64 
The choice of a regular grid allows to compare the variation in manage the DTM in the studio areas to allow the control in the 
the time of the height. It has been defined a programme to time of the variation of volume. 
ï3?«ig 1 ‘isaae 'A^vftyr ■ ‘■rcgraff ‘itWMii Ssëft'ag" " ~ ‘¡¡aéfeoa 
Fig. 9. Contour line representation of a quarry (Cemusco sul Naviglio) 
3. GIS technology to support the management of the data 
during the time 
A GIS has been realized due to manage the data using Arclnfo 
(ESRI) on NT platform: through the ASCII, *.txt, *.* files, 
with the 3D co-ordinate of the points, using the TIN module it 
has been built on the DTM the 3D model to support the 
valuation of 
the volumes and the analysis of the variation in the time in 
function of the subsequent surveys at the different temporal 
phases. A standard and appropriate methodology can become 
an agile real time instrument for the advancing of the 
extractive activity: GIS could be used by both public 
administration and private subject to of the work organization 
and of control in the time.