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POMerging multiple encoded polylines into one encoded polyline
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  1. POMerging multiple encoded polylines into one encoded polyline
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    copied!<p>I'm trying to merge a new encoded polyline with an existing polyline without decoding and reencoding the whole polyline. The new encoded polyline will be uploaded to a (linux) server where I would like to append it to the existing polyline.</p> <p>The problem is, you can't just mash them together. Below is some sample data to play with. My hope is to find/create a solution in either PHP or a shell script but the problem is, I have no where near enough technical understanding to interpret the encoded polyline algorithm. </p> <pre><code>41.386692,-73.475912 41.424822,-73.375027 41.428292,-73.311173 41.426183,-73.254577 41.470168,-73.218532 41.498865,-73.155278 (Yes, 6 points are easy, but it's going to be more like 7,000 coordinate pairs) </code></pre> <ul> <li>First 3 Coordinate Pairs Encoded: <code>yir{Fnwm_MimFquRuTanK</code></li> <li>Last 3: <code>s`z{Fbpb~L{qGg`FkrDkjK</code></li> <li>All 6: <code>yir{Fnwm_MimFquRuTanKdLw`J{qGg`FkrDkjK</code></li> </ul> <p><a href="http://code.google.com/apis/maps/documentation/utilities/polylineutility.html" rel="nofollow">Interactive Polyline Encoder Utility</a><br/> Encoded Polyline Algorithm Format (you can get to this via Interactive Encoder)<br/> <a href="http://facstaff.unca.edu/mcmcclur/GoogleMaps/EncodePolyline/" rel="nofollow">Polyline Encoder</a><br/></p> <h1>Edit:</h1> <p>I also have the original data that encoded the polylines on both ends. So I can also save the first and last coordinate pair separately.</p> <h1>Helpful Reads:</h1> <p>I ended up writing a blog post that has a lot more detail about how encoded polylines work. You can read it here: <a href="http://www.danmandle.com/blog/what-is-an-encoded-polyline/" rel="nofollow">What is an Encoded Polyline?</a></p>
 

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