When landslides occur, not only the slope itself but also the trees on the slope will move with the landslides. This is why tilt trees on a slope are a good indication of past landslides, and why the tilt angles of trees can be used to monitor the slow movement of underlying slopes. In this study, the authors measured the tilt angles of trees at the Houshanyue landslide site. Two sets of three ultra-high resolution panoramic images were used to triangulate the locations of the trees. The triangulation was done for the tops and bottoms of the tree trunks, respectively. The tilt angles were calculated using simple trigonometry. The results showed that the method achieved its purposes, and it could be applied to the future monitoring of unstable slopes.
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