确定纬度/经度是否在范围内

Question

我有兴趣确定纬度/经度位置是否在范围内并寻找算法建议。 （javascript 或 php）

这是我到目前为止所拥有的：

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
}

这行得通吗？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地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

当您询问 Javascript 和 PHP 时（我需要 PHP），我将 CheeseWarlock 的精彩答案转换为 PHP。与通常的 PHP 一样，这不太优雅。 :)

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;
}

Answer 3

这是 CheeseWarlock 的 Js 答案的稍微优化版本，即短路。

const inBounds = (point, bounds) => {
    const inLat = point.lat > bounds.sw.lat && point.lat < bounds.ne.lat
    if (!inLat) return false

    const eastBound = point.lng < bounds.ne.lng
    const westBound = point.lng > bounds.sw.lng
    return (bounds.ne.lng < bounds.sw.lng)
        ? eastBound || westBound
        : eastBound && westBound
}

Answer 4

这是我的代码，我针对 mysql 修改了它 它的 mysql 函数现在我们可以直接通过 sql 查询检查我们的长纬度是否在范围内。

特别感谢CheeseWarlock和Chris Rae提供的解决方案，谢谢先生

select inBounds("58.25173","-100.21041","89.71691425364952","180","-88.9294031317244","-180")

你可以像这样在查询中调用这个函数

DELIMITER $$
CREATE FUNCTION inBounds(pointLat FLOAT, pointLong FLOAT, boundsNElat FLOAT, boundsNElong FLOAT, boundsSWlat FLOAT, boundsSWlong FLOAT) RETURNS VARCHAR(30)
 BEGIN
  DECLARE westBound FLOAT ;
  DECLARE eastBound FLOAT ;
  DECLARE inLong FLOAT DEFAULT 0 ;
  DECLARE inLat FLOAT DEFAULT 0 ;
  IF (pointLong < boundsNElong) THEN 
    SET eastBound = 1;
  End if;
  IF (pointLong > boundsSWlong) THEN
    SET westBound = 1;
  End if;

  IF (boundsNElong < boundsSWlong) THEN
      IF (eastBound || westBound) THEN
         SET inLong = 1;
     END if;
  ELSE 
     IF (eastBound && westBound) THEN 
         SET inLong = 1;
     END IF;
  END IF;
  IF (pointLat > boundsSWlat && pointLat < boundsNElat) THEN
    SET inLat = 1;
  END IF;
  RETURN inLat && inLong;
END$$
DELIMITER ;

Answer 5

我尝试过以下方法对我有用。

    bool inBounds(LatLng point, LatLngBounds bounds) {
    var x1 = math.min(bounds.southwest.latitude, bounds.northeast.latitude);
    var x2 = math.max(bounds.southwest.latitude, bounds.northeast.latitude);
    var y1 = math.min(bounds.southwest.longitude, bounds.northeast.longitude);
    var y2 = math.max(bounds.southwest.longitude, bounds.northeast.longitude);
    return (x1 < point.latitude &&
        x2 > point.latitude &&
        y1 < point.longitude &&
        y2 > point.longitude);
  }

Answer 6

基于 CheeseWarlock 的解决方案，但适用于 Flutter 3：

  pointLatLngIsinBounds(LatLng point, LatLngBounds bounds) {

    var eastBound = point.longitude <    bounds.northEast.longitude;
    var westBound = point.longitude > bounds.southWest.longitude;
    var inLong;

    if (bounds.northEast.longitude < bounds.southWest.longitude) {
      inLong = eastBound || westBound;
    } else {
      inLong = eastBound && westBound;
    }

    var inLat = point.latitude > bounds.southWest.latitude && point.latitude < bounds.northEast.latitude;
    return inLat && inLong;
  }