Height difference between two points in relation to their horizontal distance, given in per cent (%) or degrees (°). The angle of inclination results from the ratio of the difference in height to the horizontal distance. Mathematically, the function "arcus tangens" is used for this. An upward slope is called an incline, a downward slope is called a decline. Both terms describe the same geometric relationship; they differ only in the direction of view and language used. Significant slopes are:

1 = Radiation angle at the ground 90 degrees (zenith), strong ground heating
2 = Angle of irradiation at ground level 45 degrees, low ground heating
3 = Radiation angle at ground level 90 degrees, strong ground heating
It should be noted that the angle of inclination and slope are not proportional to each other. A conversion using a final calculation is therefore not possible. The slope increases dramatically with increasing angle of inclination. At 80° this corresponds to around 567%, at 89° to around...
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