It is hoped that average albedo can be correlated with one or more parameters, such as age, sex, race, or hair color. The sample is distance-limited. Location and time were chosen to achieve as random a sample as possible, although systematics are expected. Overlapping images were acquired, and show a variation in the illumination, both ambient and instrumental. The data has not been corrected for illumination effects.
Further study is needed to characterize the spatial variation quantitatively.
Other improvements in the observing techniques are planned.