Using aerial photography to study glacier changes in Norway

Abstract

The Norwegian Water Resources and Energy Administration has photographed glacial areas in Norway for several decades. Detailed maps or digital terrain models have been made for selected glaciers from vertical aerial photographs. Multiple models of seven glaciers have been used here to calculate glacier volume change during the time between mappings using the geodetic method. Analyses and results are presented and compared with traditional mass-balance measurements. We estimated uncertainties of ±1.3–2.7mw.e. for the geodetic method, and ±1.3 –3.5mw.e. for the traditional method. The discrepancies between the methods varied between 0.4 and 4.7 mw.e. All glaciers decreased in volume from the 1960s/70s to the 1990s, except Hardangerjøkulen. This glacier experienced a significant increase in volume: the geodetic and traditional methods showed net balance values of +6.8m and +9.4mw.e., respectively. Trollbergdalsbreen had the largest total volume loss: the geodetic and traditional methods showed net balance values of –12.3 and –16.8mw.e.

Landsat-derived glacier inventory for Jotunheimen, Norway, and deduced glacier changes since the 1930s

“…1). These maps are described in detail in Andreassen (1999), Andreassen et al (2002) and Haakensen (1986). Here, these data were used for comparison with the N50 data constructed by Statens Kartverk.…”

Combining Airborne Photographs and Spaceborne SAR Data to Monitor Temperate Glaciers: Potentials and Limits

“…Photogrammetry was regarded primarily as a source of DTMs rather than as a cartographic tool. The derived digital model proved its efficiency for glaciological analysis [9], [11].…”

Remote Sensing of Cryosphere

“…The TM4/TM5 ratio is more appropriate for clean-ice glacier mapping (Paul and Kaab, 2001), whereas TM3/TM5 works better in areas of dark shadow and thin debris cover (Andreassen et al, 2002). Both NDSI and ratio methods have similar robust outcomes in glacier mapping and are recommended.…”