A culmination line (synonym ridge, summit line, apex line) connects the summit points on the back, ridges, etc. and thus represents the counterpart to the depth lines. Culmination grid cells shall have a certain divergence index, a minimum scattering angle (scatter angle = maximum angular difference of exposures around the considered grid cell) and a minimum amount of symmetric relief energy. (Note: a strongly asymmetric relief energy exists, e.g. in small elevations on the edge of a terrace edge.) Optionally, thresholds for maximum inclination as well as for height above depth line and the soil moisture index can be selected.
Definition and calculation according to KÖTHE 2002-2006
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