PHP地理围栏
2020-11-12 18:20
3296
/**
* 围栏算法,判断坐标是否在围栏里(点越多越准确)
* @param array $fences 围栏数组 (左上->右上->右下->下) ['113.664673,34.810146','113.681667,34.796896','113.69231,34.794711','113.702009,34.809159']
* @param string $point 要判断的坐标
* @return mixed
*/
function in_fences($fences, $point) {
$nvert = count($fences);
$vertx = [];
$verty = [];
list($testy, $testx) = explode(',', $point);
foreach ($fences as $r) {
list($lng, $lat) = explode(',', $r);
$vertx[] = $lat;
$verty[] = $lng;
}
$i = $j = $c = 0;
for ($i = 0, $j = $nvert - 1; $i < $nvert; $j = $i++) {
if (( ($verty[$i] > $testy) != ($verty[$j] > $testy) ) &&
($testx < ($vertx[$j] - $vertx[$i]) * ($testy - $verty[$i]) / ($verty[$j] - $verty[$i]) + $vertx[$i]))
$c = !$c;
}
return $c;
}
$array = [
'113.65416,34.767857',
'113.733499,34.767857',
'113.732636,34.7274',
'113.650711,34.7274',
];
if (in_fences($array, '113.694404,34.751605')) {
echo 'Inside!';
} else {
echo 'Not inside!';
}
// Inside!
百度坐标拾取系统:
https://api.map.baidu.com/lbsapi/getpoint/index.html
腾讯坐标拾取系统:
https://lbs.qq.com/tool/getpoint/index.html
高德坐标拾取系统:
https://lbs.amap.com/console/show/picker
谷歌坐标拾取系统:
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