Active and passive optical sensing methods.|@|~(^,^)~|@|Variations of SZAs in remote sensing; θ1 with the high SZA where after a while SZA reduces to θ0.|@|~(^,^)~|@|The impact of atmospheric scattering on pixel intensity (%).|@|~(^,^)~|@|The standard deviation of all the VIs for soybeans under three different illumination conditions.|@|~(^,^)~|@|Ideal data acquisition timing for active and passive sensors.