1. Introduction
High-resolution three dimensional (3D) data capture is required
at all scales in the geosciences, from hand specimen to landscapes,
and a range of tools are available for addressing different portions
of the scale spectrum (e.g., McCaffrey et al., 2005). In particular,
recent advances in high-resolution digital 3D data collection are
dominated by active source sensors, predominantly based upon
laser scanning technologies (e.g., LiDAR), which measure distance
to a target based upon the travel time of reflected light (e.g.,
Hodgetts, 2013). However, a new development in high-resolution
3D data collection exploits a very common and widely accessible
passive imaging source e digital photography. Geoscientists have
long utilized the 3D information available through