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PHP implements the method of calculating the distance between Baidu map coordinates, PHP coordinates_PHP tutorial
PHP implements the method of calculating the distance between Baidu map coordinates, PHP coordinates_PHP tutorial
Jul 12, 2016 am 08:53 AM
php implements the method of calculating the distance between Baidu map coordinates, php coordinates
This article describes the example of php implementing the method of calculating the distance between Baidu map coordinates. Share it with everyone for your reference, the details are as follows:
The following is the code on the Internet, you need to make some modifications when using it
The first function is to obtain the range, the parameters are latitude, longitude and radius
The second function is to calculate the coordinate distance
<?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;
}
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I hope this article will be helpful to everyone in PHP programming.
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