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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>
    </build-info>


<item>
            <title>[SERVER-7811] geo distance calculation</title>
                <link>https://jira.mongodb.org/browse/SERVER-7811</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;we can&apos;t seem to figure out the calculation mongodb uses when it returns the distance (&quot;dis&quot;) key for a geoNear command&lt;/p&gt;

&lt;p&gt;we need this distance, but we want to use the $nearSphere find query instead of the geoNear command&lt;br/&gt;
since the find query doesn&apos;t return the calculated distance, we have to calculate it on our own&lt;br/&gt;
the problem is that any formula we use to calculate the distance doesn&apos;t match the distances calculated by mongodb&lt;br/&gt;
the manually calculated distance is very close to the one returned by geoNear, but never exactly the same (they&apos;re not even all linearly offset, so it would mean a different order of documents)&lt;/p&gt;

&lt;p&gt;these are the formulas we tried so far, which all return the same results (among themselves), but none match mongodb&apos;s geoNear distance numbers:&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;   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;private static $cf_earth_km = 40074;&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;$theta = $lng1 - $lng2;&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;$dist = sin(deg2rad($lat1)) * sin(deg2rad($lat2)) + cos(deg2rad($lat1)) * cos(deg2rad($lat2)) * cos(deg2rad($theta));&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;$dist = acos($dist);&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;$dist = rad2deg($dist);&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;$km = self::degree2km($dist);&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&amp;nbsp;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;public static function degree2km($degree, $precision = false) {&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&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;   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;	$km = $degree * self::$cf_earth_km / 360;&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&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;   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;	return $precision ? floatval(sprintf(&apos;%.&apos; . intval($precision) . &apos;f&apos;, $km)) : $km;&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&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-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;}&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&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;   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;private static $radius_earth_km = 6378;&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&amp;nbsp;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;$pi80 = M_PI / 180;&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&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;   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;$lat1 *= $pi80;&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;$lng1 *= $pi80;&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;$lat2 *= $pi80;&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;$lng2 *= $pi80;&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&amp;nbsp;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;$dlat = $lat2 - $lat1;&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;$dlng = $lng2 - $lng1;&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;$a = sin($dlat / 2) * sin($dlat / 2) + cos($lat1) * cos($lat2) * sin($dlng / 2) * sin($dlng / 2);&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&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;   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;$c = 2 * atan2(sqrt($a), sqrt(1 - $a));&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;$km = self::$radius_earth_km * $c;&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;

&lt;p&gt;so the question is, how does mongodb calculate the distance returned by geoNear?&lt;/p&gt;

&lt;p&gt;looking at mongodb source code, i think i successfully traced the actual calculation to a S2LatLng::GetDistance function (&lt;a href=&quot;http://code.google.com/p/s2-geometry-library/source/browse/geometry/s2latlng.cc?r=c872048da5d12db6058022e73f9c5dcbfdd93079&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;http://code.google.com/p/s2-geometry-library/source/browse/geometry/s2latlng.cc?r=c872048da5d12db6058022e73f9c5dcbfdd93079&lt;/a&gt;), but it&apos;s basically the same as the first custom calculation function we tried&lt;/p&gt;

&lt;p&gt;distance calculation test:&lt;br/&gt;
&lt;tt&gt;monospaced&lt;/tt&gt;&lt;br/&gt;
mongo geoNear: 1.10000 km | mongo source (S2LatLng::GetDistance): 0.95942 km | custom 1: 0.96000 km | custom 2: 0.96000 km&lt;br/&gt;
mongo geoNear: 1.32000 km | mongo source (S2LatLng::GetDistance): 1.52556 km | custom 1: 1.53000 km | custom 2: 1.53000 km&lt;br/&gt;
mongo geoNear: 1.46000 km | mongo source (S2LatLng::GetDistance): 1.62114 km | custom 1: 1.62000 km | custom 2: 1.62000 km&lt;br/&gt;
mongo geoNear: 1.55000 km | mongo source (S2LatLng::GetDistance): 1.72047 km | custom 1: 1.72000 km | custom 2: 1.72000 km&lt;br/&gt;
mongo geoNear: 1.56000 km | mongo source (S2LatLng::GetDistance): 1.47956 km | custom 1: 1.48000 km | custom 2: 1.48000 km&lt;br/&gt;
mongo geoNear: 1.56000 km | mongo source (S2LatLng::GetDistance): 1.45865 km | custom 1: 1.46000 km | custom 2: 1.46000 km&lt;br/&gt;
mongo geoNear: 1.57000 km | mongo source (S2LatLng::GetDistance): 1.33709 km | custom 1: 1.34000 km | custom 2: 1.34000 km&lt;br/&gt;
mongo geoNear: 1.66000 km | mongo source (S2LatLng::GetDistance): 1.46648 km | custom 1: 1.47000 km | custom 2: 1.47000 km&lt;br/&gt;
mongo geoNear: 1.67000 km | mongo source (S2LatLng::GetDistance): 1.82464 km | custom 1: 1.82000 km | custom 2: 1.82000 km&lt;br/&gt;
mongo geoNear: 1.68000 km | mongo source (S2LatLng::GetDistance): 1.91546 km | custom 1: 1.92000 km | custom 2: 1.92000 km&lt;br/&gt;
mongo geoNear: 1.83000 km | mongo source (S2LatLng::GetDistance): 1.63233 km | custom 1: 1.63000 km | custom 2: 1.63000 km&lt;br/&gt;
mongo geoNear: 1.83000 km | mongo source (S2LatLng::GetDistance): 1.62369 km | custom 1: 1.62000 km | custom 2: 1.62000 km&lt;br/&gt;
mongo geoNear: 1.83000 km | mongo source (S2LatLng::GetDistance): 1.61788 km | custom 1: 1.62000 km | custom 2: 1.62000 km&lt;br/&gt;
mongo geoNear: 1.83000 km | mongo source (S2LatLng::GetDistance): 1.63008 km | custom 1: 1.63000 km | custom 2: 1.63000 km&lt;br/&gt;
mongo geoNear: 1.88000 km | mongo source (S2LatLng::GetDistance): 2.02586 km | custom 1: 2.03000 km | custom 2: 2.03000 km&lt;br/&gt;
mongo geoNear: 1.89000 km | mongo source (S2LatLng::GetDistance): 1.64674 km | custom 1: 1.65000 km | custom 2: 1.65000 km&lt;br/&gt;
mongo geoNear: 1.89000 km | mongo source (S2LatLng::GetDistance): 1.61495 km | custom 1: 1.61000 km | custom 2: 1.61000 km&lt;br/&gt;
mongo geoNear: 1.90000 km | mongo source (S2LatLng::GetDistance): 1.67249 km | custom 1: 1.67000 km | custom 2: 1.67000 km&lt;br/&gt;
mongo geoNear: 1.90000 km | mongo source (S2LatLng::GetDistance): 2.02528 km | custom 1: 2.03000 km | custom 2: 2.03000 km&lt;br/&gt;
mongo geoNear: 1.90000 km | mongo source (S2LatLng::GetDistance): 1.65547 km | custom 1: 1.66000 km | custom 2: 1.66000 km&lt;br/&gt;
mongo geoNear: 1.90000 km | mongo source (S2LatLng::GetDistance): 2.01676 km | custom 1: 2.02000 km | custom 2: 2.02000 km&lt;br/&gt;
mongo geoNear: 1.90000 km | mongo source (S2LatLng::GetDistance): 1.63483 km | custom 1: 1.63000 km | custom 2: 1.63000 km&lt;br/&gt;
mongo geoNear: 1.91000 km | mongo source (S2LatLng::GetDistance): 1.70989 km | custom 1: 1.71000 km | custom 2: 1.71000 km&lt;br/&gt;
mongo geoNear: 1.95000 km | mongo source (S2LatLng::GetDistance): 1.86317 km | custom 1: 1.86000 km | custom 2: 1.86000 km&lt;br/&gt;
&lt;tt&gt;monospaced&lt;/tt&gt;&lt;/p&gt;</description>
                <environment></environment>
        <key id="57996">SERVER-7811</key>
            <summary>geo distance calculation</summary>
                <type id="6" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14720&amp;avatarType=issuetype">Question</type>
                                            <priority id="3" iconUrl="https://jira.mongodb.org/images/icons/priorities/major.svg">Major - P3</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="9">Done</resolution>
                                        <assignee username="hari.khalsa@10gen.com">hari.khalsa@10gen.com</assignee>
                                    <reporter username="pcmaniac">Nemanja Dubravac</reporter>
                        <labels>
                            <label>geoNear</label>
                    </labels>
                <created>Fri, 30 Nov 2012 10:49:03 +0000</created>
                <updated>Mon, 11 Jul 2016 17:59:25 +0000</updated>
                            <resolved>Mon, 7 Jan 2013 15:18:01 +0000</resolved>
                                                                    <component>Geo</component>
                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="209197" author="hari.khalsa@10gen.com" created="Fri, 7 Dec 2012 19:25:53 +0000"  >&lt;p&gt;Hello!&lt;/p&gt;

&lt;p&gt;The S2 stuff you are looking at is for the under-development 2dsphere index type.&lt;/p&gt;

&lt;p&gt;If you&apos;re using $nearSphere (which only works with an index type of &apos;2d&apos;), the code that calculates the distance is here:&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/blob/master/src/mongo/db/geo/shapes.cpp#L416&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/blob/master/src/mongo/db/geo/shapes.cpp#L416&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;It doesn&apos;t actually calculate a distance in meters, since it works in radians.  Can you explain how you&apos;re getting kilometers, and maybe provide the queries you&apos;re sending mongo to get this behavior?&lt;/p&gt;</comment>
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