Figure 4. The effect of 50, 100, 200 and 400 µm optical scanning intervals on a DEM. Note that DEMs constructed from fewer sections are coarse, stepwise representations of the tooth crown. The DEMs profiles (below) are along the black line drawn between the paracone and protocone. Profiles are useful in determining whether DEMs require smoothing prior GIS analysis. Anterior (mesial) is toward the left, and lateral (buccal) toward the top.