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    Estimation of forest properties in a treeline zone using TanDEM-X and airborne laser scanning data (2018)
    Laboratoire EDYTEM - UMR5204 Université Savoie Mont Blanc
    In:  EPIC35th European Conference on Permafrost (EUCOP 2018), Chamonix, France, 2018-06-23-2018-07-01Le Bourget du Lac, France, Laboratoire EDYTEM - UMR5204 Université Savoie Mont Blanc
    Details
    Publication Date: 2018-09-24
    Description: The high-latitude forest-tundra transitional zone is a region which is highly vulnerable to the current Arctic warming. The local changes accompanying expected northward migration of the treeline requires systematic monitoring. We focus on an area in the east of the Mackenzie Delta in Northwest Territories, Canada, which is characterised by patches of black spruce forest. We investigate the capability of TerraSAR-X / TanDEM-X bistatic constellation for the characterisation of these forest patches. Interferometric phase and coherence from seven image pairs were used to estimate tree height and density. We compare the SAR products with standard vegetation metrics from airborne LiDAR, such as vegetation height percentiles and vegetation ratio. The preliminary analysis shows a high agreement between SAR and LiDAR data.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Conference , notRev
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  • 2
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    Sentinel-1 SAR Interferometry for Surface Deformation Monitoring in Low-Land Permafrost Areas (2018)
    MDPI AG
    In:  EPIC3Remote Sensing, MDPI AG, 10(9), pp. 1360, ISSN: 2072-4292
    Details
    Publication Date: 2021-08-16
    Description: Low-land permafrost areas are subject to intense freeze-thaw cycles and characterized by remarkable surface displacement. We used Sentinel-1 SAR interferometry (InSAR) in order to analyse the summer surface displacement over four spots in the Arctic and Antarctica since 2015. Choosing floodplain or outcrop areas as the reference for the InSAR relative deformation measurements, we found maximum subsidence of about 3 to 10 cm during the thawing season with generally high spatial variability. Sentinel-1 time-series of interferograms with 6–12 day time intervals highlight that subsidence is often occurring rather quickly within roughly one month in early summer. Intercomparison of summer subsidence from Sentinel-1 in 2017 with TerraSAR-X in 2013 over part of the Lena River Delta (Russia) shows a high spatial agreement between both SAR systems. A comparison with in-situ measurements for the summer of 2014 over the Lena River Delta indicates a pronounced downward movement of several centimetres in both cases but does not reveal a spatial correspondence between InSAR and local in-situ measurements. For the reconstruction of longer time-series of deformation, yearly Sentinel-1 interferograms from the end of the summer were considered. However, in order to infer an effective subsidence of the surface through melting of excess ice layers over multi-annual scales with Sentinel-1, a longer observation time period is necessary.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
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