确定纬度/经度 [英] Determine if Lat/Lng in Bounds

问题描述

我对确定经/纬度位置是否在范围内以及寻找有关算法的建议感兴趣. (javascript或php)

I'm interested in determining if a lat/lng location is within the bounds and looking for recommendations on a algorithm. (javascript or php)

这是我到目前为止所拥有的:

Here is what I have so far:

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

推荐答案

帖子中的简单比较适用于美国的坐标.但是，如果您想要一种可以安全检查国际日期范围(经度为±180°)的解决方案:

The simple comparison in your post will work for coordinates in the US. However, if you want a solution that's safe for checking across the International Date Line (where longitude is ±180°):

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;
}

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