检查特定半径的纬度？ [英] Check a lat long in particular radius?

问题描述

我们正在开发基于位置的应用程序。这里我们有一组lat，长在数据库中。现在我们需要收集特定区域的所有纬度。



例如。

表1

a-- > 10.20321,45.12364

b - > 10.20321,12.12345

c - > 10.20321,45.12378



从上面的细节我需要收集所有特定区域的人（在一个地方大约15公里）。



我尝试过：



我们正在使用谷歌地图获取一个人的经纬度，并将存储在数据库中。



任何人都可以帮忙整理出来吗？

We are developing location based application. here we are having set of lat,long in database. Now we need to collect all lat long in particular area.

Eg.
Table1
a-->10.20321,45.12364
b-->10.20321,12.12345
c-->10.20321,45.12378

From above details i need to collect persons who are all in particular area(around 15 Kms in a place).

What I have tried:

We are using google maps to get latitude and longitude of a person and wil be stored in DB.

Can anyone help to sort out?

推荐答案

计算地球上2个点之间的距离是一个经典问题，它的名字是Great Circle Distance。

大圆距离 - 维基百科，免费的百科全书 [ ^ ]



理查德的链接是值得的看起来也是。

Computing the distance between 2 points on earth is a classical problem, its name is Great Circle Distance.
Great-circle distance - Wikipedia, the free encyclopedia[^]

Richard's links are worth a look too.

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