English: Time series of maritime traffic crossing the Indian Ocean showing the effect of piracy and its progressive decline in re-routing ships. Each sub-plot shows 6-month colour-coded trips, red southbound and green northbound, using Long Range Identification and Tracking (LRIT) historical data. Operational authorities requested an increase of LRIT reporting frequency from ships in 2009 and 2010 in order to better track them remotely in the High Risk Area. The increase of tracking points can be erroneously perceived as an apparently higher volume of traffic with respect to other periods.
Published in Vespe M., Greidanus H., Alvarez M., 'The declining impact of piracy on maritime transport in the Indian Ocean: Statistical analysis of 5-year vessel tracking data'. Marine Policy. 59: 9–15. DOI:10.1016/j.marpol.2015.04.018. [1]
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