The greater the soil moisture, the more
incident radiant energy absorbed and the less
reflected energy.
The dry soil has a relatively simple, increasing
spectral response throughout the region from
0.5-2.6 m.
However, as the soil moisture increase, the
result is a much more complex spectral
response, with characteristics dips in the
reflectance curve at the 1.4, 1.9, and 2.7 m
atmospheric water-absorption bands.
Higher moisture content in (a) sandy soil, and
(b) clayey soil results in decreased reflectance
throughout the visible and near-infrared region,
especially in the water-absorption bands at 1.4,
1.9, and 2.7 m.