Remote sensing applications related to vegetation environments
began with radar imaging at early 70s, with the use of a
K-band radar installed on an aircraft to analyse the effect on vegetation
. The goal of that paper was the analysis of the differences
on wave penetration depth depending on the moisture, the angle
of incidence, and other parameters. Few years later, different
works conducted by Ulaby focused on the radar response to vegetation
at C-band and X- to Ku-bands to analyse radar performance
for identifying different vegetation species. For most of
these studies, vegetation is no more than an obstacle to measure
soil moisture. Besides such experimental works, different
authors published different models during the late 70s and early
80s region, and they will spread the rest of the power
around their volume, reducing the signal reflected towards the
radar receiver.