Application of the Finite Difference Parabolic Equation Model in Forestry Remote Telemetry

Table 2

Fitting coefficients for different volume content.

Volume content (%)	Effective permittivity		Polynomial fitting coefficients				MAE	MAPE (%)	R^2
	Ɛe(Min)	Ɛe(Max)	ω0	ω1	ω2	ω3
0.05	1.0029 + 2.18e − 5i	1.0032 + 10.08e − 5i	0.0060	0.0881	3.2544	95.3743	0.0118	0.0107	1.0000
0.10	1.0059 + 4.36e − 5i	1.0065 + 20.20e − 5i	0.0328	−0.0595	7.4703	97.4674	0.0903	0.0704	0.9999
0.15	1.0088 + 6.56e − 5i	1.0097 + 30.35e − 5i	−0.0533	0.8019	8.8257	102.3991	0.2409	0.1704	0.9998
0.20	1.0118 + 8.76e − 5i	1.0130 + 40.53e − 5i	−0.2875	1.9938	11.6821	103.1542	0.7008	0.4337	0.9986