Table 2 
Comparison of ERTS-1 interpretation with Soil Map of Spain 
Scale 1 : 1, 000, 000 
Mapping Symbols 
SMS ERTS-1 
Comparison of analysis 
Soil Map of 
Spain 
ERTS-1 
interpretation 
1 
A 
Analysis fits well 
+ 
+ 
2 
S 
Analysis fits well, probably better on ERTS-1 
map 
0 
+ 
3 
B 
Not recognized on ERTS map, area of 
limited extent, < 1% 
+ 
4 
M+O 
Analysis not coinciding, complex area 
+ 
- 
5+6 
c 
Analysis of ERTS-1 imagery is based upon 
physiography. Soil Map of Spain based upon 
0 
0 
5+6 
B 
profile characteristics and lithology. Geological 
structures, drainage, and vegetation/land use 
0 
0 
5+6 
L 
show on ERTS-imagery. Lithology difficult. 
Hence different mapping criteria. Moderate 
rating for both approaches. Area > 50%. 
0 
0 
7 
R 
Analysis fits well; little difference in judge 
ment on profile development 
+ 
+ 
8 
B 
Analysis not coinciding, probably wrongly 
interpreted on ERTS-1 imagery; area of 
limited extent, approx. 1% 
+ ? 
9 
c 
Not recognized; this unit is included in 5+6 
during ERTS-interpretation 
+ ? 
- 
10 
M 
Analysis of both 10 and 11 fits well at higher 
level of interpretation; extent as well as soil 
0 
- 
11 
M 
classification of units of Soil Map of Spain may 
require revision; the miocene clay area is one 
of the best recognizable landforms on ERTS-1 
imagery 
0 
12 
o 
Analysis not coinciding; highly complex area 
which is not reflected in existing 1:1, 000, 000 
Soil Map of Spain 
+ ? 
0 
Ratings: + = good; 0 = moderate; - = poor 
oo 
CO 
CO 
208