A detailed study has been made of the prints using photogrammetry，a technique for obtaining measurements through photographs，which created a drawing showing all the curves and contours of the prints.
(被动语态)
已经使用照相测量法(一种通过照相获得测量数据的技术)对这些脚印进行了一项详细的研究，这种方法产生了一张显示脚印所有曲线和轮廓的照片。
分句1. A detailed study has been made of the prints using photogrammetry
分句2. a technique for obtaining measurements through photographs
分句3. which created a drawing showing all the curves and contours of the prints
2和3并列
1和2，3嵌套
1是主干，2和3都是1 : the prints using photogrammetry的定语：2是插入语，3是定语从句。
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