FURTHER DEVELOPMENTS ON DIGITAL MODELS IN A CONTROL PROBLEM FOR THE
"ANCONA '82" LANDSLIDE
Luigi Colombo*, Gabriele Fangi**, Luigi Mussio*, Fabio Radicioni**
* Politecnico di Milano
Milano, Italy
** Università di Ancona
Ancona, Italy
ABSTRACT
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 geologists, geophysicists, geo-
technicians and geodesists has been set up in order to analyze the causes,
to control the ground settling and to determine the consequent destina-
tion of the area. Inside this working group, the geodesists have perform-
ed 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 landscape derived from photogrammetric material taken
before and after the landslide occurrence. 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 analyze the shape and the pattern of the break lines;
- to point out the landslide boundary.
This paper presents the results obtained in this context.
FOREWORD
After the Ancona '82 landslide, some combined studies were carried out
in order to examine all the possible aspects of the event both from a
geological and geodetic point of view. In particular the first photogram-
metric aim was to detect the global movements of the slide. The task was
performed by means of aerial triangulation, using two photogrammetric
coverages taken before and after the occurrence. The results obtained
were described in a previous paper presented to ISPRS Symposium in Rio
de Janeiro. Further developments of this study regarded the volumes com-
putation of the slide masses, shifts and other fields concerning the mo-
tion (ground deformation parameters) applying digital modelling tech-
niques to height-variations of natural points on the terrain.
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