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	<title>Love2Trade&#039;s Blog &#187; Distance</title>
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		<title>Love2Trade&#039;s Blog &#187; Distance</title>
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		<title>Finding Distance between two points using longitude and latitude</title>
		<link>http://blog.love2trade.com/2007/11/02/finding-distance-between-two-points-using-longitude-and-latitude/</link>
		<comments>http://blog.love2trade.com/2007/11/02/finding-distance-between-two-points-using-longitude-and-latitude/#comments</comments>
		<pubDate>Sat, 03 Nov 2007 00:24:06 +0000</pubDate>
		<dc:creator>ash</dc:creator>
				<category><![CDATA[Technical]]></category>
		<category><![CDATA[ash]]></category>
		<category><![CDATA[Distance]]></category>

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		<description><![CDATA[This is a method that calulates a distance between two points. Let me know if you have a more acurate formula. public static bool ZipDistance(double Lat1, double Lon1, double Lat2, double Lon2, ref double result)     {         double LatRad1;         double LonRad1;         double LatRad2;         double LonRad2;         double [...]<img alt="" border="0" src="http://stats.wordpress.com/b.gif?host=blog.love2trade.com&amp;blog=1998526&amp;post=10&amp;subd=love2trade&amp;ref=&amp;feed=1" width="1" height="1" />]]></description>
			<content:encoded><![CDATA[<p style="margin:0;">This is a method that calulates a distance between two points. Let me know if you have a more acurate formula.<span id="more-10"></span></p>
<p style="margin:0;"><span style="color:blue;">public</span> <span style="color:blue;">static</span> <span style="color:blue;">bool</span> ZipDistance(<span style="color:blue;">double</span> Lat1, <span style="color:blue;">double</span> Lon1, <span style="color:blue;">double</span> Lat2, <span style="color:blue;">double</span> Lon2, <span style="color:blue;">ref</span> <span style="color:blue;">double</span> result)</p>
<p style="margin:0;">    {</p>
<p style="margin:0;">        <span style="color:blue;">double</span> LatRad1;</p>
<p style="margin:0;">        <span style="color:blue;">double</span> LonRad1;</p>
<p style="margin:0;">        <span style="color:blue;">double</span> LatRad2;</p>
<p style="margin:0;">        <span style="color:blue;">double</span> LonRad2;</p>
<p style="margin:0;">        <span style="color:blue;">double</span> LonRadDif;</p>
<p style="margin:0;">        <span style="color:blue;">double</span> RadDist;</p>
<p style="margin:0;">        <span style="color:blue;">double</span> X;</p>
<p style="margin:0;">        <span style="color:blue;">double</span> PI;</p>
<p style="margin:0;">        <span style="color:blue;">double</span> DistMI;</p>
<p style="margin:0;">        PI = 3.141592654;</p>
<p style="margin:0;">        <span style="color:blue;">if</span> (Lat1 == 0 | Lon1 == 0 | Lat2 == 0 | Lon2 == 0)</p>
<p style="margin:0;">        {</p>
<p style="margin:0;">            <span style="color:blue;">return</span> <span style="color:blue;">false</span>;</p>
<p style="margin:0;">        }</p>
<p style="margin:0;">        <span style="color:blue;">else</span> <span style="color:blue;">if</span> (Lat1 == Lat2 &amp; Lon1 == Lon2)</p>
<p style="margin:0;">        {</p>
<p style="margin:0;">            <span style="color:blue;">return</span> <span style="color:blue;">false</span>;</p>
<p style="margin:0;">        }</p>
<p style="margin:0;">        LatRad1 = Lat1 * PI / 180;</p>
<p style="margin:0;">        LonRad1 = Lon1 * PI / 180;</p>
<p style="margin:0;">        LatRad2 = Lat2 * PI / 180;</p>
<p style="margin:0;">        LonRad2 = Lon2 * PI / 180;</p>
<p style="margin:0;">        <span style="color:blue;">try</span></p>
<p style="margin:0;">        {</p>
<p style="margin:0;">            LonRadDif = <span style="color:#2b91af;">Math</span>.Abs(LonRad1 &#8211; LonRad2);</p>
<p style="margin:0;">            X = <span style="color:#2b91af;">Math</span>.Sin(LatRad1)*<span style="color:#2b91af;">Math</span>.Sin(LatRad2) + <span style="color:#2b91af;">Math</span>.Cos(LatRad1)*<span style="color:#2b91af;">Math</span>.Cos(LatRad2)*<span style="color:#2b91af;">Math</span>.Cos(LonRadDif);</p>
<p style="margin:0;">            RadDist = <span style="color:#2b91af;">Math</span>.Atan(-X/<span style="color:#2b91af;">Math</span>.Sqrt(-X*X + 1)) + 2*<span style="color:#2b91af;">Math</span>.Atan(1);</p>
<p style="margin:0;">            DistMI = RadDist*3958.754;</p>
<p style="margin:0;">            result = DistMI;</p>
<p style="margin:0;">        }<span style="color:blue;">catch</span>(<span style="color:#2b91af;">Exception</span>)</p>
<p style="margin:0;">        {</p>
<p style="margin:0;">            <span style="color:blue;">return</span> <span style="color:blue;">false</span>;</p>
<p style="margin:0;">        }</p>
<p style="margin:0;">        <span style="color:blue;">return</span> <span style="color:blue;">true</span>;</p>
<p style="margin:0;">    }</p>
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