Spatially Explicit Estimation of Clay and Organic Carbon Content in Agricultural Soils Using Multi-Annual Imaging Spectroscopy Data
Table 5
Calibration and validation performance statistics of laboratory spectra.
Parameter
Clay
Model name
Number of samples (cal/val)
Preprocessing
Number of LV
SDcal†
SDval†
SEC
SD/SEC
SEP
RPD
Lab_2004_Clay
20/115
Absorption
6
48.21
75.21
0.76
29.30
1.65
26.59
2.54
Lab_2005_Clay
38/97
First derivative of absorption
5
49.32
70.06
0.90
17.42
2.87
20.77
3.25
Lab_2005_Clay
38/29
First derivative of absorption
5
49.32
48.08
0.90
17.42
2.87
19.48
2.69
Lab_2008_Clay
11/124
Absorption
5
39.92
69.18
0.70
35.68
1.28
35.55
1.86
Parameter
Organic carbon
Model name
Number of samples (cal/val)
Preprocessing
Number of LV
SDcal†
SDval†
SEC
SD/SEC
SEP
RPD
Lab_2004_OC
20/115
Absorption
2
2.53
3.77
0.51
2.36
1.34
2.36
1.71
Lab_2005_OC
38/97
Absorption
6
2.87
3.90
0.88
1.11
2.67
1.92
2.16
Lab_2005_OC
38/29
Absorption
6
2.87
2.63
0.88
1.11
2.67
1.94
1.93
Lab_2008_OC
11/124
First derivative of absorption
4
1.49
4.12
0.78
0.97
1.52
2.46
1.58
†SD: standard deviation of estimated parameter values in (g kg−1), : coefficient of determination, SEC: standard error of calibration in (g kg−1), SEP: standard error of validation in (g kg−1), RPD: ratio of performance to deviation.
