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<td style="vertical-align: top;; padding: 0; border-collapse: collapse; padding-right: 5px; font-size: 20px; line-height: 30px; mso-line-height-rule: exactly" class="page-title-pattern-header-container"> <span class="page-title-pattern-header" style="font-family: Arial, sans-serif; padding: 0; font-size: 20px; line-height: 30px; mso-text-raise: 2px; mso-line-height-rule: exactly; vertical-align: middle"> <a href="https://hibernate.atlassian.net/browse/HSEARCH-3275?atlOrigin=eyJpIjoiMjNkZWE0MGIyZDY5NGNkOTgyOWRiYWQ2MzhlNDNiNGMiLCJwIjoiaiJ9" style="color: #3b73af; text-decoration: none">Re: Search 6 groundwork - Move to a stable implementation of Lucene spatial support</a> </span> </td>
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<td class="text-paragraph-pattern-container mobile-resize-text " style="padding: 0; border-collapse: collapse; padding: 0 0 10px"> <p style="margin: 10px 0 0; margin-top: 0">The context has changed and made most of this ticket obsolete.</p> <p style="margin: 10px 0 0">First, <tt>LatLonPoint</tt> and related classes in Lucene are now in the core, not in the sandbox (<a href="https://issues.apache.org/jira/browse/LUCENE-7314" class="external-link" rel="nofollow noreferrer" style="color: #3b73af; text-decoration: none">https://issues.apache.org/jira/browse/LUCENE-7314</a>). They are thus supported to the same extent as other core features.</p> <p style="margin: 10px 0 0">Second, the precision of <tt>LatLonPoint</tt> seems largely sufficient for most use cases. From the javadoc of <tt>org.apache.lucene.document.LatLonPoint</tt>:</p>
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<p style="margin: 10px 0 0; margin-top: 0">Values are indexed with some loss of precision from the</p>
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<p style="margin: 10px 0 0; margin-top: 0">original double values (4.190951585769653E-8 for the latitude component</p>
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<p style="margin: 10px 0 0; margin-top: 0">and 8.381903171539307E-8 for longitude).</p>
</blockquote> <p style="margin: 10px 0 0">In the worst case, for latitude, this gives a precision near the equator of 40,075.017/360*8.381903171539307*10^-8 = 9.33 cm, or around 3.7 inches. I'd say this is enough to find the location of a pizza joint or a rental bike, or for most use cases we're likely to encounter.</p> <p style="margin: 10px 0 0">So, let's just add some documentation about the precision, that should be enough.</p> </td>
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