Using repeat airborne LIDAR to assess surface elevation to assess spatial variation in changes of mainland Norway from ~2010 to ~2020
Abstract ID: 3.10947 | Not reviewed | Requested as: Talk | TBA | TBA
Liss Marie Andreassen (1)
Hallgeir, Elvehøy (1); Bjarne, Kjøllmoen (1); Kamilla Haukland, Sjursen (2)
(1) Section for Glaciers, Ice and Snow, Norwegian Water Resources and Energy Directorate, Middelthunsgate 29, 0368 Oslo, PK
(2) Western Norway University of Applied Sciences, Sogndal, Norway
Abstract
In this study we use repeat high resolution airborne LiDAR and orthophotos to study changes in glacier area and surface elevation for the period ~2010 to ~2020. The earliest survey year is 2007 and the latest survey year is 2022. The mean (median) number of years surveyed is 9.5 (10) years. Our study area covers over a third of the glacier area in Norway and three of the GTN-G glacier sub-regions 08-01, -02 and -03. We derive glacier outlines from the time of survey using high resolution orthophotos. In cases where orthophotos are lacking or snow conditions are severe, we use satellite data or LiDAR data to derive glacier outlines. We demonstrate the importance of using updated glacier outlines due to retreat of glaciers compared to the RGI inventory. Elevation change results are in most cases more negative when using updated glacier masks corresponding to the period of comparison. We compare our surface elevation changes using repeat LiDAR with global studies using repeat ASTER.
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