确定Bounds中的Lat/Lng

Question

我对确定lat/lng位置是否在边界内并寻找算法建议感兴趣.(javascript或php)

这是我到目前为止:

var lat = somelat;
var lng = somelng;

if (bounds.southWest.lat < lat && lat < bounds.northEast.lat && bounds.southWest.lng < lng && lng < bounds.northEast.lng) {
     'lat and lng in bounds
}

这会有用吗？谢谢

Answer 1

您帖子中的简单比较适用于美国的坐标.但是,如果您想要一个可以安全检查国际日期变更线(经度为±180°)的解决方案:

function inBounds(point, bounds) {
    var eastBound = point.long < bounds.NE.long;
    var westBound = point.long > bounds.SW.long;
    var inLong;

    if (bounds.NE.long < bounds.SW.long) {
        inLong = eastBound || westBound;
    } else {
        inLong = eastBound && westBound;
    }

    var inLat = point.lat > bounds.SW.lat && point.lat < bounds.NE.lat;
    return inLat && inLong;
}

Answer 2

当你问起Javascript和PHP(我在PHP中需要它)时,我将CheeseWarlock的优秀答案转换为PHP.像往常一样,PHP不那么优雅.:)

function inBounds($pointLat, $pointLong, $boundsNElat, $boundsNElong, $boundsSWlat, $boundsSWlong) {
    $eastBound = $pointLong < $boundsNElong;
    $westBound = $pointLong > $boundsSWlong;

    if ($boundsNElong < $boundsSWlong) {
        $inLong = $eastBound || $westBound;
    } else {
        $inLong = $eastBound && $westBound;
    }

    $inLat = $pointLat > $boundsSWlat && $pointLat < $boundsNElat;
    return $inLat && $inLong;
}