A key feature of the expedition was its use of helicopter-mounted Lidar technology to scan the Phnom Kulen area and then map the city layout.
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It is derived from the Sanskrit words महेन्द्र (Great Indra, a title of the Hindu god Indra) and पर्वत (mountain) and is a reference to the sacred hill top site commonly known as "Phnom Kulen" today where Jayavarman II was consecrated as the first king of the Khmer Empire in 802.
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His reign was consecrated on the sacred mountain of Mahendraparvata, known as Phnom Kulen in contemporary Cambodian.
Jayavarman II is widely regarded as the king that set the foundation of the Angkor period in Cambodian history, beginning with the grandiose consecration ritual conducted by Jayavarman II (reign 790-850) in 802 on sacred Mount Mahendraparvata, now known as Phnom Kulen, to celebrate the independence of Kambuja from Javanese dominion.