PHP calculation Baidu Map Two GPS coordinates distance between the method, GPS coordinates _php tutorial

Source: Internet
Author: User

PHP calculate Baidu Map Two GPS coordinates distance between the method, GPS coordinates


In this paper, we describe the method of calculating the distance between two GPS coordinates of the Baidu map in PHP. Share to everyone for your reference.

The implementation method is as follows:

Copy CodeThe code is as follows:/**
* Calculate the distance between two coordinates (m)
* @param float $fP 1Lat starting point (latitude)
* @param float $fP 1Lon starting point (longitude)
* @param float $fP 2Lat end point (latitude)
* @param float $fP 2Lon end point (longitude)
* @return int
*/
function Distancebetween ($fP 1Lat, $fP 1Lon, $fP 2Lat, $fP 2Lon) {
$fEARTH _radius = 6378137;
Angle converted to radians
$fRadLon 1 = Deg2rad ($fP 1Lon);
$fRadLon 2 = Deg2rad ($fP 2Lon);
$fRadLat 1 = Deg2rad ($fP 1Lat);
$fRadLat 2 = Deg2rad ($fP 2Lat);
Calculate the difference between latitude and longitude
$fD 1 = ABS ($fRadLat 1-$fRadLat 2);
$fD 2 = ABS ($fRadLon 1-$fRadLon 2);
Distance calculation
$fP = Pow (sin ($fD 1/2), 2) +
cos ($fRadLat 1) * cos ($fRadLat 2) * POW (sin ($fD 2/2), 2);
Return Intval ($fEARTH _radius * 2 * ASIN (SQRT ($fP)) + 0.5);
}
/**
* Baidu coordinate system converted into standard GPS seating system
* @param float $lnglat coordinates (e.g.: 106.426, 29.553404)
* @return The standard GPS value after string conversion:
*/
function bd09lltowgs84 ($fLng, $fLat) {//longitude, Latitude
$lnglat = Explode (', ', $lnglat);
List ($x, $y) = $lnglat;
$Baidu _server = "http://api.map.baidu.com/ag/coord/convert?from=0&to=4&x={$x}&y={$y}";
$result = @file_get_contents ($Baidu _server);
$json = Json_decode ($result);
if ($json->error = = 0) {
$BX = Base64_decode ($json->x);
$by = Base64_decode ($json->y);
$GPS _x = 2 * $x-$BX;
$GPS _y = 2 * $y-$by;
return $GPS _x ', '. $GPS _y;//Longitude, latitude
}else
return $lnglat;
}

I hope this article is helpful to everyone's PHP programming.

http://www.bkjia.com/PHPjc/940496.html www.bkjia.com true http://www.bkjia.com/PHPjc/940496.html techarticle PHP calculate Baidu map Two GPS coordinates distance between the method, GPS coordinates in this paper, the example of the PHP calculation Baidu map Two GPS coordinates the distance between the method. Share to everyone for your reference. ...

  • Related Article

    Contact Us

    The content source of this page is from Internet, which doesn't represent Alibaba Cloud's opinion; products and services mentioned on that page don't have any relationship with Alibaba Cloud. If the content of the page makes you feel confusing, please write us an email, we will handle the problem within 5 days after receiving your email.

    If you find any instances of plagiarism from the community, please send an email to: info-contact@alibabacloud.com and provide relevant evidence. A staff member will contact you within 5 working days.

    A Free Trial That Lets You Build Big!

    Start building with 50+ products and up to 12 months usage for Elastic Compute Service

    • Sales Support

      1 on 1 presale consultation

    • After-Sales Support

      24/7 Technical Support 6 Free Tickets per Quarter Faster Response

    • Alibaba Cloud offers highly flexible support services tailored to meet your exact needs.