136 
Figure 7 - Punctual differences of DSMs realized with 1998 and 1992 surveys. 
Differences in vertical sections 
102.00 
102.00 
Figure 8 - 
-5.00 
to 
-4.00 
-4.00 
to 
-3.00 
-3.00 
to 
-2.00 
o 
o 
<7 
to 
-1.00 
-1.00 
to 
0.00 
0.00 
to 
1.00 
1.00 
to 
2.00 
2.00 
to 
3.00 
3.00 
to 
4.00 
DTM differences (1998 - 1992) 
100.00 
98.00 
96.00- 
Vertical Section 
1992 
1998 
100.00 
98.00 
96.00 
0.00 10.00 20.00 
Z (cm) 
(a) 
30.00 
-0.09 -0.06 -0.03 0.00 
dz (m) 
(b) 
0.03 
Figure 6- a) Vertical profiles concern 1992 and 1998 surveys (DIGICART 40). Every measured point is represented by a 
symbol. The full circle concern the measures realized in 1992 and the cross concerns the outline of 1998. b) 
Punctual differences between the vertical profiles of 1998 and that of 1992. In the abscissa there are the 
shifting in depth while in the ordinate the y-coordinates.