百度地图如何计算两点之间距离

素颜马尾好姑娘i 2022-08-07 01:41 609阅读 0赞

# [百度地图如何计算两点之间距离 ][Link 1] #

分类： [ 算法][Link 2] 2013-05-08 23:39  15819人阅读 [评论][Link 3](4) 收藏 [举报][Link 4]

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

[Link 1]: http://blog.csdn.net/forlong401/article/details/8903142
[Link 2]: http://blog.csdn.net/forlong401/article/category/1302880
[Link 3]: http://blog.csdn.net/forlong401/article/details/8903142#comments
[Link 4]: http://blog.csdn.net/forlong401/article/details/8903142#report