Soil bulk density (D_b), the ratio of soil solid mass to bulk soil volume, is an important but difficult soil property to measure. Existing methods are either expensive, time consuming, or destructive to the sample. The goal of this research was to investigate the utility of photogrammetry for measuring D_b. Photogrammetry is the determination of shape and volume from multiple overlapping photos. Photos of soil peds placed on a 3D‐printed turntable were obtained using two mobile devices. Photogrammetry‐measured volume and D_b were compared with volume and D_b measured using the clod and 3D laser‐scanning methods. No significant differences between D_b measured by any method were found. No statistical difference between cameras types was found. We conclude that photogrammetry is a useful method for measuring D_b. Measuring D_b using photogrammetry was much easier than the other methods and was less expensive and faster than 3D laser scanning.

中文翻译：

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使用移动设备摄影测量法快速测量堆积密度

土壤容重（D _b），即土壤固体质量与体积土体积之比，是重要但难以测量的土壤性质。现有方法要么昂贵，耗时，要么对样品具有破坏性。这项研究的目的是探讨摄影的实用工具，用于测量d _b。摄影测量是从多张重叠的照片中确定形状和体积。使用两个移动设备获得了放在3D打印转盘上的土壤小便的照片。摄影测量体积和d _b以体积和进行比较d _b使用土块和3D激光扫描的方法测定。D _b之间无显着差异发现用任何方法测量。没有发现摄像机类型之间的统计差异。我们得出结论，摄影测量法是一种用于测量D _b的有用方法。使用摄影测量法测量D _b比其他方法容易得多，并且比3D激光扫描便宜且速度更快。