Fig. 2. SPSI referenced from [40].ACis the “wet edge,” andBDis the “dry edge”
of NIR–SWIRreflectance space. In general, objects placed close to the coordinate
origin at soil line are bodies of water or extremely wet surface targets. Pixels
located closer to the line along theACside of the trapezoid represent vegetation
pixels with larger canopy water content or vice versa.