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Appendix O2 - Biophysical Report.pdf - Zitholele.co.za

Appendix O2 - Biophysical Report.pdf - Zitholele.co.za

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February 2011 77 12619between the proposed power lines and the landscape will not change. The <strong>co</strong>ne of vision isrelatively wide and the viewer tends to scan back and forth across the landscape.In <strong>co</strong>ntrast views from a moving vehicle are dynamic as the visual relationship between theproposed power line infrastructure is <strong>co</strong>nstantly changing as well as the visual relationshipbetween the proposed power line and the landscape in which they it is seen. The view <strong>co</strong>ne formotorists, particularly drivers, is generally narrower than for static views.View ElevationThe elevation of the viewer relative to the object observed significantly influences the visibility ofthe object by changing the background and therefore the visual <strong>co</strong>ntrast. In situations where theviewer is at a higher elevation than the building/structure it will be seen against a background oflandscape. The level of visual <strong>co</strong>ntrast between the proposed power line and the background willdetermine the level of visibility. A white/bright <strong>co</strong>loured structure seen against a background ofdark/pale <strong>co</strong>loured tree-<strong>co</strong>vered slopes will be highly visible <strong>co</strong>mpared to a background of light<strong>co</strong>loured slopes <strong>co</strong>vered by yellow/brown dry vegetation.In situations where the viewer is located at a lower elevation than the proposed power lines it willmostly be viewed against the sky. The degree of visual <strong>co</strong>ntrast between white <strong>co</strong>loured structureswill depend on the <strong>co</strong>lour of the sky. Dark grey clouds will create a significantly greater level of<strong>co</strong>ntrast than for a background of white clouds. The photos below illustrate this effect, where theview from above is far less visible.View DistanceFigure 8-1: Difference in view from below (left) and above (right)The influence of distance on visibility results from two factors:• With increasing distance the proportion of the view <strong>co</strong>ne occupied by a visible structure willdecline; andZITHOLELE CONSULTING

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