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Table 5 Parameters of the theoretical semivariogram models of the residuals for the RFOK and RFCK models

From: Machine learning and geostatistical approaches for estimating aboveground biomass in Chinese subtropical forests

Model parameter Theoretical model Nugget Sill Nugget/Sill ratio Range (degree) R2 RSS
1992_RFOK Gaussian 9.95 27.19 0.366 0.618 0.921 80.90
1992_RFCK Gaussian 8.11 12.42 0.653 0.653 0.923 52.15
2002_RFOK Exponential 402.91 507.46 0.792 0.935 0.139 9865.00
2002_RFCK Exponential 365.46 482.14 0.758 0.905 0.143 9217.00
2010_RFOK Spherical 307.80 328.50 0.937 0.348 0.156 9364.00
2010_RFCK Spherical 302.93 312.96 0.968 0.492 0.181 8124.50