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First image shows the worlds cities with a population of more than 1000, data from <a href="http://geonames.org" rel="nofollow, noopener, noreferrer" target="_blank">geonames.org</a>. Cities with more than 5 million inhabitants are labeled.</p> <img src="/images/2008-07-02-geosketches-0001.jpg" alt="World Cities"> <p>Second image visualizes conversations of about 1500 users from microblogging service <a href="http://twitter.com" rel="nofollow, noopener, noreferrer" target="_blank">Twitter</a>. The arcs link positions of people who talk to each other.</p> <img src="/images/2008-07-02-geosketches-0002.jpg" alt="Twitter Conversations"> <p>Done with the wonderful <a href="http://processing.org" rel="nofollow, noopener, noreferrer" target="_blank">processing.org</a> during my time at <a href="http://www.modul.ac.at/nmt" rel="nofollow, noopener, noreferrer" target="_blank">MODUL University Vienna</a>.</p> <p><a href="http://www.rafelsberger.at" rel="nofollow, noopener, noreferrer" target="_blank">Let me know if you’re interested in working with me.</a></p> <p><strong>Update:</strong> BusinessWeek posted the Twitter Visualization and thinks I’m one of <a href="http://images.businessweek.com/ss/09/08/0812_data_visualization_heroes/10.htm" rel="nofollow, noopener, noreferrer" target="_blank">21 heroes of Data Visualization</a> :-).</p> </div> </article> </div> <button aria-label="Back to Top" class="z-90 fixed bottom-8 end-4 flex h-10 w-10 translate-y-28 items-center justify-center rounded-full border-2 border-transparent bg-zinc-200 text-3xl opacity-0 transition-all duration-300 hover:border-zinc-400 data-[show=true]:translate-y-0 data-[show=true]:opacity-100 dark:bg-zinc-700 sm:end-8 sm:h-12 sm:w-12" data-show="false" id="to-top-btn"><svg aria-hidden="true" class="h-6 w-6" fill="none" focusable="false" stroke="currentColor" stroke-width="2" viewBox="0 0 24 24" xmlns="http://www.w3.org/2000/svg"> <path d="M4.5 15.75l7.5-7.5 7.5 7.5" stroke-linecap="round" stroke-linejoin="round"></path> </svg> </button> </main> <footer class="mt-auto flex w-full flex-col items-center justify-center gap-y-2 pb-4 pt-20 text-center align-top font-semibold text-gray-600 dark:text-gray-400 sm:flex-row sm:justify-between sm:text-xs"> <div class="me-0 sm:me-4"> © walterra 1978-2025. </div> <nav aria-label="More on this site" class="flex gap-x-2 sm:gap-x-0 sm:divide-x sm:divide-gray-500"> <a class="px-4 py-2 sm:py-0 sm:hover:text-textColor sm:hover:underline" href="/blog/"> blog </a> </nav> </footer> </body></html>