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- Title
What moderates the terrain reversal effect in shaded relief maps?
- Authors
Çöltekin, Arzu; Griffin, Amy L.; Ganarin, Rahel; Rautenbach, Victoria; Coetzee, Serena; Mdleleni, Azile
- Abstract
Shaded relief terrain representations are often used by map makers to produce a depiction of terrain that the map reader can understand intuitively. Such representations use modelled shadows cast by a light source that is positioned at a particular orientation with respect to the terrain, typically an azimuth in the northwestern quadrant. While this method often produces a depiction of the terrain that helps map readers develop an accurate understanding of the terrain features, it is affected by a perceptual illusion. This illusion can make terrain features appear to sink into the landscape rather than protrude from it and vice versa. It occurs when the modelled light source that produces shadows is oriented at angles other than those from which the human visual system assumes they will come. Previous research on this inversion phenomenon has documented its occurrence in shaded relief maps (Imhof, 1967; Bernabé-Poveda and Çöltekin, 2015; Biland and Çöltekin, 2017) as well as satellite imagery (Saraf et al., 1996; Bernabé-Poveda et al., 2005; Çöltekin and Biland, 2019).
- Subjects
TERRAIN mapping; RELIEF models; TOPOGRAPHIC maps; AZIMUTH; REMOTE-sensing images
- Publication
Abstracts of the ICA, 2023, Vol 6, p1
- ISSN
2570-2106
- Publication type
Article
- DOI
10.5194/ica-abs-6-40-2023