Visualizing topography by openness: A new application of image processing to digital elevation models

By R. Yokoyama, Mlchlo Shlrasawa, Richard, Pike. 2002

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An illustrated introduction to general geomorphometry (2017, background): “Openness (Yokoyama et al., 2002), incorporating the viewshed concept (Fisher, 1996), is also a two-field specific variable.”
Sky-View Factor as a Relief Visualization Technique (2011, methodology): “Positive openness equal to the mean zenith angle of all determined horizons (Yokohama et al. [29] suggest also the negative openness which is based on nadir angles).”