DEM Generation over Ice Fields in Nunavut with Along-track SPOT5 HRS Stereo Data

• Published in: Canadian Journal of Remote Sensing
• Main Authors: Toutin, T., Schmitt, C., Berthier, Etienne, Clavet, D.
• Other Authors: Canada Centre for Remote Sensing (CCRS), Natural Resources Canada (NRCan), GLACIO LEGOS, Laboratoire d'études en Géophysique et océanographie spatiales (LEGOS), Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire Midi-Pyrénées (OMP), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales Toulouse (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France-Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales Toulouse (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales Toulouse (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France-Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales Toulouse (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France-Centre National de la Recherche Scientifique (CNRS)
• Format: Article in Journal/Newspaper
• Language: English
• Published: HAL CCSD 2011
• Subjects: [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography; Nunavut; ice covered areas
• Online Access: https://hal.science/hal-00742675; https://doi.org/10.5589/m11-052

International audience A digital elevation model (DEM) was generated using a SPOT5 HRS stereo pair acquired over a challenging ice field and fjord study site in Nunavut (80% of the area was ice covered and almost 50% of the area had 40 degrees slopes). The DEM was thus evaluated by comparison with a topographic 1959 DEM and ICESat data, over and outside the ice fields and as a function of slope. The DEM generation did not need any reference cartographic data for collecting ground control points. The method could be applied to ice-covered areas with a 15 m accuracy (1 sigma) over less than 5 degrees slopes or a 22 m accuracy (1 sigma) over less than 40 degrees slopes. In addition, a systematic elevation lowering of 8-10 m computed between 1959 DEM and recent elevation data (HRS and ICESat) could be due to ice field wastage over the last 50 years