What I need is to take the address from the first .csv and match it to the GPS co-ordinates in the second .csv file.
...
Being GPS co-ordinates there is some margin of difference -/+10

So you want to merge (JOIN) two data sets, keyed on integer data within a range. That sounds very much like a job for a database. I would expect any decent RDBMS to handle this task with ease (and most will have a load-from-CSV option saving you effort there too). Is there anything you aren't telling us which would preclude solving this in the database and then using Perl to process the results?

In reply to Re: CSV Cross Referencing by hippo
in thread CSV Cross Referencing by Jalcock501

Title:
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, details, 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, summary, 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.