Research on Quantitative Evaluation of Remote Sensing and Statistics Based on Wireless Sensors and Farmland Soil Nutrient Variability

Table 4

Parameters of the semivariance function model of the soil nutrient index.

Scale	Variable	Theoretical model	NuggetCo	SillCo + C	Nugget/Sill (%)	Range (m)	Decisive factor R^2	Residual (RSS)
County	AN	Exponential	0.00235	0.01549	15.13	410.01	0.429	9.73 × 10^−6
	AP	Exponential	0.00891	0.07851	11.33	320.01	0.611	5.68 × 10^−5
	AK	Exponential	0.00582	0.03245	17.92	390.01	0.638	1.96 × 10^−5
Field	AN	Gaussian	0.00011	0.11821	0.09	118.31	0.424	6.16 × 10^−4
	AP	Exponential	0.00011	0.04061	0.26	55.41	0.958	2.41 × 10^−7
	AK	Gaussian	0.00002	0.01573	0.07	112.21	0.558	7.57 × 10^−6
Plot	AN	Exponential	0.00241	0.05861	4.11	18.61	0.26	3.75 × 10^−5
	AP	Exponential	0.00351	0.04631	7.57	43.31	0.731	1.58 × 10^−5
	AK	Exponential	0.00154	0.01107	13.84	27.61	0.362	8.15 × 10^−7