On Thu, Jan 7, 2016 at 3:40 PM, Colin Smale <colin.sm...@xs4all.nl> wrote:
> Cliffs are never truly vertical. A bird's eye view from above will show > that. If they are steep enough they could be modelled as a line, but in > general we should allow for a polygon, with a high side and a low side. > Actually, sometimes they are "less than vertical", in other words, overhanging, e.g. [1] [1] https://s-media-cache-ak0.pinimg.com/736x/9c/52/0e/9c520e8e1e327be4bc844b950544aac6.jpg
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