Oru maht on pinna karedusparameeter, mis põhjal on võimalik arvutada pinnaprofiilis olevate orgude keskmise mahu. Oru maht määratakse pinna jagamise teel eraldiseisvateks, suletud "orgude" piirkondadeks – tavaliselt hindamisala algoritmi abil – ja igas piirkonnas sisalduva mahu arvutamise teel, mida sageli kasutatakse, et kärpida ja eemaldada ebaolulised madalad tunnused.
Dale local volume is a surface roughness parameter that calculates the average volume of the dales (valleys) within a surface profile, and is determined by partitioning the surface into distinct, closed "dale" regions - typically using a watershed algorithm - and calculating the volume contained within each, often pruned to remove insignificant, shallow features.
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