Beefy Boxes and Bandwidth Generously Provided by pair Networks
The stupid question is the question not asked

Comment on

( #3333=superdoc: print w/ replies, xml ) Need Help??
If your search radius is so small (25 miles), You could eliminate 90% of your data before you do a lot of the number crunching using a less-accurate estimate first -- perhaps a good choice would be to check if the latitude/longitude are within ~10 degrees (or some constant appropriate for your data) of the origin and skip the coordinates if they are not. Maybe just comparing the number of degrees is a bad choice, but I also know that there are several great circle distance calculation algorithms around, with varying trade-offs between speed and accuracy. The key is to eliminate bad matches first with the low-accuracy algorithm, then use the high-accuracy one on the close ones.

You may also wish to check out Geo::Distance or Geo::PostalCode to see how they do it. Geo::PostalCode claims to have a feature exactly as you describe.


In reply to Re: Zipcode Proximity script by blokhead
in thread Zipcode Proximity script by hacker

Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post; it's "PerlMonks-approved HTML":

  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.
  • Log In?

    What's my password?
    Create A New User
    and the web crawler heard nothing...

    How do I use this? | Other CB clients
    Other Users?
    Others lurking in the Monastery: (3)
    As of 2015-11-29 01:19 GMT
    Find Nodes?
      Voting Booth?

      What would be the most significant thing to happen if a rope (or wire) tied the Earth and the Moon together?

      Results (746 votes), past polls