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    Reconstruction of former glacier surface topography from archive oblique aerial images

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    Authors
    Midgley, Nicholas G.
    Tonkin, Toby N. cc
    Affiliation
    Nottingham Trent University
    University of Derby
    Issue Date
    2017-01-06
    
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    Abstract
    Archive oblique aerial imagery offers the potential to reconstruct the former geometry of valley glaciers and other landscape surfaces. Whilst the use of Structure-from-Motion (SfM) photogrammetry with multiview stereopsis (MVS) to process small-format imagery is now well established in the geosciences, the potential of the technique for extracting topographic data from archive oblique aerial imagery is unclear. Here, SfM-MVS is used to reconstruct the former topography of two high-Arctic glaciers (Midtre and Austre Lovénbreen, Svalbard, Norway) using three archive oblique aerial images obtained by the Norwegian Polar Institute in 1936. The 1936 point cloud was produced using seven LiDAR-derived ground control points located on stable surfaces in proximity to the former piedmont glacier termini. To assess accuracy, the 1936 data set was compared to a LiDAR data set using the M3C2 algorithm to calculate cloud-to-cloud differences. For stable areas (such as nonglacial surfaces), vertical differences were detected between the two point clouds (RMS M3C2 vertical difference of 8.5 m), with the outwash zones adjacent to the assessed glacier termini showing less extensive vertical discrepancies (94% of M3C2 vertical differences between ± 5 m). This research highlights that historical glacier surface topography can be extracted from archive oblique aerial imagery, but accuracy is limited by issues including the lack of camera calibration, the quality and resolution of the archive imagery, and by the identification of suitable ground control. To demonstrate the value of historical glacier surfaces produced using oblique archive imagery, the reconstructed glacier surface topography is used to investigate evidence of a potential former surge front at the high-Arctic valley glacier, Austre Lovénbreen — a glacier identified to have potentially exhibited surge-type behaviour during the Neoglacial. A surface bulge of ~ 15–20 m is resolved on the 1936 model; however, when compared with the now deglaciated former subglacial topography, a surge origin for the surface feature becomes unclear. The processed 1936 oblique imagery was also used to produce orthorectified nadir aerial imagery, from which structural mapping was undertaken: this adds to the existing 1948–1995 structural map series for these glaciers. This research demonstrates the potential of SfM-MVS for reconstructing historical glacier surfaces, which is important for aiding our understanding of former glacier dynamics and enabling the rapid assessment of glacier change over time.
    Citation
    Midgley, N. G. and Tonkin, T. N (2017) 'Reconstruction of former glacier surface topography from archive oblique aerial images', Geomorphology, 282:18
    Publisher
    Elsevier
    Journal
    Geomorphology
    URI
    http://hdl.handle.net/10545/621282
    DOI
    10.1016/j.geomorph.2017.01.008
    Additional Links
    http://linkinghub.elsevier.com/retrieve/pii/S0169555X16306626
    Type
    Article
    Language
    en
    ISSN
    0169555X
    ae974a485f413a2113503eed53cd6c53
    10.1016/j.geomorph.2017.01.008
    Scopus Count
    Collections
    Environmental Sustainability Research Centre

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