"Granular Material Imaging Dataset"

"This dataset presents soil particle images corresponding to sieve-based Particle Size Distribution obtained from black cotton soil sourced from Maharashtra, India. A bulk sample of 1500 g was processed using mechanical sieve analysis using ASTM\/ISO standard sieves (2.36 mm to 0.075 mm) under mechanical vibration for 15 minutes in three stages of 500 grams each. Representative fractions from each sieve were used for multi-scale image acquisition. A total of 1350 smartphone images were captured using an iPhone 15 Pro Max under controlled lighting at three heights (15 cm, 30 cm, 45 cm), incorporating repeated disturbance cycles to ensure variability in particle exposure. Additionally, 1350 microscopic images were acquired from sub-sampled sieve fractions using varying magnifications (4x, 10x, and 20x) under microscope Olympus CKX53. The dataset is structured for applications in image-based granulometry and machine learning-driven soil characterization models. "