PHP應(yīng)用
<?php
define('PI',3.1415926535898);
define('EARTH_RADIUS',6378.137);
//計(jì)算范圍,可以做搜索用戶
function GetRange($lat,$lon,$raidus){
  //計(jì)算緯度
  $degree = (24901 * 1609) / 360.0;
  $dpmLat = 1 / $degree;
  $radiusLat = $dpmLat * $raidus;
  $minLat = $lat - $radiusLat; //得到最小緯度
  $maxLat = $lat + $radiusLat; //得到最大緯度
  //計(jì)算經(jīng)度
  $mpdLng = $degree * cos($lat * (PI / 180));
  $dpmLng = 1 / $mpdLng;
  $radiusLng = $dpmLng * $raidus;
  $minLng = $lon - $radiusLng; //得到最小經(jīng)度
  $maxLng = $lon + $radiusLng; //得到最大經(jīng)度
  //范圍
  $range = array(
    'minLat' => $minLat,
    'maxLat' => $maxLat,
    'minLon' => $minLng,
    'maxLon' => $maxLng
  );
  return $range;
}
//獲取2點(diǎn)之間的距離
function GetDistance($lat1, $lng1, $lat2, $lng2){
  $radLat1 = $lat1 * (PI / 180);
  $radLat2 = $lat2 * (PI / 180);
  $a = $radLat1 - $radLat2;
  $b = ($lng1 * (PI / 180)) - ($lng2 * (PI / 180));
  $s = 2 * asin(sqrt(pow(sin($a/2),2) + cos($radLat1)*cos($radLat2)*pow(sin($b/2),2)));
  $s = $s * EARTH_RADIUS;
  $s = round($s * 10000) / 10000;
  return $s;
}