Early Historical gold trade networks in Northwestern Luzon, as reconstructed from ethnohistorical accounts, WorldView2 satellite remote sensing and GIS predictive modelling: The Gasweling case

The paper shows the utility of high resolution multispectral WorldView2 (WV2) satellite imagery in remote sensing archaeological features associated to the gold evanescent market encounter within the Gasweling network in Northwester Luzon. Image enhancement of the features was done through the Brovey transform (Panchal and Thakker, 2015) pan-sharpening technique and data fusion (Kvamme, 2006) of WorldView2 indices. These features include Ijang/Ili or hill fort defenses as well as trail segments. In delineating the area with potential archaeological features, a close reading of conquistador accounts of Juan de Salcedo in 1572 and Alonso Quirante in 1624 was performed. Also geographic information systems (GIS) least coast path predictive modelling as well as visibility analysis was implemented in order to model the evanescent market (Allegre, 1998) encounter that took place at the coastal settlements.