Controlled photogrammetry system for determination of volume and surface features in soils

Quantitative and qualitative determination of total volume and surface features of a soil specimen is important in geotechnical engineering. Available methods suffer from a variety of shortcomings such as sample disturbance, equipment calibration, and lack of precision. The Controlled Photogrammetry System (CPS) is based on Structure-from-Motion (SfM) to capture a series of photographs and transform the images into a referenced three-dimensional model. • This paper develops the Controlled Photogrammetry System. • This paper describes the design and operation of the Controlled Photogrammetry System. • This paper presents data processing and test results for a sand and clay.