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Difference in height of two points in relation to their horizontal distance in percent. The angle is calculated with: arcus tangens x (height difference / distance). An upward slope is called a gradient, a downward slope (the two terms are only linguistically different, mathematically there is no difference). At 30% slope, the other point 100 metres away (horizontally) is 30 metres higher, which results in an angle of 16.69°. A slope of 75% results in 36.87°. A slope of 100% corresponds to an angle of 45°, i.e. 100 metres horizontally and 100 metres vertically. Up to this incline, the use of monorack railways (single-rail rack railways) is possible in viticulture. A slope of 200%, on the other hand, corresponds to an angle of ~64°. For slope angles just below 90°, the slope grows to infinity. A slope of 90° corresponds to a vertical wall. More than 90° corresponds to overhanging walls.

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