从纬度减去米 [英] Subtract meters from latitude

问题描述

通过从给定纬度减去SOUTH x米数来计算新纬度点的最简单方法是什么?例如，埃菲尔铁塔的纬度为 48.8582，经度为<2.2940 .我在塔周围绕了一圈，半径为171米.我想将InfoBox放置在圆圈的下方.

What is the simplest way to calculate a new latitude point by going SOUTH x number of meters from a given latitude? For example, the Eiffel Tower is at 48.8582 latitude and 2.2940 longitude. I have a circle around the Tower with a radius of 171 meters. I want to position an InfoBox just beneath the circle.

这是我的圈子:

var circle = new google.maps.Circle({
    map: map,
    fillColor: 'red',
    fillOpacity: 0.2,
    strokeWeight: 1,
    center: new google.maps.LatLng(48.8582, 2.2940),
    radius: 171
});

我的信息框当前位于圆上的死点位置，但我希望它直接位于圆的下面.所以我想我只需要将盒子(171/2 = 85.5)向南移动即可获得所需的位置.

My infobox currently gets positioned dead center on the circle, but I want it directly beneath the circle instead. So I'm guessing I just need to move the box (171/2=85.5) meters south to get the positioning I want.

对此有一个简单的计算方法吗?我看过 haversine公式，但这似乎比它复杂得多.我需要什么，我不知道如何使用它，甚至不适合这个问题.

Is there a simple calculation for this? I have looked at the haversine formula but that seems a lot more complex than what I need, and I don't understand how to use it, and whether it even suits this problem.

我想向南精确地走85.5米，并获得新的经纬度坐标来定位InfoBox.大概只有纬度会改变，但我不确定.

I want to go south exactly 85.5 meters and get new lat/long coords for positioning of the InfoBox. Presumably only latitude would change, but I'm uncertain.

推荐答案

向南85.5米非常容易，因为纬度始终以米为单位.地球的周长为±40075公里，相当于360度，因此您的答案是360 * 85.5/40075000 = 0.000768度.

85.5 meters south is very easy, because a degree latitude has always the same value in meters. The Earth has a circumference of ± 40075 km, which corresponds to 360 degrees, so your answer is 360 * 85.5 / 40075000 = 0.000768 degrees.

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