2020-06-03 两点经纬度计算距离-原理及SQL

Posted 2023-04-27

参考技术A

通过LBS采集可以获取到经度和纬度，由于地球是圆的，其实经纬度代表的是的是 角度 ，而非平面坐标。
统一常用名称如下：

高德地图定位网址：（经纬度查询106.6866,26.5477）
https://lbs.amap.com/console/show/picker

1.欧式距离 ：虽然经纬度是角度，但抽象看成平面坐标，同样能实现距离
round(sqrt(power((meridian_work-meridian_submit),2)+power((parallel_work-parallel_submit),2))*100000/1000.0,3) as euc_dst

2.弧长距离 ：通过地球的半径结合角度计算弧长距离
round(6378.137*2*asin(sqrt(power(sin((parallel_submit*pi()/180.0-parallel_work*pi()/180.0)/2),2)+cos(parallel_submit*pi()/180.0)*cos(parallel_work*pi()/180.0)*power(sin((meridian_submit*pi()/180.0-meridian_work*pi()/180.0)/2),2))),3) as lbs_dst

角度距离比较复杂，参考文献：
https://www.cnblogs.com/ycsfwhh/archive/2010/12/20/1911232.html
https://www.cnblogs.com/zhoug2020/p/8993750.html

根据两点的经纬度计算直线距离

<?php 
/**
*  @desc 根据两点间的经纬度计算距离
*  @param float $lat 纬度值
*  @param float $lng 经度值
*/
 function getDistance($lat1, $lng1, $lat2, $lng2)
 {
     $earthRadius = 6367000; //approximate radius of earth in meters

     /*
       Convert these degrees to radians
       to work with the formula
     */

     $lat1 = ($lat1 * pi() ) / 180;
     $lng1 = ($lng1 * pi() ) / 180;

     $lat2 = ($lat2 * pi() ) / 180;
     $lng2 = ($lng2 * pi() ) / 180;

     /*
       Using the
       Haversine formula

       http://en.wikipedia.org/wiki/Haversine_formula

       calculate the distance
     */

     $calcLongitude = $lng2 - $lng1;
     $calcLatitude = $lat2 - $lat1;
     $stepOne = pow(sin($calcLatitude / 2), 2) + cos($lat1) * cos($lat2) * pow(sin($calcLongitude / 2), 2);  $stepTwo = 2 * asin(min(1, sqrt($stepOne)));
     $calculatedDistance = $earthRadius * $stepTwo;

     return round($calculatedDistance);
 }

     $lat1=‘36.8274190000‘;
     $lng1=‘118.0484210000‘;
     $lat2=‘36.8419400000‘;
     $lng2=‘118.0494970000‘;
    echo  getDistance($lat1, $lng1, $lat2, $lng2);