Table 2:
Number of spectral features used and total number of calculated variables for determination of key soil constituents.
Absorption features
(6 var.)
Curve features
(1 var.)
Hull features
(2 var.)
Total number of variables
2
1
0
2
15
Iron
3
1
1
21
Clay
2
0
2
16
1
For the AF near 1730 nm, only five variables are calculated (see text).