The P-3 UHF-UWB system offers a unique capability for remote sensing of forest regions because the low-frequency waveform penetrates foliage and the time resolution allows imaging of individual tree trunks. A tree trunk combined with the ground under it forms a dielectric top hat reflector which is a dominant scattering mechanism. The scatter from the ground-trunk interface is strongly dependent on polarization with Horizontal incidence-Horizontal reflection typically being much stronger than Vertical incidence-Vertical reflections. The cross-polarized components of the scatter is typically much weaker; however, heavily sloped terrain can cause a polarization rotation upon reflection which can cause significant cross-polarization. Estimates of the cross-polarized image can therefore be used to determine terrain characteristics.