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    <title>MongoDB Jira</title>
    <link>https://jira.mongodb.org</link>
    <description>This file is an XML representation of an issue</description>
    <language>en-us</language>    <build-info>
        <version>9.7.1</version>
        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[DOCS-8123] $geoNear distanceMultiplier</title>
                <link>https://jira.mongodb.org/browse/DOCS-8123</link>
                <project id="10380" key="DOCS">Documentation</project>
                    <description>&lt;p&gt;There are discrepancies on the units used for various fields for &lt;a href=&quot;https://docs.mongodb.com/manual/reference/operator/aggregation/geoNear/&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;$geoNear&lt;/a&gt;.&lt;/p&gt;

&lt;p&gt;The description for the &lt;b&gt;distanceMultiplier&lt;/b&gt; field for $geoNear says&lt;/p&gt;

&lt;blockquote&gt;
&lt;p&gt;The factor to multiply all distances returned by the query. For example, use the distanceMultiplier to convert radians, &lt;b&gt;as returned by a spherical query&lt;/b&gt;, to kilometers by multiplying by the radius of the Earth.&lt;/p&gt;&lt;/blockquote&gt;

&lt;p&gt;Also, the description for &lt;b&gt;minDistance&lt;/b&gt; says, &lt;/p&gt;

&lt;blockquote&gt;
&lt;p&gt;Specify the distance in meters for GeoJSON data and in radians for legacy coordinate pairs&lt;/p&gt;&lt;/blockquote&gt;

&lt;p&gt;however a &lt;a href=&quot;https://docs.mongodb.com/manual/core/2dsphere/#overview&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;2dsphere&lt;/a&gt; index will convert legacy coordinate pairs to GeoJSON Point.  So I can have a field like this:&lt;/p&gt;

&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;&quot;p&quot;: [ -100.8, 33.1875 ]&lt;/span&gt;&lt;/pre&gt;
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&lt;p/&gt;

&lt;p&gt;whose 2dsphere index will convert it into&lt;/p&gt;
&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
		&lt;tbody &gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;{ type: &quot;Point&quot;, coordinates: [ -100.8, 33.1875 ] }&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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			&lt;/tbody&gt;
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&lt;p/&gt;

&lt;p&gt;such that I can specify &lt;b&gt;minDistance&lt;/b&gt; in meters even though the documentation says it should be in radians.&lt;/p&gt;

&lt;p&gt;The &lt;b&gt;near&lt;/b&gt; field sheds some light:&lt;/p&gt;

&lt;blockquote&gt;
&lt;p&gt;If using a &lt;b&gt;2dsphere&lt;/b&gt; index, you can specify the point as either a GeoJSON point or legacy coordinate pair.  If using a &lt;b&gt;2d&lt;/b&gt; index, specify the point as a legacy coordinate pair.&lt;/p&gt;&lt;/blockquote&gt;

&lt;p&gt;So the main factor appears to be the index used (2dsphere vs 2d) instead of whether the point is GeoJSON or legacy coordinate pair.&lt;/p&gt;

&lt;p&gt;Comment on: &quot;reference/operator/aggregation/geoNear.txt&quot;&lt;/p&gt;</description>
                <environment></environment>
        <key id="294799">DOCS-8123</key>
            <summary>$geoNear distanceMultiplier</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</type>
                                            <priority id="4" iconUrl="https://jira.mongodb.org/images/icons/priorities/minor.svg">Minor - P4</priority>
                        <status id="6" iconUrl="https://jira.mongodb.org/images/icons/statuses/closed.png" description="The issue is considered finished, the resolution is correct. Issues which are closed can be reopened.">Closed</status>
                    <statusCategory id="3" key="done" colorName="success"/>
                                    <resolution id="12300">Won&apos;t Do</resolution>
                                        <assignee username="kay.kim@mongodb.com">Kay Kim</assignee>
                                    <reporter username="jake.angerman">Jake Angerman</reporter>
                        <labels>
                    </labels>
                <created>Fri, 17 Jun 2016 18:07:15 +0000</created>
                <updated>Mon, 30 Oct 2023 22:26:36 +0000</updated>
                                                            <fixVersion>Server_Docs_20231030</fixVersion>
                                    <component>manual</component>
                    <component>Server</component>
                        <due></due>
                            <votes>0</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="4941014" author="edu.bot" created="Mon, 31 Oct 2022 16:13:52 +0000"  >&lt;p&gt;Hello! This ticket has been closed due to inactivity. If you believe this ticket is still important, please reopen it and leave a comment to explain why. Thank you!&lt;/p&gt;</comment>
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