Making the invisible visible: using UAS-based high-resolution color-infrared imagery to identify buried medieval monastery walls
JOURNAL OF UNMANNED VEHICLE SYSTEMS(2015)
Abstract
Remote sensing techniques have become an increasingly important tool for surveying archaeological sites. However, budgeting issues in archaeological research often limit the application of satellite or airborne imagery. Unmanned aerial systems (UAS) provide a flexible, quick, and more economical alternative to commonly used remote sensing techniques. In this study, the buried features of the archaeological site of the Kleinburlo monastery, near Munster, Germany, were identified using high-resolution color-infrared (CIR) images collected from a UAS platform. Based on these CIR images, a modified normalised difference vegetation index (NDVIblue) was calculated, showing reflectance spectra of vegetation anomalies caused by water stress. In the presented study, the vegetation growing on top of the buried walls was better nourished than the surrounding plants because very wet conditions over the days previous to data collection caused higher levels of water stress in the surrounding water-drenched land. This difference in water stress was a good indicator for detecting archaeological remains.
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Key words
archaeology,drone,NDVI,near infrared,unmanned aerial vehicle,vegetation anomalies
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