The Determination of the Direction of Movement on Glacier Surfaces by Terrestrial Photogrammetry

Abstract

In order to determine longitudinal profiles of movement on glacier surfaces from photogrammetric surveys, it is necessary to know the direction of movement. The present method requires at least two base lines with overlapping ranges of photographs. The establishment of a base-line system for a given glacier form depends on the demands of accuracy. The method is applied to the movement of the glacier Kongsvegen (Vestspitsbergen) and the accuracy obtained is discussed. The movement direction of the points on the medial moraine of Kongsvegen does not coincide with the moraine direction.