668
1:20 000
1:10 000
1:5 000
1:3 000
CL
O
Q_
<
AP J OP
1
AP j OP
1
AP | OP
Differentiation
1
1
1
1
of rock and
-/o 1 -/o
o
o
+*
++ |+++
++ 1 ++
soil units
1
1
1
1
1
I
Recognition of
1
1
1
1
1
1
1
1
slope instability
0 1 o
4- , 4+
♦ 1 ++
++ l 4+*
phenomena
1
1
1
1
1
1
Recognition of
1
1
1
1
1
1
erosion
0 o
+ +
++ - ++
++ ++
phenomena
1
1
1
1
1
- = inadequate; o = of limited use; + = useful;
+++ = extremely useful
= very useful:
Figure 2. Comparison of the quality of interpretation using aerial photography (AP) and orthophotography with
stereomates (OP), at various scales prepared by enlargement from original photography at a negative scale of
1 :22,000.
line map (fig. 4) on which the photo interpretation
results can be plotted.
REFERENCES
Grabmaier, K. 1983. Production of proper stereo
orthophotographs. ITC Journal 1983-2: pp. 119 to
122.
IAG, 1981. Report of the IAEG Commission on Site
Investigations, Bulletin of the IAEG No. 24: pp.
185-226.
Sissakian, V., R. Soeters & N. Rengers, 1983.
Engineering Geological Mapping from Aerial
Photographs: the influence of Photo Scale on Map
Quality and the Use of Stereo orthophotographs.
ITC Journal 1983-2: pp. 109-118.
Soeters, R. and N. Rengers 1981. An Engineering
Geological Map from Large Scale Photography.
ITC Journal 1981-2: pp. 140-152.
Sympoi
Small
in the
Jose Mai
San Migue
ABSTRACT
a surve’
con d i t i oi
l a n d s a t
units ch,
the USLE
allow t q
criteria
I NTR0DUC1
In de ve l c
maps mig\
the regie
detect a r
processes
measures
vegetatic
lands t h r
s t a b l i s h
Final ly ,
the compl
the va r i e
must be s
The reg
the north
and geomo
severely
processes
disturbed
carry out
to s t a b l i
mapping o
ing betwe
Fo r the
logical u
internal
the basic
erosion.
In that
tion a s s u
m u 1 t i d i s c
ive p u r s u
the eva1u
app1 i cat i
t e s mo re
use of me
Soil Loss
THE GEOMO
Based
Zonne'
a re 1
has b(
re 1 i e
f a c t o i
other
hid ro'
i n c 1 uc
geomoi
regior
mo r p he
