根据已知坐标查询数据库方圆距离坐标内所有商家

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根据已知坐标查询数据库方圆距离坐标内所有商家

  /**
   * [position 根据已知坐标获取数据库方圆公里坐标]
   * @return [type] [description]
   */
   public function position()
      {
          //获取该点周围的4个点
          $distance = 3;//范围(单位千米)
          $lat = 36.708050;
          $lng = 119.121790;
          define('EARTH_RADIUS', 6371);//地球半径,平均半径为6371km
          $dlng = 2 * asin(sin($distance / (2 * EARTH_RADIUS)) / cos(deg2rad($lat)));
          $dlng = rad2deg($dlng);
          $dlat = $distance/EARTH_RADIUS;
          $dlat = rad2deg($dlat);
          $squares = array('left-top'=>array('lat'=>$lat + $dlat,'lng'=>$lng-$dlng),
                            'right-top'=>array('lat'=>$lat + $dlat, 'lng'=>$lng + $dlng),
                            'left-bottom'=>array('lat'=>$lat - $dlat, 'lng'=>$lng - $dlng),
                            'right-bottom'=>array('lat'=>$lat - $dlat, 'lng'=>$lng + $dlng)
                            );
          //从数库查询匹配的记录
          $info_position = \think\Db::name('shang_postion')
                                    ->where('lat','gt',$squares['right-bottom']['lat'])
                                    ->where('lat','lt',$squares['left-top']['lat'])
                                    ->where('lng','gt',$squares['left-top']['lng'])
                                    ->where('lng','lt',$squares['right-bottom']['lng'])
                                    ->find();

          var_dump($info_position);exit;

          //获取两点之间的距离
          function getDistanceBetweenPointsNew($latitude1, $longitude1, $latitude2, $longitude2) {
            $theta = $longitude1 - $longitude2;
            $miles = (sin(deg2rad($latitude1)) * sin(deg2rad($latitude2))) + (cos(deg2rad($latitude1)) * cos(deg2rad($latitude2)) * cos(deg2rad($theta)));
            $miles = acos($miles);
            $miles = rad2deg($miles);
            $miles = $miles * 60 * 1.1515;
            $feet = $miles * 5280;
            $yards = $feet / 3;
            $kilometers = $miles * 1.609344;
            $meters = $kilometers * 1000;
            return compact('miles','feet','yards','kilometers','meters');
          }
          $point1 = array('lat' => 40.770623, 'long' => -73.964367);
          $point2 = array('lat' => 40.758224, 'long' => -73.917404);
          $distance = getDistanceBetweenPointsNew($point1['lat'], $point1['long'], $point2['lat'], $point2['long']);
          foreach ($distance as $unit => $value) {
            echo $unit.': '.number_format($value,4).'<br />';
          }
      }

 

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  • 本文由 发表于 2018年3月20日11:22:51
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