Spatially Explicit Estimation of Clay and Organic Carbon Content in Agricultural Soils Using Multi-Annual Imaging Spectroscopy Data

Table 4

Descriptive statistics of the calibration and validation data sets for the prediction of clay and organic carbon content with laboratory and HyMap image spectra.

Calibration data sets
Laboratory	HyMap	Number of samples	Clay (g kg^−1)				Organic carbon (g kg^−1)
			Mean	SD	Min	Max	Mean	SD	Min	Max
Lab_2004	HyMap_2004	20	108.07	48.38	48.03	186.64	9.60	3.17	5.25	19.59
Lab_2005	HyMap_2005	38	99.12	50.05	38.45	216.18	9.16	2.95	5.01	17.48
Lab_2008	HyMap_2008	11	97.31	45.68	52.22	197.20	6.66	1.47	4.31	10.34
Validation data sets
Laboratory	HyMap	Number of samples	Clay (g kg^−1)				Organic carbon (g kg^−1)
			Mean	SD	Min	Max	Mean	SD	Min	Max
Lab_2004	—	115	130.22	67.45	36.53	329.47	10.42	4.02	4.31	24.79
Lab_2005a	—	97	137.83	67.53	36.53	329.47	10.74	4.16	4.31	24.79
Lab_2005b	HyMap_2005	29	92.06	52.36	36.53	237.52	8.89	3.73	5.55	24.79
Lab_2004	—	124	129.57	66.26	36.53	329.47	10.62	3.90	5.01	24.79