Sizes visible fragments on the muckpile surface at full source resolution, fits Rosin–Rammler and Swebrec, and compares the result against a Kuz-Ram prediction from the design.

Accuracy is governed by ground sample distance. Nothing smaller than about three pixels can be delineated, so the tool states its detection limit and refuses to report a distribution the image cannot support rather than producing a plausible-looking wrong answer. Use a dust-free frame after the muck settles — ideally a survey-grade drone still.