Take a look at this: http://en.wikipedia.org/wiki/Great-circle_distance
On Tuesday, August 28, 2012 11:15:51 AM UTC-5, William Moss wrote: > > Hi guys > > Just a question....... I need some advice > > I am looking to put together a RoR app to interface with an iPhone app > > The iPhone app will be like a 'find the nearest' app. When the user runs > it, it will take the user's location, send a JSON request to the RoR app > running on a remote server with the location in the querystring > > The RoR app should then send back a list of locations for a particular > location for the iPhone app to display on the map. > > Is there any good gems that might help with this? I already have the > locations stored in the database along with and address, and can convert > the address into lat/long using geocoding. > > The part I am stuck about is an algorithm to search the database for the > 'nearest' locations given a particular lat/long. > > Thanks > William > > > -- You received this message because you are subscribed to the Google Groups "Ruby on Rails: Talk" group. To post to this group, send email to rubyonrails-talk@googlegroups.com. To unsubscribe from this group, send email to rubyonrails-talk+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msg/rubyonrails-talk/-/2E8C1U5MvjsJ. For more options, visit https://groups.google.com/groups/opt_out.
