I think it's really three dimensional, but unless someone is climbing something steep two dimensional would be OK. But a rock climber would be going very slowly up a cliff and the lat and long would stay the same and the elevation would change with time, so for this and other vertical (climbing a pole or tower), the problem should probably be done as three dimensional.

Get your head around that ;)



                 _--=0            Hermosa Beach, California USA

           __  /---\\           http://KeepTheRubberSideDown.com

          ___ ()    ()       email: http://public.xdi.org/=mtnbiker

                                 Skype: KnobbyGeek 

On Jan 26, 2006, at 1:05 PM, Beverly Howard wrote:

>> This would be a good little project for some coder. <<

While I am relatively new to any geo-coding, since the problem is two dimensional, I can't wrap my head around determining the closest point other than to compute the distance between one point and all other points then choosing the lowest value.

Any elucidation on alternatives would be appreciated.

Beverly Howard