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Fig. 2

image

Schematic representation of the adopted geometry and of the parameters used for determining the boulder height. Σ is the average surface plane, Π is the plane containing the normal n to Σ and the illumination vector, i is the incidence angle, Q refers to the peak of the shadow, which is defined by the highest point of the boulder P, and L is the length of the shadow. Finally, H is the heightof the boulder.

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