Surface Soil Moisture Estimation Using a Neural Network Model in Bare Land and Vegetated Areas

Table 3

The results for BPNN in four groups respective to the pixels land surface feature values.

Elevation ≤ 4500 m	4500 m < Elevation ≤ 4600 m	4600 m < Elevation ≤ 4700 m	4700 m < Elevation
R	r	r	r
0.9197	0.9082	0.8552	0.8186
Slope ≤ 3.5°	3.5° < Slope ≤ 5.5°	5.5° < Slope ≤ 9°	9° < Slope
r	r	r	r
0.9283	0.8992	0.8138	0.7513
North aspect	East aspect	South aspect	West aspect
r	r	r	r
0.6972	0.8937	0.9395	0.8718
NDVI ≤ 0.25	0.25 < NDVI ≤ 0.40	0.40 < NDVI ≤ 0.55	0.55 < NDVI
R	R	R	R
0.8724	0.8801	0.8916	0.8786