Net solar radiation evaluation from remotely sensed multispectral data over wheat crop

A study was conducted during rabi season 1997–98. The incoming, reflected and net solar radiations were measured at various phenological stages in wheat crop (R_SN). The net solar radiations over wheat crop ranged between 531–811 w/m², while remotely sensed net solar radiations (R_SN) varied from 831 to 1281 w/m²/sr. A regression equation was developed between solar radiation measured and estimated by remote sensing which is" of the form:

R_SN = 135.15 + 0.505 R'_SN, R² = 0.86

This regression equation can be used to convert remotely sensed solar radiation into actual net solar radiation.