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Raja has found a further ~48 perfSONAR landmarks mainly in Europe and N. America. We now have 228 active unique landmarks. He now checks for new landmarks on a monthly basis. We have also created Taiwan as another region for which we can get good location information. We now work for N. America, Europe, Pakistan and Taiwan. He also uses the options feature of traceroute.pl to reduce the time for the PingER/perfSONAR landmarks to make the pings by a factor of 5. Given this we probably need to review the timeouts.
Raja has made lots of measurements and created cumulative probability distribution functions of how the new TULIP with adapting alpha (in distance = Alpha*100(km/ms)*min_RTT(ms)) according to region and min_RTT compares to databases and Constraint Based Geolocation and Single Ping etc. He has also added information on the impact of landmark density on accuracy.
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