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Techniques for highlighting relief on orthoimaginery


Bernabé-Poveda, M A; Sánchez-Ortega, I; Coltekin, Arzu (2011). Techniques for highlighting relief on orthoimaginery. Procedia - Social And Behavioral Sciences, 21:346-352.

Abstract

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.

Abstract

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.

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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Institute of Geography
Dewey Decimal Classification:910 Geography & travel
Language:English
Date:2011
Deposited On:26 Jan 2012 13:00
Last Modified:17 Feb 2018 14:22
Publisher:Elsevier
ISSN:1877-0428
OA Status:Hybrid
Publisher DOI:https://doi.org/10.1016/j.sbspro.2011.07.028

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