The members of the two International Glaciological Greenland Expeditions (EGIG) in 1959 and 1968 determined the altitudes in the West-East-profile by levelling. The comparison of these two measurements gives evidence of the change of altitudes and of the surface-waves. The ways of measurement and of analysis are described here. The graphic representation of the result is discussed here in connexion with the possible causes.
Caution! Values are not truly measured!Data were digitized from printed Abb. 3 (top) by using the software GraphClick (http://www.arizona-software.ch). Precision of values was set to 100 m for distance and centimeter for snow thickness.
Supplement to: Seckel, Hansjörg; Stober, Manfred (1968): Höhenänderung des grönländischen Inlandeises 1959 - 1968. Polarforschung, 38(1/2), 215-221