Abstract
Despite today's extensive remote sensing imagery with all kinds of sensors, the use of old aerial imagery is still importantin the study of slowly evolving land processes to reconstruct past landscape forms. Numerous organisations sharephotogrammetric data in public repositories, offering opportunities to exploit them to identify historical, natural andanthropogenic topographic changes, which is particularly interesting if they are difficult to access areas, possibly affectedsince historic times by climate change and other geodynamic processes. This work proposes and applies a workflow basedon the SfM-MVS photogrammetric technique to 22 and 33 historical aerial photographs of the English FIDASE (1956/57)and Argentinean Navy (1968) flights, scanned at 1016dpi and 96dpi, black and white, of Deception Island (South Shetland,Antarctica). The photogrammetric processing controls the threshold values of the reconstruction uncertainties andprojection accuracy. The 3D point clouds obtained are geroreferenced with 37 ground control points (GCP) geographicallypositioned in a QuickBird2 satellite image over island areas not affected by volcanism. The quality of the DTM is controlledby comparison with the 1960 topographic map 1:25000 of the island, which allows the volumes of material emitted in thevolcanic eruption of 1967 to be evaluated. The results obtained improve considerably and extend the set of resultscompared to those obtained by classical contour line digitizing. The applied method, the DTM and orthomosaic of 1956and 1968 presented will allow us to evaluate, together with the analysis applied to later historical flights, English 1979 andChilean 1986, the recent changes produced by the recent volcanism, the local external geodynamics, the possible climaticdeterioration and the scope of current human activity from 1956 to the present day.
Highlights
The Spanish Army Antarctic Base "Gabriel de Castilla" (BGdC) is located on Deception Island (South Shetland Islands, Antarctic Peninsula, Antarctica)
This paper proposes a standard procedure for SfM-MVS restitution of historical flights, with uncertainty control and georeferencing to terrain, as an alternative to classical stereo photogrammetric techniques when camera data or images are incomplete or missing, which is common in old imagery of remote places, to obtain a digital terrain elevation model (DTM) and an orthoimage
We selected for the Falkland Islands Dependencies Aerial Survey Expedition (FIDASE) flight 22 images of the second pass covering an area (Fig. 6a) of 263 km2, neglecting those of the first track (17/12/1956) because they had cloudy areas and an uncovered zone between Morro Baily and Punta SouthEast
Summary
The Spanish Army Antarctic Base "Gabriel de Castilla" (BGdC) is located on Deception Island (South Shetland Islands, Antarctic Peninsula, Antarctica). The fact that man has established a temporary settlement on the island and its interaction with the natural environment, the scene of multiple geo-hydrodynamic processes that pose a certain hazard, opens up the possibility of other problems of particular relevance. Deception Island is the most active volcano in the South Shetland Islands and has been the site of more than twenty identified eruptions in the last two centuries (Berrocoso et al 2012). Recent eruptions (1967, 1969, and 1970) have demonstrated that the island can become a significant potential hazard to tourists (over 30 000 visits in the austral summer), scientists, and military personnel on and around the island (Fig. 1). Each volcanic event has caused significant uplift or subsidence, ground displacement or infilling of deposits, and changes in the island's relief and coastline
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