Re: Geographic math problem

> Not being very strong at math, I have a little problem that I'm not sure how
> to solve. Maybe someone can help me.
>
> Basically, given a point (latitude, longitude) and a radius (100 meters)
> (think circle), I need to compute an equivalent square: That is, two points
> that would correspond to two corners of the square.
>
> From: 51, -114 100 meters
> To: 51.005, -114.005 NE corner
> 49.995, -113.995 SW corner
>
> Now, the above is not really accurate, of course, since the earth is
> spherical (well, at least most people think so), and I would like this
> computation to run in MySQL query, e.g.:
>
> UPDATE places SET ne_latitude = (*), ne_longitude = (*), sw_latitude = (*),
> sw_longitude = (*)
>
> In the above table, there are already three columns with the centre latitude
> and longitude and radius. Any ideas? Thanks.

http://www.mathforum.com/library/drmath/view/51711.html

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