Deception volcano's 1967-1970 eruption from visible band imagery (Antarctic Peninsula)

Resumen

Aerial photography and satellite images are widely recognized as asource of data for theproduction of maps of large areas ofextension. The use of appropriate photogrammetric techniques can provide representative volcano-surfacemaps andthrough them thequantification of mass movement, extruded material volume and eruption caused destruction. Stereo-photogrammetry isa recognizedmapping tool applied for almost one century, where from several overlappingimages of the earth surface both 3D modelsandorthographicmosaicsareobtained. Contrastingwith classical stereo-photogrammetry,structure-from-motion andmultiview-stereo is a nearly automated compilation of strategies that involve the identification of features inindividual images, themeasurement of its coordinates in the camera reference systemandthe estimation ofcamera andfeaturespositions in a nonscaled arbitrary coordinate system.Only with ground control points or known positions of thecamera centers in an appropriate earth referencesystem the three-dimensionalsurface reconstruction is obtained based onmassivegeometric data over adense point cloud and corresponding surface mesh. The camera positions and surface reconstruction are then required to correct for the radial displacement of each pixel in the images that form the orthographic mosaic. Therefore, the complete imagery processing can be made withmanual interaction almostlimited to theground control points’identification. Today’scapability to measure volcano surface changes previous to satellite based remote sensing and global navigation satellite systems geodetic measurementsarepossiblebyre-analyzingavailable photogrammetric frames. Deception volcano high-resolution imagery (frames and satellite images - visible band) where re-analyzed bystructure-from-motion andmulti-view-stereo photogrammetry and digital image processing to produce orthographic mosaics and digital elevation models thathelp to re-evaluate Deception’svolcaniceruptions from 1967-1970.