Spatially Explicit Estimation of Clay and Organic Carbon Content in Agricultural Soils Using Multi-Annual Imaging Spectroscopy Data
Table 7
Calibration and validation performance statistics of HyMap image spectra.
Parameter
Clay
Model name
Number of samples (cal/val)
Preprocessing
Number of LV
SDcal†
SDval†
SEC
SD/SEC
SEP
RPD
HyMap_2004_Clay
20
Absorption
3
44.72
—
0.80
23.39
2.07
—
—
HyMap_2005_Clay
38/29
First derivative of absorption
3
47.18
50.49
0.85
20.34
2.46
19.41
2.70
HyMap_2008_Clay
11
Absorption
3
42.36
—
0.92
15.99
2.86
—
—
Parameter
Organic carbon
Model name
Number of samples (cal/val)
Preprocessing
Number of LV
SDcal†
SDval†
SEC
SD/SEC
SEP
RPD
HyMap_2004_OC
20
First derivative of absorption
3
2.70
—
0.62
2.13
1.48
—
—
HyMap_2005_OC
38/29
First derivative of absorption
2
2.58
2.20
0.71
1.64
1.80
2.07
1.80
HyMap_2008_OC
11
First derivative of absorption
5
1.20
—
0.45
1.61
0.91
—
—
†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.