In mid-April 2012 full coverage was obtained over the three main acquisition blocks of Angkor,Phnom Kulen and Koh Ker.The four months of planning culminated in various contractors from various countries converging in Siem Reap for seven days of flight operations in mid-April,with all work overseen by staff from the APSARA National Authority,the University of Sydney,and Civil Aviation authorities.The logistical support was provided by various teams.