将k m转换为gps坐标 [英] transform k m into gps Coordinates

问题描述

我必须看看GPS坐标是否在我创建的一个圆圈内。当我说我正在创建该圆圈时，我指的是这个：我有lat1，long1，
我的实际位置，我想测试这个位置是否有任何数据，但是
不远，然后是1km。我试图用圆不等式：（x2-a2）2+（y2-b2）2 其中a = lat1，b = long1，R =半径。我知道R = 1km，但是如何将1km转换为可以与GPS坐标进行比较的数据？而x，y是来自集合的每个值，它们都是testet以查看它们是否合适。

解决方案

Lat / Lng坐标不适用于Phytagoras公式，因为地球是一个球体，而不是平坦的...

查看本手册：

http://www.movable-type.co.uk/scripts/latlong.html

你需要距离方程，来看看你的经纬度和圆心的纬度/经度之间的距离是否小于R。

I have to see if some GPS coordinates are in a circle that I create.when I say I am creating that circle I' refering to this: I have lat1, long1, my actual location and I want to test if there is any data surrounding this location but not far then 1km. I am trying to use circle inequation : (x2-a2)2+(y2-b2)2 <R2 where a=lat1, b=long1 and R=radius. I know that R=1km but how do I transform 1km into data that can be compared to GPS coordinates? and x, y are every value from a collection that are testet to see if they fit.

解决方案

Lat/Lng coordinates don't work with the Phytagoras Formula, as Earth is a sphere, and not flat...

Take a look at this manual:

http://www.movable-type.co.uk/scripts/latlong.html

You need the distance equation, to see if the distance between the lat/lng you have and the lat/lng of the center of the circle is smaller than R.

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