两点间的距离python 两点间的距离怎么算

百度地图如何计算两点之间距离

路线规划提供了获取路线距离的方法，见MKRoutePlan 类的 getDistance 方法。

如果是计算任意两点的距离，自2.0.0版本开始，Android SDK为开发者提供了计算距离的接口（DistanceUtil），具体使用方法如下：

1.GeoPoint p1LL = new GeoPoint(39971802, 116347927);

2.GeoPoint p2LL = new GeoPoint(39892131, 116498555);

3.double distance = DistanceUtil.getDistance(p1LL, p2LL);

如果开发者使用的是1.3.5及以前的版本，在计算任意两点之前的距离时，有如下两种方法：一种利用勾股定理计算，适用于两点距离很近的情况；一种按标准的球面大圆劣弧长度计算，适用于距离较远的情况。

<ol style="margin: 0px; padding: 0px;"><li class="li1" style="list-style: none; margin: 0px; padding: 0px; line-height: 21px; vertical-align: top;"><div class="de1"><span class="nu0" style="color: rgb(204, 102, 204);">1</span>.	<span class="kw1" style="color: rgb(0, 0, 0); font-weight: bold;">static</span> <span class="kw4" style="color: rgb(0, 0, 102); font-weight: bold;">double</span> DEF_PI <span class="sy0" style="color: rgb(51, 153, 51);">=</span> <span class="nu0" style="color: rgb(204, 102, 204);">3.14159265359</span><span class="sy0" style="color: rgb(51, 153, 51);">;</span> <span class="co1" style="color: rgb(102, 102, 102); font-style: italic;">// PI</span></div></li><li class="li1" style="list-style: none; margin: 0px; padding: 0px; line-height: 21px; vertical-align: top;"><div class="de1"><span class="nu0" style="color: rgb(204, 102, 204);">2</span>.	<span class="kw1" style="color: rgb(0, 0, 0); font-weight: bold;">static</span> <span class="kw4" style="color: rgb(0, 0, 102); font-weight: bold;">double</span> DEF_2PI<span class="sy0" style="color: rgb(51, 153, 51);">=</span> <span class="nu0" style="color: rgb(204, 102, 204);">6.28318530712</span><span class="sy0" style="color: rgb(51, 153, 51);">;</span> <span class="co1" style="color: rgb(102, 102, 102); font-style: italic;">// 2*PI</span></div></li><li class="li1" style="list-style: none; margin: 0px; padding: 0px; line-height: 21px; vertical-align: top;"><div class="de1"><span class="nu0" style="color: rgb(204, 102, 204);">3</span>.	<span class="kw1" style="color: rgb(0, 0, 0); font-weight: bold;">static</span> <span class="kw4" style="color: rgb(0, 0, 102); font-weight: bold;">double</span> DEF_PI180<span class="sy0" style="color: rgb(51, 153, 51);">=</span> <span class="nu0" style="color: rgb(204, 102, 204);">0.01745329252</span><span class="sy0" style="color: rgb(51, 153, 51);">;</span> <span class="co1" style="color: rgb(102, 102, 102); font-style: italic;">// PI/180.0</span></div></li><li class="li1" style="list-style: none; margin: 0px; padding: 0px; line-height: 21px; vertical-align: top;"><div class="de1"><span class="nu0" style="color: rgb(204, 102, 204);">4</span>.	<span class="kw1" style="color: rgb(0, 0, 0); font-weight: bold;">static</span> <span class="kw4" style="color: rgb(0, 0, 102); font-weight: bold;">double</span> DEF_R <span class="sy0" style="color: rgb(51, 153, 51);">=</span><span class="nu0" style="color: rgb(204, 102, 204);">6370693.5</span><span class="sy0" style="color: rgb(51, 153, 51);">;</span> <span class="co1" style="color: rgb(102, 102, 102); font-style: italic;">// radius of earth</span></div></li><li class="li1" style="list-style: none; margin: 0px; padding: 0px; line-height: 21px; vertical-align: top;"><div class="de1"><span class="nu0" style="color: rgb(204, 102, 204);">5</span>.	<span class="kw1" style="color: rgb(0, 0, 0); font-weight: bold;">public</span> <span class="kw4" style="color: rgb(0, 0, 102); font-weight: bold;">double</span> GetShortDistance<span class="br0" style="color: rgb(0, 153, 0);">(</span><span class="kw4" style="color: rgb(0, 0, 102); font-weight: bold;">double</span> lon1, <span class="kw4" style="color: rgb(0, 0, 102); font-weight: bold;">double</span> lat1, <span class="kw4" style="color: rgb(0, 0, 102); font-weight: bold;">double</span> lon2, <span class="kw4" style="color: rgb(0, 0, 102); font-weight: bold;">double</span> lat2<span class="br0" style="color: rgb(0, 153, 0);">)</span></div></li><li class="li1" style="list-style: none; margin: 0px; padding: 0px; line-height: 21px; vertical-align: top;"><div class="de1"><span class="nu0" style="color: rgb(204, 102, 204);">6</span>.	<span class="br0" style="color: rgb(0, 153, 0);">{</span></div></li><li class="li1" style="list-style: none; margin: 0px; padding: 0px; line-height: 21px; vertical-align: top;"><div class="de1"><span class="nu0" style="color: rgb(204, 102, 204);">7</span>.		<span class="kw4" style="color: rgb(0, 0, 102); font-weight: bold;">double</span> ew1, ns1, ew2, ns2<span class="sy0" style="color: rgb(51, 153, 51);">;</span></div></li><li class="li1" style="list-style: none; margin: 0px; padding: 0px; line-height: 21px; vertical-align: top;"><div class="de1"><span class="nu0" style="color: rgb(204, 102, 204);">8</span>.		<span class="kw4" style="color: rgb(0, 0, 102); font-weight: bold;">double</span> dx, dy, dew<span class="sy0" style="color: rgb(51, 153, 51);">;</span></div></li><li class="li1" style="list-style: none; margin: 0px; padding: 0px; line-height: 21px; vertical-align: top;"><div class="de1"><span class="nu0" style="color: rgb(204, 102, 204);">9</span>.		<span class="kw4" style="color: rgb(0, 0, 102); font-weight: bold;">double</span> distance<span class="sy0" style="color: rgb(51, 153, 51);">;</span></div></li><li class="li1" style="list-style: none; margin: 0px; padding: 0px; line-height: 21px; vertical-align: top;"><div class="de1"><span class="nu0" style="color: rgb(204, 102, 204);">10</span>.		<span class="co1" style="color: rgb(102, 102, 102); font-style: italic;">// 角度转换为弧度</span></div></li><li class="li1" style="list-style: none; margin: 0px; padding: 0px; line-height: 21px; vertical-align: top;"><div class="de1"><span class="nu0" style="color: rgb(204, 102, 204);">11</span>.		<span class="me1" style="color: rgb(0, 102, 51);">ew1</span> <span class="sy0" style="color: rgb(51, 153, 51);">=</span> lon1 <span class="sy0" style="color: rgb(51, 153, 51);">*</span> DEF_PI180<span class="sy0" style="color: rgb(51, 153, 51);">;</span></div></li><li class="li1" style="list-style: none; margin: 0px; padding: 0px; line-height: 21px; vertical-align: top;"><div class="de1"><span class="nu0" style="color: rgb(204, 102, 204);">12</span>.		<span class="me1" style="color: rgb(0, 102, 51);">ns1</span> <span class="sy0" style="color: rgb(51, 153, 51);">=</span> lat1 <span class="sy0" style="color: rgb(51, 153, 51);">*</span> DEF_PI180<span class="sy0" style="color: rgb(51, 153, 51);">;</span></div></li><li class="li1" style="list-style: none; margin: 0px; padding: 0px; line-height: 21px; vertical-align: top;"><div class="de1"><span class="nu0" style="color: rgb(204, 102, 204);">13</span>.		<span class="me1" style="color: rgb(0, 102, 51);">ew2</span> <span class="sy0" style="color: rgb(51, 153, 51);">=</span> lon2 <span class="sy0" style="color: rgb(51, 153, 51);">*</span> DEF_PI180<span class="sy0" style="color: rgb(51, 153, 51);">;</span></div></li><li class="li1" style="list-style: none; margin: 0px; padding: 0px; line-height: 21px; vertical-align: top;"><div class="de1"><span class="nu0" style="color: rgb(204, 102, 204);">14</span>.		<span class="me1" style="color: rgb(0, 102, 51);">ns2</span> <span class="sy0" style="color: rgb(51, 153, 51);">=</span> lat2 <span class="sy0" style="color: rgb(51, 153, 51);">*</span> DEF_PI180<span class="sy0" style="color: rgb(51, 153, 51);">;</span></div></li><li class="li1" style="list-style: none; margin: 0px; padding: 0px; line-height: 21px; vertical-align: top;"><div class="de1"><span class="nu0" style="color: rgb(204, 102, 204);">15</span>.		<span class="co1" style="color: rgb(102, 102, 102); font-style: italic;">// 经度差</span></div></li><li class="li1" style="list-style: none; margin: 0px; padding: 0px; line-height: 21px; vertical-align: top;"><div class="de1"><span class="nu0" style="color: rgb(204, 102, 204);">16</span>.		<span class="me1" style="color: rgb(0, 102, 51);">dew</span> <span class="sy0" style="color: rgb(51, 153, 51);">=</span> ew1 <span class="sy0" style="color: rgb(51, 153, 51);">-</span> ew2<span class="sy0" style="color: rgb(51, 153, 51);">;</span></div></li><li class="li1" style="list-style: none; margin: 0px; padding: 0px; line-height: 21px; vertical-align: top;"><div class="de1"><span class="nu0" style="color: rgb(204, 102, 204);">17</span>.		<span class="co1" style="color: rgb(102, 102, 102); font-style: italic;">// 若跨东经和西经180 度，进行调整</span></div></li><li class="li1" style="list-style: none; margin: 0px; padding: 0px; line-height: 21px; vertical-align: top;"><div class="de1"><span class="nu0" style="color: rgb(204, 102, 204);">18</span>.		<span class="kw1" style="color: rgb(0, 0, 0); font-weight: bold;">if</span> <span class="br0" style="color: rgb(0, 153, 0);">(</span>dew <span class="sy0" style="color: rgb(51, 153, 51);">></span> DEF_PI<span class="br0" style="color: rgb(0, 153, 0);">)</span></div></li><li class="li1" style="list-style: none; margin: 0px; padding: 0px; line-height: 21px; vertical-align: top;"><div class="de1"><span class="nu0" style="color: rgb(204, 102, 204);">19</span>.		<span class="me1" style="color: rgb(0, 102, 51);">dew</span> <span class="sy0" style="color: rgb(51, 153, 51);">=</span> DEF_2PI <span class="sy0" style="color: rgb(51, 153, 51);">-</span> dew<span class="sy0" style="color: rgb(51, 153, 51);">;</span></div></li><li class="li1" style="list-style: none; margin: 0px; padding: 0px; line-height: 21px; vertical-align: top;"><div class="de1"><span class="nu0" style="color: rgb(204, 102, 204);">20</span>.		<span class="kw1" style="color: rgb(0, 0, 0); font-weight: bold;">else</span> <span class="kw1" style="color: rgb(0, 0, 0); font-weight: bold;">if</span> <span class="br0" style="color: rgb(0, 153, 0);">(</span>dew <span class="sy0" style="color: rgb(51, 153, 51);"><</span> <span class="sy0" style="color: rgb(51, 153, 51);">-</span>DEF_PI<span class="br0" style="color: rgb(0, 153, 0);">)</span></div></li><li class="li1" style="list-style: none; margin: 0px; padding: 0px; line-height: 21px; vertical-align: top;"><div class="de1"><span class="nu0" style="color: rgb(204, 102, 204);">21</span>.		<span class="me1" style="color: rgb(0, 102, 51);">dew</span> <span class="sy0" style="color: rgb(51, 153, 51);">=</span> DEF_2PI <span class="sy0" style="color: rgb(51, 153, 51);">+</span> dew<span class="sy0" style="color: rgb(51, 153, 51);">;</span></div></li><li class="li1" style="list-style: none; margin: 0px; padding: 0px; line-height: 21px; vertical-align: top;"><div class="de1"><span class="nu0" style="color: rgb(204, 102, 204);">22</span>.		<span class="me1" style="color: rgb(0, 102, 51);">dx</span> <span class="sy0" style="color: rgb(51, 153, 51);">=</span> DEF_R <span class="sy0" style="color: rgb(51, 153, 51);">*</span> <a target=_blank style="color: rgb(0, 136, 204); text-decoration: none;" href="http://www.google.com/search?hl=en&q=allinurl%3Amath+java.sun.com&btnI=I%27m%20Feeling%20Lucky"><span class="kw3" style="color: rgb(0, 51, 153);">Math</span></a>.<span class="me1" style="color: rgb(0, 102, 51);">cos</span><span class="br0" style="color: rgb(0, 153, 0);">(</span>ns1<span class="br0" style="color: rgb(0, 153, 0);">)</span> <span class="sy0" style="color: rgb(51, 153, 51);">*</span> dew<span class="sy0" style="color: rgb(51, 153, 51);">;</span> <span class="co1" style="color: rgb(102, 102, 102); font-style: italic;">// 东西方向长度(在纬度圈上的投影长度)</span></div></li><li class="li1" style="list-style: none; margin: 0px; padding: 0px; line-height: 21px; vertical-align: top;"><div class="de1"><span class="nu0" style="color: rgb(204, 102, 204);">23</span>.		<span class="me1" style="color: rgb(0, 102, 51);">dy</span> <span class="sy0" style="color: rgb(51, 153, 51);">=</span> DEF_R <span class="sy0" style="color: rgb(51, 153, 51);">*</span> <span class="br0" style="color: rgb(0, 153, 0);">(</span>ns1 <span class="sy0" style="color: rgb(51, 153, 51);">-</span> ns2<span class="br0" style="color: rgb(0, 153, 0);">)</span><span class="sy0" style="color: rgb(51, 153, 51);">;</span> <span class="co1" style="color: rgb(102, 102, 102); font-style: italic;">// 南北方向长度(在经度圈上的投影长度)</span></div></li><li class="li1" style="list-style: none; margin: 0px; padding: 0px; line-height: 21px; vertical-align: top;"><div class="de1"><span class="nu0" style="color: rgb(204, 102, 204);">24</span>.		<span class="co1" style="color: rgb(102, 102, 102); font-style: italic;">// 勾股定理求斜边长</span></div></li><li class="li1" style="list-style: none; margin: 0px; padding: 0px; line-height: 21px; vertical-align: top;"><div class="de1"><span class="nu0" style="color: rgb(204, 102, 204);">25</span>.		<span class="me1" style="color: rgb(0, 102, 51);">distance</span> <span class="sy0" style="color: rgb(51, 153, 51);">=</span> <a target=_blank style="color: rgb(0, 136, 204); text-decoration: none;" href="http://www.google.com/search?hl=en&q=allinurl%3Amath+java.sun.com&btnI=I%27m%20Feeling%20Lucky"><span class="kw3" style="color: rgb(0, 51, 153);">Math</span></a>.<span class="me1" style="color: rgb(0, 102, 51);">sqrt</span><span class="br0" style="color: rgb(0, 153, 0);">(</span>dx <span class="sy0" style="color: rgb(51, 153, 51);">*</span> dx <span class="sy0" style="color: rgb(51, 153, 51);">+</span> dy <span class="sy0" style="color: rgb(51, 153, 51);">*</span> dy<span class="br0" style="color: rgb(0, 153, 0);">)</span><span class="sy0" style="color: rgb(51, 153, 51);">;</span></div></li><li class="li1" style="list-style: none; margin: 0px; padding: 0px; line-height: 21px; vertical-align: top;"><div class="de1"><span class="nu0" style="color: rgb(204, 102, 204);">26</span>.		<span class="kw1" style="color: rgb(0, 0, 0); font-weight: bold;">return</span> distance<span class="sy0" style="color: rgb(51, 153, 51);">;</span></div></li><li class="li1" style="list-style: none; margin: 0px; padding: 0px; line-height: 21px; vertical-align: top;"><div class="de1"><span class="nu0" style="color: rgb(204, 102, 204);">27</span>.	<span class="br0" style="color: rgb(0, 153, 0);">}</span></div></li><li class="li1" style="list-style: none; margin: 0px; padding: 0px; line-height: 21px; vertical-align: top;"><div class="de1"><span class="nu0" style="color: rgb(204, 102, 204);">28</span>.	<span class="kw1" style="color: rgb(0, 0, 0); font-weight: bold;">public</span> <span class="kw4" style="color: rgb(0, 0, 102); font-weight: bold;">double</span> GetLongDistance<span class="br0" style="color: rgb(0, 153, 0);">(</span><span class="kw4" style="color: rgb(0, 0, 102); font-weight: bold;">double</span> lon1, <span class="kw4" style="color: rgb(0, 0, 102); font-weight: bold;">double</span> lat1, <span class="kw4" style="color: rgb(0, 0, 102); font-weight: bold;">double</span> lon2, <span class="kw4" style="color: rgb(0, 0, 102); font-weight: bold;">double</span> lat2<span class="br0" style="color: rgb(0, 153, 0);">)</span></div></li><li class="li1" style="list-style: none; margin: 0px; padding: 0px; line-height: 21px; vertical-align: top;"><div class="de1"><span class="nu0" style="color: rgb(204, 102, 204);">29</span>.	<span class="br0" style="color: rgb(0, 153, 0);">{</span></div></li><li class="li1" style="list-style: none; margin: 0px; padding: 0px; line-height: 21px; vertical-align: top;"><div class="de1"><span class="nu0" style="color: rgb(204, 102, 204);">30</span>.		<span class="kw4" style="color: rgb(0, 0, 102); font-weight: bold;">double</span> ew1, ns1, ew2, ns2<span class="sy0" style="color: rgb(51, 153, 51);">;</span></div></li><li class="li1" style="list-style: none; margin: 0px; padding: 0px; line-height: 21px; vertical-align: top;"><div class="de1"><span class="nu0" style="color: rgb(204, 102, 204);">31</span>.		<span class="kw4" style="color: rgb(0, 0, 102); font-weight: bold;">double</span> distance<span class="sy0" style="color: rgb(51, 153, 51);">;</span></div></li><li class="li1" style="list-style: none; margin: 0px; padding: 0px; line-height: 21px; vertical-align: top;"><div class="de1"><span class="nu0" style="color: rgb(204, 102, 204);">32</span>.		<span class="co1" style="color: rgb(102, 102, 102); font-style: italic;">// 角度转换为弧度</span></div></li><li class="li1" style="list-style: none; margin: 0px; padding: 0px; line-height: 21px; vertical-align: top;"><div class="de1"><span class="nu0" style="color: rgb(204, 102, 204);">33</span>.		<span class="me1" style="color: rgb(0, 102, 51);">ew1</span> <span class="sy0" style="color: rgb(51, 153, 51);">=</span> lon1 <span class="sy0" style="color: rgb(51, 153, 51);">*</span> DEF_PI180<span class="sy0" style="color: rgb(51, 153, 51);">;</span></div></li><li class="li1" style="list-style: none; margin: 0px; padding: 0px; line-height: 21px; vertical-align: top;"><div class="de1"><span class="nu0" style="color: rgb(204, 102, 204);">34</span>.		<span class="me1" style="color: rgb(0, 102, 51);">ns1</span> <span class="sy0" style="color: rgb(51, 153, 51);">=</span> lat1 <span class="sy0" style="color: rgb(51, 153, 51);">*</span> DEF_PI180<span class="sy0" style="color: rgb(51, 153, 51);">;</span></div></li><li class="li1" style="list-style: none; margin: 0px; padding: 0px; line-height: 21px; vertical-align: top;"><div class="de1"><span class="nu0" style="color: rgb(204, 102, 204);">35</span>.		<span class="me1" style="color: rgb(0, 102, 51);">ew2</span> <span class="sy0" style="color: rgb(51, 153, 51);">=</span> lon2 <span class="sy0" style="color: rgb(51, 153, 51);">*</span> DEF_PI180<span class="sy0" style="color: rgb(51, 153, 51);">;</span></div></li><li class="li1" style="list-style: none; margin: 0px; padding: 0px; line-height: 21px; vertical-align: top;"><div class="de1"><span class="nu0" style="color: rgb(204, 102, 204);">36</span>.		<span class="me1" style="color: rgb(0, 102, 51);">ns2</span> <span class="sy0" style="color: rgb(51, 153, 51);">=</span> lat2 <span class="sy0" style="color: rgb(51, 153, 51);">*</span> DEF_PI180<span class="sy0" style="color: rgb(51, 153, 51);">;</span></div></li><li class="li1" style="list-style: none; margin: 0px; padding: 0px; line-height: 21px; vertical-align: top;"><div class="de1"><span class="nu0" style="color: rgb(204, 102, 204);">37</span>.		<span class="co1" style="color: rgb(102, 102, 102); font-style: italic;">// 求大圆劣弧与球心所夹的角(弧度)</span></div></li><li class="li1" style="list-style: none; margin: 0px; padding: 0px; line-height: 21px; vertical-align: top;"><div class="de1"><span class="nu0" style="color: rgb(204, 102, 204);">38</span>.		<span class="me1" style="color: rgb(0, 102, 51);">distance</span> <span class="sy0" style="color: rgb(51, 153, 51);">=</span> <a target=_blank style="color: rgb(0, 136, 204); text-decoration: none;" href="http://www.google.com/search?hl=en&q=allinurl%3Amath+java.sun.com&btnI=I%27m%20Feeling%20Lucky"><span class="kw3" style="color: rgb(0, 51, 153);">Math</span></a>.<span class="me1" style="color: rgb(0, 102, 51);">sin</span><span class="br0" style="color: rgb(0, 153, 0);">(</span>ns1<span class="br0" style="color: rgb(0, 153, 0);">)</span> <span class="sy0" style="color: rgb(51, 153, 51);">*</span> <a target=_blank style="color: rgb(0, 136, 204); text-decoration: none;" href="http://www.google.com/search?hl=en&q=allinurl%3Amath+java.sun.com&btnI=I%27m%20Feeling%20Lucky"><span class="kw3" style="color: rgb(0, 51, 153);">Math</span></a>.<span class="me1" style="color: rgb(0, 102, 51);">sin</span><span class="br0" style="color: rgb(0, 153, 0);">(</span>ns2<span class="br0" style="color: rgb(0, 153, 0);">)</span> <span class="sy0" style="color: rgb(51, 153, 51);">+</span> <a target=_blank style="color: rgb(0, 136, 204); text-decoration: none;" href="http://www.google.com/search?hl=en&q=allinurl%3Amath+java.sun.com&btnI=I%27m%20Feeling%20Lucky"><span class="kw3" style="color: rgb(0, 51, 153);">Math</span></a>.<span class="me1" style="color: rgb(0, 102, 51);">cos</span><span class="br0" style="color: rgb(0, 153, 0);">(</span>ns1<span class="br0" style="color: rgb(0, 153, 0);">)</span> <span class="sy0" style="color: rgb(51, 153, 51);">*</span> <a target=_blank style="color: rgb(0, 136, 204); text-decoration: none;" href="http://www.google.com/search?hl=en&q=allinurl%3Amath+java.sun.com&btnI=I%27m%20Feeling%20Lucky"><span class="kw3" style="color: rgb(0, 51, 153);">Math</span></a>.<span class="me1" style="color: rgb(0, 102, 51);">cos</span><span class="br0" style="color: rgb(0, 153, 0);">(</span>ns2<span class="br0" style="color: rgb(0, 153, 0);">)</span> <span class="sy0" style="color: rgb(51, 153, 51);">*</span> <a target=_blank style="color: rgb(0, 136, 204); text-decoration: none;" href="http://www.google.com/search?hl=en&q=allinurl%3Amath+java.sun.com&btnI=I%27m%20Feeling%20Lucky"><span class="kw3" style="color: rgb(0, 51, 153);">Math</span></a>.<span class="me1" style="color: rgb(0, 102, 51);">cos</span><span class="br0" style="color: rgb(0, 153, 0);">(</span>ew1 <span class="sy0" style="color: rgb(51, 153, 51);">-</span> ew2<span class="br0" style="color: rgb(0, 153, 0);">)</span><span class="sy0" style="color: rgb(51, 153, 51);">;</span></div></li><li class="li1" style="list-style: none; margin: 0px; padding: 0px; line-height: 21px; vertical-align: top;"><div class="de1"><span class="nu0" style="color: rgb(204, 102, 204);">39</span>.		<span class="co1" style="color: rgb(102, 102, 102); font-style: italic;">// 调整到[-1..1]范围内，避免溢出</span></div></li><li class="li1" style="list-style: none; margin: 0px; padding: 0px; line-height: 21px; vertical-align: top;"><div class="de1"><span class="nu0" style="color: rgb(204, 102, 204);">40</span>.		<span class="kw1" style="color: rgb(0, 0, 0); font-weight: bold;">if</span> <span class="br0" style="color: rgb(0, 153, 0);">(</span>distance <span class="sy0" style="color: rgb(51, 153, 51);">></span> <span class="nu0" style="color: rgb(204, 102, 204);">1.0</span><span class="br0" style="color: rgb(0, 153, 0);">)</span></div></li><li class="li1" style="list-style: none; margin: 0px; padding: 0px; line-height: 21px; vertical-align: top;"><div class="de1"><span class="nu0" style="color: rgb(204, 102, 204);">41</span>.		     <span class="me1" style="color: rgb(0, 102, 51);">distance</span> <span class="sy0" style="color: rgb(51, 153, 51);">=</span> <span class="nu0" style="color: rgb(204, 102, 204);">1.0</span><span class="sy0" style="color: rgb(51, 153, 51);">;</span></div></li><li class="li1" style="list-style: none; margin: 0px; padding: 0px; line-height: 21px; vertical-align: top;"><div class="de1"><span class="nu0" style="color: rgb(204, 102, 204);">42</span>.		<span class="kw1" style="color: rgb(0, 0, 0); font-weight: bold;">else</span> <span class="kw1" style="color: rgb(0, 0, 0); font-weight: bold;">if</span> <span class="br0" style="color: rgb(0, 153, 0);">(</span>distance <span class="sy0" style="color: rgb(51, 153, 51);"><</span> <span class="sy0" style="color: rgb(51, 153, 51);">-</span><span class="nu0" style="color: rgb(204, 102, 204);">1.0</span><span class="br0" style="color: rgb(0, 153, 0);">)</span></div></li><li class="li1" style="list-style: none; margin: 0px; padding: 0px; line-height: 21px; vertical-align: top;"><div class="de1"><span class="nu0" style="color: rgb(204, 102, 204);">43</span>.		      <span class="me1" style="color: rgb(0, 102, 51);">distance</span> <span class="sy0" style="color: rgb(51, 153, 51);">=</span> <span class="sy0" style="color: rgb(51, 153, 51);">-</span><span class="nu0" style="color: rgb(204, 102, 204);">1.0</span><span class="sy0" style="color: rgb(51, 153, 51);">;</span></div></li><li class="li1" style="list-style: none; margin: 0px; padding: 0px; line-height: 21px; vertical-align: top;"><div class="de1"><span class="nu0" style="color: rgb(204, 102, 204);">44</span>.		<span class="co1" style="color: rgb(102, 102, 102); font-style: italic;">// 求大圆劣弧长度</span></div></li><li class="li1" style="list-style: none; margin: 0px; padding: 0px; line-height: 21px; vertical-align: top;"><div class="de1"><span class="nu0" style="color: rgb(204, 102, 204);">45</span>.		<span class="me1" style="color: rgb(0, 102, 51);">distance</span> <span class="sy0" style="color: rgb(51, 153, 51);">=</span> DEF_R <span class="sy0" style="color: rgb(51, 153, 51);">*</span> <a target=_blank style="color: rgb(0, 136, 204); text-decoration: none;" href="http://www.google.com/search?hl=en&q=allinurl%3Amath+java.sun.com&btnI=I%27m%20Feeling%20Lucky"><span class="kw3" style="color: rgb(0, 51, 153);">Math</span></a>.<span class="me1" style="color: rgb(0, 102, 51);">acos</span><span class="br0" style="color: rgb(0, 153, 0);">(</span>distance<span class="br0" style="color: rgb(0, 153, 0);">)</span><span class="sy0" style="color: rgb(51, 153, 51);">;</span></div></li><li class="li1" style="list-style: none; margin: 0px; padding: 0px; line-height: 21px; vertical-align: top;"><div class="de1"><span class="nu0" style="color: rgb(204, 102, 204);">46</span>.		<span class="kw1" style="color: rgb(0, 0, 0); font-weight: bold;">return</span> distance<span class="sy0" style="color: rgb(51, 153, 51);">;</span></div></li><li class="li1" style="list-style: none; margin: 0px; padding: 0px; line-height: 21px; vertical-align: top;"><div class="de1"><span class="nu0" style="color: rgb(204, 102, 204);">47</span>.	<span class="br0" style="color: rgb(0, 153, 0);">}</span></div></li><li class="li1" style="list-style: none; margin: 0px; padding: 0px; line-height: 21px; vertical-align: top;"><div class="de1"><span class="nu0" style="color: rgb(204, 102, 204);">48</span>.	<span class="kw4" style="color: rgb(0, 0, 102); font-weight: bold;">double</span> mLat1 <span class="sy0" style="color: rgb(51, 153, 51);">=</span> <span class="nu0" style="color: rgb(204, 102, 204);">39.90923</span><span class="sy0" style="color: rgb(51, 153, 51);">;</span> <span class="co1" style="color: rgb(102, 102, 102); font-style: italic;">// point1纬度</span></div></li><li class="li1" style="list-style: none; margin: 0px; padding: 0px; line-height: 21px; vertical-align: top;"><div class="de1"><span class="nu0" style="color: rgb(204, 102, 204);">49</span>.	<span class="kw4" style="color: rgb(0, 0, 102); font-weight: bold;">double</span> mLon1 <span class="sy0" style="color: rgb(51, 153, 51);">=</span> <span class="nu0" style="color: rgb(204, 102, 204);">116.357428</span><span class="sy0" style="color: rgb(51, 153, 51);">;</span> <span class="co1" style="color: rgb(102, 102, 102); font-style: italic;">// point1经度</span></div></li><li class="li1" style="list-style: none; margin: 0px; padding: 0px; line-height: 21px; vertical-align: top;"><div class="de1"><span class="nu0" style="color: rgb(204, 102, 204);">50</span>.	<span class="kw4" style="color: rgb(0, 0, 102); font-weight: bold;">double</span> mLat2 <span class="sy0" style="color: rgb(51, 153, 51);">=</span> <span class="nu0" style="color: rgb(204, 102, 204);">39.90923</span><span class="sy0" style="color: rgb(51, 153, 51);">;</span><span class="co1" style="color: rgb(102, 102, 102); font-style: italic;">// point2纬度</span></div></li><li class="li1" style="list-style: none; margin: 0px; padding: 0px; line-height: 21px; vertical-align: top;"><div class="de1"><span class="nu0" style="color: rgb(204, 102, 204);">51</span>.	<span class="kw4" style="color: rgb(0, 0, 102); font-weight: bold;">double</span> mLon2 <span class="sy0" style="color: rgb(51, 153, 51);">=</span> <span class="nu0" style="color: rgb(204, 102, 204);">116.397428</span><span class="sy0" style="color: rgb(51, 153, 51);">;</span><span class="co1" style="color: rgb(102, 102, 102); font-style: italic;">// point2经度</span></div></li><li class="li1" style="list-style: none; margin: 0px; padding: 0px; line-height: 21px; vertical-align: top;"><div class="de1"><span class="nu0" style="color: rgb(204, 102, 204);">52</span>.	<span class="kw4" style="color: rgb(0, 0, 102); font-weight: bold;">double</span> distance <span class="sy0" style="color: rgb(51, 153, 51);">=</span> GetShortDistance<span class="br0" style="color: rgb(0, 153, 0);">(</span>mLon1, mLat1, mLon2, mLat2<span class="br0" style="color: rgb(0, 153, 0);">)</span><span class="sy0" style="color: rgb(51, 153, 51);">;</span></div></li></ol>

路线规划提供了获取路线距离的方法，见MKRoutePlan 类的 getDistance 方法。

如果是计算任意两点的距离，自2.0.0版本开始，Android SDK为开发者提供了计算距离的接口（DistanceUtil），具体使用方法如下：

1.GeoPoint p1LL = new GeoPoint(39971802, 116347927);

2.GeoPoint p2LL = new GeoPoint(39892131, 116498555);

3.double distance = DistanceUtil.getDistance(p1LL, p2LL);

如果开发者使用的是1.3.5及以前的版本，在计算任意两点之前的距离时，有如下两种方法：一种利用勾股定理计算，适用于两点距离很近的情况；一种按标准的球面大圆劣弧长度计算，适用于距离较远的情况。

<ol style="margin: 0px; padding: 0px;"><li class="li1" style="list-style: none; margin: 0px; padding: 0px; line-height: 21px; vertical-align: top;"><div class="de1"><span class="nu0" style="color: rgb(204, 102, 204);">1</span>.	<span class="kw1" style="color: rgb(0, 0, 0); font-weight: bold;">static</span> <span class="kw4" style="color: rgb(0, 0, 102); font-weight: bold;">double</span> DEF_PI <span class="sy0" style="color: rgb(51, 153, 51);">=</span> <span class="nu0" style="color: rgb(204, 102, 204);">3.14159265359</span><span class="sy0" style="color: rgb(51, 153, 51);">;</span> <span class="co1" style="color: rgb(102, 102, 102); font-style: italic;">// PI</span></div></li><li class="li1" style="list-style: none; margin: 0px; padding: 0px; line-height: 21px; vertical-align: top;"><div class="de1"><span class="nu0" style="color: rgb(204, 102, 204);">2</span>.	<span class="kw1" style="color: rgb(0, 0, 0); font-weight: bold;">static</span> <span class="kw4" style="color: rgb(0, 0, 102); font-weight: bold;">double</span> DEF_2PI<span class="sy0" style="color: rgb(51, 153, 51);">=</span> <span class="nu0" style="color: rgb(204, 102, 204);">6.28318530712</span><span class="sy0" style="color: rgb(51, 153, 51);">;</span> <span class="co1" style="color: rgb(102, 102, 102); font-style: italic;">// 2*PI</span></div></li><li class="li1" style="list-style: none; margin: 0px; padding: 0px; line-height: 21px; vertical-align: top;"><div class="de1"><span class="nu0" style="color: rgb(204, 102, 204);">3</span>.	<span class="kw1" style="color: rgb(0, 0, 0); font-weight: bold;">static</span> <span class="kw4" style="color: rgb(0, 0, 102); font-weight: bold;">double</span> DEF_PI180<span class="sy0" style="color: rgb(51, 153, 51);">=</span> <span class="nu0" style="color: rgb(204, 102, 204);">0.01745329252</span><span class="sy0" style="color: rgb(51, 153, 51);">;</span> <span class="co1" style="color: rgb(102, 102, 102); font-style: italic;">// PI/180.0</span></div></li><li class="li1" style="list-style: none; margin: 0px; padding: 0px; line-height: 21px; vertical-align: top;"><div class="de1"><span class="nu0" style="color: rgb(204, 102, 204);">4</span>.	<span class="kw1" style="color: rgb(0, 0, 0); font-weight: bold;">static</span> <span class="kw4" style="color: rgb(0, 0, 102); font-weight: bold;">double</span> DEF_R <span class="sy0" style="color: rgb(51, 153, 51);">=</span><span class="nu0" style="color: rgb(204, 102, 204);">6370693.5</span><span class="sy0" style="color: rgb(51, 153, 51);">;</span> <span class="co1" style="color: rgb(102, 102, 102); font-style: italic;">// radius of earth</span></div></li><li class="li1" style="list-style: none; margin: 0px; padding: 0px; line-height: 21px; vertical-align: top;"><div class="de1"><span class="nu0" style="color: rgb(204, 102, 204);">5</span>.	<span class="kw1" style="color: rgb(0, 0, 0); font-weight: bold;">public</span> <span class="kw4" style="color: rgb(0, 0, 102); font-weight: bold;">double</span> GetShortDistance<span class="br0" style="color: rgb(0, 153, 0);">(</span><span class="kw4" style="color: rgb(0, 0, 102); font-weight: bold;">double</span> lon1, <span class="kw4" style="color: rgb(0, 0, 102); font-weight: bold;">double</span> lat1, <span class="kw4" style="color: rgb(0, 0, 102); font-weight: bold;">double</span> lon2, <span class="kw4" style="color: rgb(0, 0, 102); font-weight: bold;">double</span> lat2<span class="br0" style="color: rgb(0, 153, 0);">)</span></div></li><li class="li1" style="list-style: none; margin: 0px; padding: 0px; line-height: 21px; vertical-align: top;"><div class="de1"><span class="nu0" style="color: rgb(204, 102, 204);">6</span>.	<span class="br0" style="color: rgb(0, 153, 0);">{</span></div></li><li class="li1" style="list-style: none; margin: 0px; padding: 0px; line-height: 21px; vertical-align: top;"><div class="de1"><span class="nu0" style="color: rgb(204, 102, 204);">7</span>.		<span class="kw4" style="color: rgb(0, 0, 102); font-weight: bold;">double</span> ew1, ns1, ew2, ns2<span class="sy0" style="color: rgb(51, 153, 51);">;</span></div></li><li class="li1" style="list-style: none; margin: 0px; padding: 0px; line-height: 21px; vertical-align: top;"><div class="de1"><span class="nu0" style="color: rgb(204, 102, 204);">8</span>.		<span class="kw4" style="color: rgb(0, 0, 102); font-weight: bold;">double</span> dx, dy, dew<span class="sy0" style="color: rgb(51, 153, 51);">;</span></div></li><li class="li1" style="list-style: none; margin: 0px; padding: 0px; line-height: 21px; vertical-align: top;"><div class="de1"><span class="nu0" style="color: rgb(204, 102, 204);">9</span>.		<span class="kw4" style="color: rgb(0, 0, 102); font-weight: bold;">double</span> distance<span class="sy0" style="color: rgb(51, 153, 51);">;</span></div></li><li class="li1" style="list-style: none; margin: 0px; padding: 0px; line-height: 21px; vertical-align: top;"><div class="de1"><span class="nu0" style="color: rgb(204, 102, 204);">10</span>.		<span class="co1" style="color: rgb(102, 102, 102); font-style: italic;">// 角度转换为弧度</span></div></li><li class="li1" style="list-style: none; margin: 0px; padding: 0px; line-height: 21px; vertical-align: top;"><div class="de1"><span class="nu0" style="color: rgb(204, 102, 204);">11</span>.		<span class="me1" style="color: rgb(0, 102, 51);">ew1</span> <span class="sy0" style="color: rgb(51, 153, 51);">=</span> lon1 <span class="sy0" style="color: rgb(51, 153, 51);">*</span> DEF_PI180<span class="sy0" style="color: rgb(51, 153, 51);">;</span></div></li><li class="li1" style="list-style: none; margin: 0px; padding: 0px; line-height: 21px; vertical-align: top;"><div class="de1"><span class="nu0" style="color: rgb(204, 102, 204);">12</span>.		<span class="me1" style="color: rgb(0, 102, 51);">ns1</span> <span class="sy0" style="color: rgb(51, 153, 51);">=</span> lat1 <span class="sy0" style="color: rgb(51, 153, 51);">*</span> DEF_PI180<span class="sy0" style="color: rgb(51, 153, 51);">;</span></div></li><li class="li1" style="list-style: none; margin: 0px; padding: 0px; line-height: 21px; vertical-align: top;"><div class="de1"><span class="nu0" style="color: rgb(204, 102, 204);">13</span>.		<span class="me1" style="color: rgb(0, 102, 51);">ew2</span> <span class="sy0" style="color: rgb(51, 153, 51);">=</span> lon2 <span class="sy0" style="color: rgb(51, 153, 51);">*</span> DEF_PI180<span class="sy0" style="color: rgb(51, 153, 51);">;</span></div></li><li class="li1" style="list-style: none; margin: 0px; padding: 0px; line-height: 21px; vertical-align: top;"><div class="de1"><span class="nu0" style="color: rgb(204, 102, 204);">14</span>.		<span class="me1" style="color: rgb(0, 102, 51);">ns2</span> <span class="sy0" style="color: rgb(51, 153, 51);">=</span> lat2 <span class="sy0" style="color: rgb(51, 153, 51);">*</span> DEF_PI180<span class="sy0" style="color: rgb(51, 153, 51);">;</span></div></li><li class="li1" style="list-style: none; margin: 0px; padding: 0px; line-height: 21px; vertical-align: top;"><div class="de1"><span class="nu0" style="color: rgb(204, 102, 204);">15</span>.		<span class="co1" style="color: rgb(102, 102, 102); font-style: italic;">// 经度差</span></div></li><li class="li1" style="list-style: none; margin: 0px; padding: 0px; line-height: 21px; vertical-align: top;"><div class="de1"><span class="nu0" style="color: rgb(204, 102, 204);">16</span>.		<span class="me1" style="color: rgb(0, 102, 51);">dew</span> <span class="sy0" style="color: rgb(51, 153, 51);">=</span> ew1 <span class="sy0" style="color: rgb(51, 153, 51);">-</span> ew2<span class="sy0" style="color: rgb(51, 153, 51);">;</span></div></li><li class="li1" style="list-style: none; margin: 0px; padding: 0px; line-height: 21px; vertical-align: top;"><div class="de1"><span class="nu0" style="color: rgb(204, 102, 204);">17</span>.		<span class="co1" style="color: rgb(102, 102, 102); font-style: italic;">// 若跨东经和西经180 度，进行调整</span></div></li><li class="li1" style="list-style: none; margin: 0px; padding: 0px; line-height: 21px; vertical-align: top;"><div class="de1"><span class="nu0" style="color: rgb(204, 102, 204);">18</span>.		<span class="kw1" style="color: rgb(0, 0, 0); font-weight: bold;">if</span> <span class="br0" style="color: rgb(0, 153, 0);">(</span>dew <span class="sy0" style="color: rgb(51, 153, 51);">></span> DEF_PI<span class="br0" style="color: rgb(0, 153, 0);">)</span></div></li><li class="li1" style="list-style: none; margin: 0px; padding: 0px; line-height: 21px; vertical-align: top;"><div class="de1"><span class="nu0" style="color: rgb(204, 102, 204);">19</span>.		<span class="me1" style="color: rgb(0, 102, 51);">dew</span> <span class="sy0" style="color: rgb(51, 153, 51);">=</span> DEF_2PI <span class="sy0" style="color: rgb(51, 153, 51);">-</span> dew<span class="sy0" style="color: rgb(51, 153, 51);">;</span></div></li><li class="li1" style="list-style: none; margin: 0px; padding: 0px; line-height: 21px; vertical-align: top;"><div class="de1"><span class="nu0" style="color: rgb(204, 102, 204);">20</span>.		<span class="kw1" style="color: rgb(0, 0, 0); font-weight: bold;">else</span> <span class="kw1" style="color: rgb(0, 0, 0); font-weight: bold;">if</span> <span class="br0" style="color: rgb(0, 153, 0);">(</span>dew <span class="sy0" style="color: rgb(51, 153, 51);"><</span> <span class="sy0" style="color: rgb(51, 153, 51);">-</span>DEF_PI<span class="br0" style="color: rgb(0, 153, 0);">)</span></div></li><li class="li1" style="list-style: none; margin: 0px; padding: 0px; line-height: 21px; vertical-align: top;"><div class="de1"><span class="nu0" style="color: rgb(204, 102, 204);">21</span>.		<span class="me1" style="color: rgb(0, 102, 51);">dew</span> <span class="sy0" style="color: rgb(51, 153, 51);">=</span> DEF_2PI <span class="sy0" style="color: rgb(51, 153, 51);">+</span> dew<span class="sy0" style="color: rgb(51, 153, 51);">;</span></div></li><li class="li1" style="list-style: none; margin: 0px; padding: 0px; line-height: 21px; vertical-align: top;"><div class="de1"><span class="nu0" style="color: rgb(204, 102, 204);">22</span>.		<span class="me1" style="color: rgb(0, 102, 51);">dx</span> <span class="sy0" style="color: rgb(51, 153, 51);">=</span> DEF_R <span class="sy0" style="color: rgb(51, 153, 51);">*</span> <a target=_blank style="color: rgb(0, 136, 204); text-decoration: none;" href="http://www.google.com/search?hl=en&q=allinurl%3Amath+java.sun.com&btnI=I%27m%20Feeling%20Lucky"><span class="kw3" style="color: rgb(0, 51, 153);">Math</span></a>.<span class="me1" style="color: rgb(0, 102, 51);">cos</span><span class="br0" style="color: rgb(0, 153, 0);">(</span>ns1<span class="br0" style="color: rgb(0, 153, 0);">)</span> <span class="sy0" style="color: rgb(51, 153, 51);">*</span> dew<span class="sy0" style="color: rgb(51, 153, 51);">;</span> <span class="co1" style="color: rgb(102, 102, 102); font-style: italic;">// 东西方向长度(在纬度圈上的投影长度)</span></div></li><li class="li1" style="list-style: none; margin: 0px; padding: 0px; line-height: 21px; vertical-align: top;"><div class="de1"><span class="nu0" style="color: rgb(204, 102, 204);">23</span>.		<span class="me1" style="color: rgb(0, 102, 51);">dy</span> <span class="sy0" style="color: rgb(51, 153, 51);">=</span> DEF_R <span class="sy0" style="color: rgb(51, 153, 51);">*</span> <span class="br0" style="color: rgb(0, 153, 0);">(</span>ns1 <span class="sy0" style="color: rgb(51, 153, 51);">-</span> ns2<span class="br0" style="color: rgb(0, 153, 0);">)</span><span class="sy0" style="color: rgb(51, 153, 51);">;</span> <span class="co1" style="color: rgb(102, 102, 102); font-style: italic;">// 南北方向长度(在经度圈上的投影长度)</span></div></li><li class="li1" style="list-style: none; margin: 0px; padding: 0px; line-height: 21px; vertical-align: top;"><div class="de1"><span class="nu0" style="color: rgb(204, 102, 204);">24</span>.		<span class="co1" style="color: rgb(102, 102, 102); font-style: italic;">// 勾股定理求斜边长</span></div></li><li class="li1" style="list-style: none; margin: 0px; padding: 0px; line-height: 21px; vertical-align: top;"><div class="de1"><span class="nu0" style="color: rgb(204, 102, 204);">25</span>.		<span class="me1" style="color: rgb(0, 102, 51);">distance</span> <span class="sy0" style="color: rgb(51, 153, 51);">=</span> <a target=_blank style="color: rgb(0, 136, 204); text-decoration: none;" href="http://www.google.com/search?hl=en&q=allinurl%3Amath+java.sun.com&btnI=I%27m%20Feeling%20Lucky"><span class="kw3" style="color: rgb(0, 51, 153);">Math</span></a>.<span class="me1" style="color: rgb(0, 102, 51);">sqrt</span><span class="br0" style="color: rgb(0, 153, 0);">(</span>dx <span class="sy0" style="color: rgb(51, 153, 51);">*</span> dx <span class="sy0" style="color: rgb(51, 153, 51);">+</span> dy <span class="sy0" style="color: rgb(51, 153, 51);">*</span> dy<span class="br0" style="color: rgb(0, 153, 0);">)</span><span class="sy0" style="color: rgb(51, 153, 51);">;</span></div></li><li class="li1" style="list-style: none; margin: 0px; padding: 0px; line-height: 21px; vertical-align: top;"><div class="de1"><span class="nu0" style="color: rgb(204, 102, 204);">26</span>.		<span class="kw1" style="color: rgb(0, 0, 0); font-weight: bold;">return</span> distance<span class="sy0" style="color: rgb(51, 153, 51);">;</span></div></li><li class="li1" style="list-style: none; margin: 0px; padding: 0px; line-height: 21px; vertical-align: top;"><div class="de1"><span class="nu0" style="color: rgb(204, 102, 204);">27</span>.	<span class="br0" style="color: rgb(0, 153, 0);">}</span></div></li><li class="li1" style="list-style: none; margin: 0px; padding: 0px; line-height: 21px; vertical-align: top;"><div class="de1"><span class="nu0" style="color: rgb(204, 102, 204);">28</span>.	<span class="kw1" style="color: rgb(0, 0, 0); font-weight: bold;">public</span> <span class="kw4" style="color: rgb(0, 0, 102); font-weight: bold;">double</span> GetLongDistance<span class="br0" style="color: rgb(0, 153, 0);">(</span><span class="kw4" style="color: rgb(0, 0, 102); font-weight: bold;">double</span> lon1, <span class="kw4" style="color: rgb(0, 0, 102); font-weight: bold;">double</span> lat1, <span class="kw4" style="color: rgb(0, 0, 102); font-weight: bold;">double</span> lon2, <span class="kw4" style="color: rgb(0, 0, 102); font-weight: bold;">double</span> lat2<span class="br0" style="color: rgb(0, 153, 0);">)</span></div></li><li class="li1" style="list-style: none; margin: 0px; padding: 0px; line-height: 21px; vertical-align: top;"><div class="de1"><span class="nu0" style="color: rgb(204, 102, 204);">29</span>.	<span class="br0" style="color: rgb(0, 153, 0);">{</span></div></li><li class="li1" style="list-style: none; margin: 0px; padding: 0px; line-height: 21px; vertical-align: top;"><div class="de1"><span class="nu0" style="color: rgb(204, 102, 204);">30</span>.		<span class="kw4" style="color: rgb(0, 0, 102); font-weight: bold;">double</span> ew1, ns1, ew2, ns2<span class="sy0" style="color: rgb(51, 153, 51);">;</span></div></li><li class="li1" style="list-style: none; margin: 0px; padding: 0px; line-height: 21px; vertical-align: top;"><div class="de1"><span class="nu0" style="color: rgb(204, 102, 204);">31</span>.		<span class="kw4" style="color: rgb(0, 0, 102); font-weight: bold;">double</span> distance<span class="sy0" style="color: rgb(51, 153, 51);">;</span></div></li><li class="li1" style="list-style: none; margin: 0px; padding: 0px; line-height: 21px; vertical-align: top;"><div class="de1"><span class="nu0" style="color: rgb(204, 102, 204);">32</span>.		<span class="co1" style="color: rgb(102, 102, 102); font-style: italic;">// 角度转换为弧度</span></div></li><li class="li1" style="list-style: none; margin: 0px; padding: 0px; line-height: 21px; vertical-align: top;"><div class="de1"><span class="nu0" style="color: rgb(204, 102, 204);">33</span>.		<span class="me1" style="color: rgb(0, 102, 51);">ew1</span> <span class="sy0" style="color: rgb(51, 153, 51);">=</span> lon1 <span class="sy0" style="color: rgb(51, 153, 51);">*</span> DEF_PI180<span class="sy0" style="color: rgb(51, 153, 51);">;</span></div></li><li class="li1" style="list-style: none; margin: 0px; padding: 0px; line-height: 21px; vertical-align: top;"><div class="de1"><span class="nu0" style="color: rgb(204, 102, 204);">34</span>.		<span class="me1" style="color: rgb(0, 102, 51);">ns1</span> <span class="sy0" style="color: rgb(51, 153, 51);">=</span> lat1 <span class="sy0" style="color: rgb(51, 153, 51);">*</span> DEF_PI180<span class="sy0" style="color: rgb(51, 153, 51);">;</span></div></li><li class="li1" style="list-style: none; margin: 0px; padding: 0px; line-height: 21px; vertical-align: top;"><div class="de1"><span class="nu0" style="color: rgb(204, 102, 204);">35</span>.		<span class="me1" style="color: rgb(0, 102, 51);">ew2</span> <span class="sy0" style="color: rgb(51, 153, 51);">=</span> lon2 <span class="sy0" style="color: rgb(51, 153, 51);">*</span> DEF_PI180<span class="sy0" style="color: rgb(51, 153, 51);">;</span></div></li><li class="li1" style="list-style: none; margin: 0px; padding: 0px; line-height: 21px; vertical-align: top;"><div class="de1"><span class="nu0" style="color: rgb(204, 102, 204);">36</span>.		<span class="me1" style="color: rgb(0, 102, 51);">ns2</span> <span class="sy0" style="color: rgb(51, 153, 51);">=</span> lat2 <span class="sy0" style="color: rgb(51, 153, 51);">*</span> DEF_PI180<span class="sy0" style="color: rgb(51, 153, 51);">;</span></div></li><li class="li1" style="list-style: none; margin: 0px; padding: 0px; line-height: 21px; vertical-align: top;"><div class="de1"><span class="nu0" style="color: rgb(204, 102, 204);">37</span>.		<span class="co1" style="color: rgb(102, 102, 102); font-style: italic;">// 求大圆劣弧与球心所夹的角(弧度)</span></div></li><li class="li1" style="list-style: none; margin: 0px; padding: 0px; line-height: 21px; vertical-align: top;"><div class="de1"><span class="nu0" style="color: rgb(204, 102, 204);">38</span>.		<span class="me1" style="color: rgb(0, 102, 51);">distance</span> <span class="sy0" style="color: rgb(51, 153, 51);">=</span> <a target=_blank style="color: rgb(0, 136, 204); text-decoration: none;" href="http://www.google.com/search?hl=en&q=allinurl%3Amath+java.sun.com&btnI=I%27m%20Feeling%20Lucky"><span class="kw3" style="color: rgb(0, 51, 153);">Math</span></a>.<span class="me1" style="color: rgb(0, 102, 51);">sin</span><span class="br0" style="color: rgb(0, 153, 0);">(</span>ns1<span class="br0" style="color: rgb(0, 153, 0);">)</span> <span class="sy0" style="color: rgb(51, 153, 51);">*</span> <a target=_blank style="color: rgb(0, 136, 204); text-decoration: none;" href="http://www.google.com/search?hl=en&q=allinurl%3Amath+java.sun.com&btnI=I%27m%20Feeling%20Lucky"><span class="kw3" style="color: rgb(0, 51, 153);">Math</span></a>.<span class="me1" style="color: rgb(0, 102, 51);">sin</span><span class="br0" style="color: rgb(0, 153, 0);">(</span>ns2<span class="br0" style="color: rgb(0, 153, 0);">)</span> <span class="sy0" style="color: rgb(51, 153, 51);">+</span> <a target=_blank style="color: rgb(0, 136, 204); text-decoration: none;" href="http://www.google.com/search?hl=en&q=allinurl%3Amath+java.sun.com&btnI=I%27m%20Feeling%20Lucky"><span class="kw3" style="color: rgb(0, 51, 153);">Math</span></a>.<span class="me1" style="color: rgb(0, 102, 51);">cos</span><span class="br0" style="color: rgb(0, 153, 0);">(</span>ns1<span class="br0" style="color: rgb(0, 153, 0);">)</span> <span class="sy0" style="color: rgb(51, 153, 51);">*</span> <a target=_blank style="color: rgb(0, 136, 204); text-decoration: none;" href="http://www.google.com/search?hl=en&q=allinurl%3Amath+java.sun.com&btnI=I%27m%20Feeling%20Lucky"><span class="kw3" style="color: rgb(0, 51, 153);">Math</span></a>.<span class="me1" style="color: rgb(0, 102, 51);">cos</span><span class="br0" style="color: rgb(0, 153, 0);">(</span>ns2<span class="br0" style="color: rgb(0, 153, 0);">)</span> <span class="sy0" style="color: rgb(51, 153, 51);">*</span> <a target=_blank style="color: rgb(0, 136, 204); text-decoration: none;" href="http://www.google.com/search?hl=en&q=allinurl%3Amath+java.sun.com&btnI=I%27m%20Feeling%20Lucky"><span class="kw3" style="color: rgb(0, 51, 153);">Math</span></a>.<span class="me1" style="color: rgb(0, 102, 51);">cos</span><span class="br0" style="color: rgb(0, 153, 0);">(</span>ew1 <span class="sy0" style="color: rgb(51, 153, 51);">-</span> ew2<span class="br0" style="color: rgb(0, 153, 0);">)</span><span class="sy0" style="color: rgb(51, 153, 51);">;</span></div></li><li class="li1" style="list-style: none; margin: 0px; padding: 0px; line-height: 21px; vertical-align: top;"><div class="de1"><span class="nu0" style="color: rgb(204, 102, 204);">39</span>.		<span class="co1" style="color: rgb(102, 102, 102); font-style: italic;">// 调整到[-1..1]范围内，避免溢出</span></div></li><li class="li1" style="list-style: none; margin: 0px; padding: 0px; line-height: 21px; vertical-align: top;"><div class="de1"><span class="nu0" style="color: rgb(204, 102, 204);">40</span>.		<span class="kw1" style="color: rgb(0, 0, 0); font-weight: bold;">if</span> <span class="br0" style="color: rgb(0, 153, 0);">(</span>distance <span class="sy0" style="color: rgb(51, 153, 51);">></span> <span class="nu0" style="color: rgb(204, 102, 204);">1.0</span><span class="br0" style="color: rgb(0, 153, 0);">)</span></div></li><li class="li1" style="list-style: none; margin: 0px; padding: 0px; line-height: 21px; vertical-align: top;"><div class="de1"><span class="nu0" style="color: rgb(204, 102, 204);">41</span>.		     <span class="me1" style="color: rgb(0, 102, 51);">distance</span> <span class="sy0" style="color: rgb(51, 153, 51);">=</span> <span class="nu0" style="color: rgb(204, 102, 204);">1.0</span><span class="sy0" style="color: rgb(51, 153, 51);">;</span></div></li><li class="li1" style="list-style: none; margin: 0px; padding: 0px; line-height: 21px; vertical-align: top;"><div class="de1"><span class="nu0" style="color: rgb(204, 102, 204);">42</span>.		<span class="kw1" style="color: rgb(0, 0, 0); font-weight: bold;">else</span> <span class="kw1" style="color: rgb(0, 0, 0); font-weight: bold;">if</span> <span class="br0" style="color: rgb(0, 153, 0);">(</span>distance <span class="sy0" style="color: rgb(51, 153, 51);"><</span> <span class="sy0" style="color: rgb(51, 153, 51);">-</span><span class="nu0" style="color: rgb(204, 102, 204);">1.0</span><span class="br0" style="color: rgb(0, 153, 0);">)</span></div></li><li class="li1" style="list-style: none; margin: 0px; padding: 0px; line-height: 21px; vertical-align: top;"><div class="de1"><span class="nu0" style="color: rgb(204, 102, 204);">43</span>.		      <span class="me1" style="color: rgb(0, 102, 51);">distance</span> <span class="sy0" style="color: rgb(51, 153, 51);">=</span> <span class="sy0" style="color: rgb(51, 153, 51);">-</span><span class="nu0" style="color: rgb(204, 102, 204);">1.0</span><span class="sy0" style="color: rgb(51, 153, 51);">;</span></div></li><li class="li1" style="list-style: none; margin: 0px; padding: 0px; line-height: 21px; vertical-align: top;"><div class="de1"><span class="nu0" style="color: rgb(204, 102, 204);">44</span>.		<span class="co1" style="color: rgb(102, 102, 102); font-style: italic;">// 求大圆劣弧长度</span></div></li><li class="li1" style="list-style: none; margin: 0px; padding: 0px; line-height: 21px; vertical-align: top;"><div class="de1"><span class="nu0" style="color: rgb(204, 102, 204);">45</span>.		<span class="me1" style="color: rgb(0, 102, 51);">distance</span> <span class="sy0" style="color: rgb(51, 153, 51);">=</span> DEF_R <span class="sy0" style="color: rgb(51, 153, 51);">*</span> <a target=_blank style="color: rgb(0, 136, 204); text-decoration: none;" href="http://www.google.com/search?hl=en&q=allinurl%3Amath+java.sun.com&btnI=I%27m%20Feeling%20Lucky"><span class="kw3" style="color: rgb(0, 51, 153);">Math</span></a>.<span class="me1" style="color: rgb(0, 102, 51);">acos</span><span class="br0" style="color: rgb(0, 153, 0);">(</span>distance<span class="br0" style="color: rgb(0, 153, 0);">)</span><span class="sy0" style="color: rgb(51, 153, 51);">;</span></div></li><li class="li1" style="list-style: none; margin: 0px; padding: 0px; line-height: 21px; vertical-align: top;"><div class="de1"><span class="nu0" style="color: rgb(204, 102, 204);">46</span>.		<span class="kw1" style="color: rgb(0, 0, 0); font-weight: bold;">return</span> distance<span class="sy0" style="color: rgb(51, 153, 51);">;</span></div></li><li class="li1" style="list-style: none; margin: 0px; padding: 0px; line-height: 21px; vertical-align: top;"><div class="de1"><span class="nu0" style="color: rgb(204, 102, 204);">47</span>.	<span class="br0" style="color: rgb(0, 153, 0);">}</span></div></li><li class="li1" style="list-style: none; margin: 0px; padding: 0px; line-height: 21px; vertical-align: top;"><div class="de1"><span class="nu0" style="color: rgb(204, 102, 204);">48</span>.	<span class="kw4" style="color: rgb(0, 0, 102); font-weight: bold;">double</span> mLat1 <span class="sy0" style="color: rgb(51, 153, 51);">=</span> <span class="nu0" style="color: rgb(204, 102, 204);">39.90923</span><span class="sy0" style="color: rgb(51, 153, 51);">;</span> <span class="co1" style="color: rgb(102, 102, 102); font-style: italic;">// point1纬度</span></div></li><li class="li1" style="list-style: none; margin: 0px; padding: 0px; line-height: 21px; vertical-align: top;"><div class="de1"><span class="nu0" style="color: rgb(204, 102, 204);">49</span>.	<span class="kw4" style="color: rgb(0, 0, 102); font-weight: bold;">double</span> mLon1 <span class="sy0" style="color: rgb(51, 153, 51);">=</span> <span class="nu0" style="color: rgb(204, 102, 204);">116.357428</span><span class="sy0" style="color: rgb(51, 153, 51);">;</span> <span class="co1" style="color: rgb(102, 102, 102); font-style: italic;">// point1经度</span></div></li><li class="li1" style="list-style: none; margin: 0px; padding: 0px; line-height: 21px; vertical-align: top;"><div class="de1"><span class="nu0" style="color: rgb(204, 102, 204);">50</span>.	<span class="kw4" style="color: rgb(0, 0, 102); font-weight: bold;">double</span> mLat2 <span class="sy0" style="color: rgb(51, 153, 51);">=</span> <span class="nu0" style="color: rgb(204, 102, 204);">39.90923</span><span class="sy0" style="color: rgb(51, 153, 51);">;</span><span class="co1" style="color: rgb(102, 102, 102); font-style: italic;">// point2纬度</span></div></li><li class="li1" style="list-style: none; margin: 0px; padding: 0px; line-height: 21px; vertical-align: top;"><div class="de1"><span class="nu0" style="color: rgb(204, 102, 204);">51</span>.	<span class="kw4" style="color: rgb(0, 0, 102); font-weight: bold;">double</span> mLon2 <span class="sy0" style="color: rgb(51, 153, 51);">=</span> <span class="nu0" style="color: rgb(204, 102, 204);">116.397428</span><span class="sy0" style="color: rgb(51, 153, 51);">;</span><span class="co1" style="color: rgb(102, 102, 102); font-style: italic;">// point2经度</span></div></li><li class="li1" style="list-style: none; margin: 0px; padding: 0px; line-height: 21px; vertical-align: top;"><div class="de1"><span class="nu0" style="color: rgb(204, 102, 204);">52</span>.	<span class="kw4" style="color: rgb(0, 0, 102); font-weight: bold;">double</span> distance <span class="sy0" style="color: rgb(51, 153, 51);">=</span> GetShortDistance<span class="br0" style="color: rgb(0, 153, 0);">(</span>mLon1, mLat1, mLon2, mLat2<span class="br0" style="color: rgb(0, 153, 0);">)</span><span class="sy0" style="color: rgb(51, 153, 51);">;</span></div></li></ol>