[Rails] Re: Geocode for Ruby

[Adam Denenberg]

in my database i have zipcode, longitude, latitude, city name, state.  I
understand pretty much whats involved in calculating distance, but there are
a lot of factors involved in that formula so i was hoping that a library
already existed to do such things.  i have read thru Geocode::Postal in the
perl module and its pretty involved.

adam

On 12/14/05, Hasan Diwan <hasan.diwan at gmail.com> wrote:
>
> Adam:
> On Dec 14, 2005, at 7:38 AM, Dave wrote:
>
> > Adam Denenberg wrote:
> >>  Does anybody know of a good Geocode library for Ruby, similar to
> >> Perl's
> >> Geocode::Postal, that i could use in my rail app? I need to do some
> >> "within
> >> 5 miles" calculations of zipcodes and i dont have a nice ruby (or
> >> gem)
> >> utility to do it.
>
> It doesn't read like you're doing strict geocoding here. To solve the
> "within 5 miles" of zipcode problem, you need are the coordinates
> extremities of said zipcode. Since latitude and longitude correspond
> to distance, you then need to obtain how many degrees correspond to
> your desired distance. You then merely need to check if the given
> address's coordinates fall into this range.
> Cheers,
> Hasan Diwan <hasan.diwan at gmail.com>
>
>
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