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A platform for research: civil engineering, architecture and urbanism
Techniques for highlighting relief on orthoimaginery
In cartographic products such as shaded relief maps or orthoimagery, the direction of illumination can cause a perceptual phenomenon called terrain reversal effect where the depressions appear as peaks and vice versa. This is the case for predominantly north-oriented shaded relief maps and geographic imagery in the northern hemisphere. The problem is a troubling one for distinguishing three-dimensional spatial relationships between the landforms, photo interpretation, and possibly for image classification tasks. Rotating the image or creating a negative of it seems to reverse the spatial relationships back to the intended representation, however these are poor solutions. The former discards the familiarity of the north-orientation and is prone to confuse the viewer, and latter modifies the color information in such a fundamental way that it is nearly impossible to tell the natural features apart. Currently there are only a few technical solutions that address this issue. With this paper, we contribute a range of techniques that explore the possibility of merging a perceptually-driven adjustment of a hill shading model with the orthoimagery to visualize the depth information in a perceptually correct manner.
Techniques for highlighting relief on orthoimaginery
In cartographic products such as shaded relief maps or orthoimagery, the direction of illumination can cause a perceptual phenomenon called terrain reversal effect where the depressions appear as peaks and vice versa. This is the case for predominantly north-oriented shaded relief maps and geographic imagery in the northern hemisphere. The problem is a troubling one for distinguishing three-dimensional spatial relationships between the landforms, photo interpretation, and possibly for image classification tasks. Rotating the image or creating a negative of it seems to reverse the spatial relationships back to the intended representation, however these are poor solutions. The former discards the familiarity of the north-orientation and is prone to confuse the viewer, and latter modifies the color information in such a fundamental way that it is nearly impossible to tell the natural features apart. Currently there are only a few technical solutions that address this issue. With this paper, we contribute a range of techniques that explore the possibility of merging a perceptually-driven adjustment of a hill shading model with the orthoimagery to visualize the depth information in a perceptually correct manner.
Techniques for highlighting relief on orthoimaginery
Bernabé-Poveda, M A (author) / Sánchez-Ortega, I (author) / Cöltekin, Arzu (author)
2011-01-01
Bernabé-Poveda, M A; Sánchez-Ortega, I; Cöltekin, Arzu (2011). Techniques for highlighting relief on orthoimaginery. Procedia - Social And Behavioral Sciences, 21:346-352.
Article (Journal)
Electronic Resource
English
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