Judgements of eye level in outdoor scenes
Ross, HE, Nawaz, S & O'Shea RP 2000, 'Judgements of eye level in outdoor scenes', in KA Brookhuis, D De Waard & CM Weikert (eds), Human factors in telecommunications -implications for the aged and disabled: Proceedings of the Human Factors and Ergonomics Society Europe Chapter Annual Meeting in Martlesham Heath, UK, November 1999, Martlesham Heath, UK, November 1999, Shaker Publishing, Maastricht., pp. 11-14.
Illusions of apparent pitch and height in undulating scenery imply changes in visually perceived eye level (VPEL). Measurements of VPEL on level ground showed a small positive error, and no effect of viewing distance. In varied terrain VPEL was biassed towards the dominant ground pitch. Downhill frontal slopes of 15 deg were less effective than shallower slopes. Views from a height raised VPEL by 0.4-0.7 deg compared to ground views. Most errors are explained by the dominant perspective of the foreground.