Remote sensing is an integral part of rangeland mapping and is increasingly being adapted for assessment and monitoring. A wide variety of imagery, from medium resolution satellite images to high-resolution aerial photos, has proven useful in this field (Booth and Tueller, 2003). Very high-resolution imagery, with decimeter or sub- decimeter pixel resolution, can be acquired from unmanned aerial vehicles (UAV). This type of imagery has the potential for quantifying spatial patterns of vegetation and soil, and allows for calculating landscape metrics used in rangeland assessment and ecosystem models (Bestelmeyer et al., 2006). UAV imagery can bridge the gap between remotely sensed imagery from aerial and satellite platforms and detailed ground-based observations commonly used for rangeland monitoring. UAVs have several advantages over piloted aircraft. An unmanned system can be deployed quickly and repeatedly for assessment of effectiveness of rangeland remediation techniques; a UAV poses less risk because there is no pilot; it is less costly than piloted aircraft; and it can fly low to the ground and can obtain sub-decimeter resolution imagery.