache some calculated values as well (currently this is sort of handled in the filtering process itself).
> This issue addresses this by abstracting away the distance calculator, allowing the user to provide the implementation of choice. It would then be possible to swap in different distance calculation strategies without altering the distance filtering process itself.
--
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