1 Background - mountain.PROJECTS

PETRI PELLIKKA AND KARI KAJUUTTI (ED)Figure. 35. Fragments from the animation of glacier changes in the Hintereisferner test site 1894 –1997 retrieved from historical maps.The animation of glacier changes occurred in the Hintereisferner test site in 1894 –1997 isrepresented in the form of a PowerPoint presentation (Figure 35). The presentation includesthe sequence of 6 co-registered digital elevation models that were generated from Austriantopographic maps issued in 1894, 1920, 1953, 1967, 1979 and 1997. The data set wassubjected to authentic geometric homogenization and corrections.Figure 36. The difference in meters after surface matching between DEMS generated from airbornelaser scanner and IKONOS data from Hintereisferner, August 12, 2003. The differences larger thanfive meters have been left out.Relation between digital elevation modelsThe objective was to estimate the accuracy (bias and precision) of the long-term change in thevolume of a glacier between two instants. It was assumed that the bottom of the glacier51