“…Zube et al (1975), Daniel and Vining (1983), Knopf (1987), Orland (1988) and Purcell (1992) determine a negative relationship between man-made elements and visual quality, as we do for negative antropic elements. Furthermore, Purcell concludes that public prefer pictures highly typical with large amount of vegetation, as it occurs in our model with the percentage of vegetation.…”