Awesome work - for the shortest path calculation are you using an A*, Bellman-Ford type approach, or something else? We tried a bunch of optimizations to a Floyd style all-to-all SP problem back in the day. Tricky computations and always cool to see new approaches. Not to mention a brilliant visualization of it all.<div>
<br></div><div>thanks,</div><div>sean<br><br><div class="gmail_quote">On Mon, Mar 12, 2012 at 12:49 PM, Brandon Martin-Anderson <span dir="ltr"><<a href="mailto:badhill@gmail.com">badhill@gmail.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Not directly. Stochastic optimizing processes, or optimizing processes<br>
over stochastic data sets, tend to end up looking biological, because<br>
biological systems are stochastic optimizing processes.<br>
<span class="HOEnZb"><font color="#888888"><br>
-B<br>
</font></span><div class="HOEnZb"><div class="h5"><br>
On Mon, Mar 12, 2012 at 12:42 PM, Laurence Penney <<a href="mailto:lorp@lorp.org">lorp@lorp.org</a>> wrote:<br>
> Utterly beautiful.<br>
><br>
> Is it inspired by Günther von Hagens’s work with blood vessels?<br>
><br>
> <a href="http://weheartit.com/entry/19937599" target="_blank">http://weheartit.com/entry/19937599</a><br>
> <a href="http://plastynarium.pl/images/2011/10/krwiobieg.jpg" target="_blank">http://plastynarium.pl/images/2011/10/krwiobieg.jpg</a><br>
> <a href="http://3.bp.blogspot.com/_DaOtlZ8Ux7s/TFmhpAJziMI/AAAAAAAAADE/PFP15vpUZlU/s1600/bodies-revealed-blood-vessels.jpg" target="_blank">http://3.bp.blogspot.com/_DaOtlZ8Ux7s/TFmhpAJziMI/AAAAAAAAADE/PFP15vpUZlU/s1600/bodies-revealed-blood-vessels.jpg</a><br>
> <a href="http://www.bodyworlds.com/en/media/picture_database/preview.html?id=4" target="_blank">http://www.bodyworlds.com/en/media/picture_database/preview.html?id=4</a><br>
> <a href="http://thedispersalofdarwin.files.wordpress.com/2011/11/img_0690.jpg" target="_blank">http://thedispersalofdarwin.files.wordpress.com/2011/11/img_0690.jpg</a><br>
><br>
> - Laurence<br>
><br>
> On 12 Mar 2012, at 16:11, Brandon Martin-Anderson wrote:<br>
><br>
>> Behold! I made a thing.<br>
>><br>
>> <a href="http://shortestpathtree.org" target="_blank">http://shortestpathtree.org</a><br>
>><br>
>> It creates shortest path trees, which are pretty, and have a variety<br>
>> of uses. My favorite use is quickly and phenomenologically checking<br>
>> OSM referential integrity across entire cities. Also, potentially, it<br>
>> can tell you how to get places. Tell me how you like it.<br>
>><br>
>> Colophon, for the interested:<br>
>> Server and client-side code is at <a href="https://github.com/bmander/vtp" target="_blank">https://github.com/bmander/vtp</a>. I<br>
>> took Migurski's city extracts in PBF format and popped them into a<br>
>> Mongodb instance using a homebrew script in node.js. Then I applied a<br>
>> series of map-reduce runs to slice the ways at shared intersections,<br>
>> and to collect them into tiles. This is slow, but there's some home of<br>
>> parallelization. A simple node.js script serves the vector tiles to<br>
>> the client, where all routing is done; printed to a homebrew<br>
>> canvas-based client. The disadvantage is that routing is slow for you.<br>
>> The advantage is the server doesn't have to do anything except hand<br>
>> out tiles, which, ideally, should be pretty small.<br>
>><br>
>> -B<br>
>><br>
>> _______________________________________________<br>
>> dev mailing list<br>
>> <a href="mailto:dev@openstreetmap.org">dev@openstreetmap.org</a><br>
>> <a href="http://lists.openstreetmap.org/listinfo/dev" target="_blank">http://lists.openstreetmap.org/listinfo/dev</a><br>
><br>
<br>
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</div></div></blockquote></div><br><br clear="all"><div><br></div>-- <br>Sean Gorman PhD.<div>GeoIQ</div><div>2200 Wilson Blvd. Suite 307</div><div>Arlington VA, 22201</div><div>mobile: 202-321-3914</div><div>office: 703-647-2151</div>
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