Fig. 11 Ground surface model 
—422- 
  
Fig.12 4 stages in Pengtoushan site 
3D 
Full 
E-ma 
The r 
order 
the B 
It has 
Mode 
The 
photo 
KEY 
The 1 
rectif 
comm 
to pre 
rectifi 
to me 
floodi 
In pa 
gener 
interp 
issue 
In thi 
the sc 
acq 
risk 
Tesc 
- cali 
ther 
- proc 
on ( 
leve 
DX 
con 
plat 
- ha 
- mn 
disc 
autc 
and 
- inter