Fig. 4.

An orthomosaic of the vernal pool region of the Whetstone Savanna Preserve in southern Oregon generated from aerial images collected using a small drone (DJI Phantom 2 Vision+). To the north is a rural road and light industrial complex. There is a fence line along the west side that is evident as a linear disruption in the vegetation. Along the east side is an agricultural field, and to the south is oak savanna. Examples of shrub, swale (vernal pools), and trees are indicated. Hummocks are regions that generally border between swales and shrubs.