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Figure 2: Top: The raw data of 1991 and 1995 (400 x 716 pixels each, 1800 m altitude, 20 s recording time, ca. 2100 m east- 
west ground distance). Bottom: Registered to map of scale 1:25 000 (using thin-plate spline registration with U(r) — r^Inr). 
953 
International Archives of Photogrammetry and Remote Sensing. Vol. XXXI, Part B4. Vienna 1996