Further developments on digital models in a control problem for the Ancona '82 landslid

In December 1982, a large scale landslide )220 ha) has interested the district of Ancona (Italy), involving also some residential quarters of the city. A working group consisting of geologist, geophysicists, geotechnicians and geodesists has been set up in order to analized the causes, to control the ground settling and to determine the consequent destination of the area. Inside this working group, the geodesists have performed the control surveying by topographic and photogrammetric instruments. The former is a still going operation intended to control the settlement of the terrain after the landslide, the latter is mainly the study of the deformation of the landslide occurence. The photogrammetric models are observed in order to achieve a regular grid of points on the ground. In this way it has been possible: - to compute the earth settlements; - to evaluate the volumes involved; - to analyzed the shape and the pattern of the break lines; - to point out the landslide boundary. This paper presents the results obtained in this context.