多邊形內檢測地理座標PHP

Question

我有以下組座標：

24.086589258228027, 51.6796875: 
22.87744046489713, 52.6025390625: 
22.715390019335942, 55.1953125: 
21.90227796666864, 55.72265625: 
19.89072302399691, 54.9755859375: 
18.396230138028827, 48.4716796875: 
21.657428197370653, 46.58203125 

現在，如果我的座標設定（單LAT長套），我怎麼能檢測到該位置位於內部的多邊形區域還是不是？

Answer 1

這爲我工作

$polyX = array();//horizontal coordinates of corners 
$polyY = array();//vertical coordinates of corners 

$zonal = "14.519780046326085,82.7490234375:8.276727101164045,88.9453125:3.7327083213358465,77.958984375:5.134714634014455,77.1240234375:7.493196470122287,76.552734375:10.18518740926906,75.498046875:11.781325296112277,75.05859375:13.539200668930814,80.2001953125:14.519780046326085,82.7490234375"; 

$zonalArray = explode(":",$zonal); 
$polySides = count($zonalArray); //how many corners the polygon has 
foreach($zonalArray as $eachZoneLatLongs) 
{ 
    $latlongArray = explode(",",$eachZoneLatLongs); 
    $polyX[] = $latlongArray[0]; 
    $polyY[] = $latlongArray[1]; 
} 




$vertices_x = $polyX; // x-coordinates of the vertices of the polygon 
$vertices_y = $polyY; // y-coordinates of the vertices of the polygon 
#$vertices_x = array(37.628134, 37.629867, 37.62324, 37.622424); // x-coordinates of the vertices of the polygon 
#$vertices_y = array(-77.458334,-77.449021,-77.445416,-77.457819); // y-coordinates of the vertices of the polygon 
$points_polygon = count($vertices_x); // number vertices 
#Following Points lie inside this region 
$longitude_x = 6.927079 ; // x-coordinate of the point to test 
$latitude_y = 79.861243; // y-coordinate of the point to test 

#Following Points lie outside this region 
#$longitude_x = 27.175015 ; // x-coordinate of the point to test 
#$latitude_y = 78.042155; // y-coordinate of the point to test 

if (is_in_polygon($points_polygon, $vertices_x, $vertices_y, $longitude_x, $latitude_y)){ 
    echo "Is in polygon!"; 
} 
else echo "Is not in polygon"; 


function is_in_polygon($points_polygon, $vertices_x, $vertices_y, $longitude_x, $latitude_y) 
{ 
    $i = $j = $c = 0; 
    for ($i = 0, $j = $points_polygon-1 ; $i < $points_polygon; $j = $i++) { 
    if ((($vertices_y[$i] > $latitude_y != ($vertices_y[$j] > $latitude_y)) && 
    ($longitude_x < ($vertices_x[$j] - $vertices_x[$i]) * ($latitude_y - $vertices_y[$i])/($vertices_y[$j] - $vertices_y[$i]) + $vertices_x[$i]))) 
     $c = !$c; 
    } 
    return $c; 
}