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Beginning ~3,500 to 3,300 y B.P., humans voyaged into Remote Oceania. Radiocarbon-dated archaeological evidence coupled with cultural, linguistic, and genetic traits indicates two primary migration routes: a Southern Hemisphere and a Northern Hemisphere route. These routes are separated by low-lying, equatorial atolls that were settled during secondary migrations ~1,000 y later after their exposure by relative sea-level fall from a mid-Holocene highstand. High volcanic islands in the Federated States of Micronesia (Pohnpei and Kosrae) also lie between the migration routes and settlement is thought to have occurred during the secondary migrations despite having been above sea level during the initial settlement of Remote Oceania. We reconstruct relative sea level on Pohnpei and Kosrae using radiocarbon-dated mangrove sediment and show that, rather than falling, there was a ~4.3-m rise over the past ~5,700 y. This rise, likely driven by subsidence, implies that evidence for early settlement could lie undiscovered below present sea level. The potential for earlier settlement invites reinterpretation of migration pathways into Remote Oceania and monument building. The UNESCO World Heritage sites of Nan Madol (Pohnpei) and Leluh (Kosrae) were constructed when relative sea level was ~0.94 m (~770 to 750 y B.P.) and ~0.77 m (~640 to 560 y B.P.) lower than present, respectively. Therefore, it is unlikely that they were originally constructed as islets separated by canals filled with ocean water, which is their prevailing interpretation. Due to subsidence, we propose that these islands and monuments are more vulnerable to future relative sea-level rise than previously identified. 

Mientras que la tecnología lidar se convierte en una práctica regular en la prospección arqueológica, tanto sus aplicaciones terrestres como las aéreas pueden ser complementadas con tecnología lidar integrada en drones o en inglés “unpiloted aerial vehicle” (UAV). En este artículo, presentamos un método para potenciar la data lidar adquirida por tecnología UAV con data obtenida utilizando diferentes plataformas lidar (terrestres y aéreas), a una variedad de rangos de resolución (desde 1 a + 1,000 puntos por metro cuadrado) y a diversas escalas geográficas. Utilizamos estos instrumentos para documentar un muro de mampostería en seco que rodea un precinto religioso al interior del centro real en Kealakekua, distrito de Kona, en la isla de Hawai'i. Previo al contacto europeo alrededor de dC 1779, Kealakekua era el centro político de la isla durante el festival anual de Makahiki. Los resultados de este estudio sugieren que cuando el muro fue construido, aproximadamente en dC 1640, esta fue la estructura de mayores dimensiones jamás construida en la isla de Hawai'i y una fuerte expresión material del poder religioso estatal y los rituales de Makahiki.