A survey of these surfaces was last undertaken in 1993 using photogrammetry — a technique that combines overlapping images — to achieve a somewhat limited resolution of 2cm..上一次对这些巨石的表面进行的测量工作是在1993年的时候，使用了摄影测量技术---通过这种技术可以把好多张照片合并起来---其极限分辨率可以达到2厘米。
photogrammetry英语解释照相测量法英释中释nthe process of making measurements from photographs, used esp in the construction of maps from aerial photographs and also in military intelligence, medical and industrial research, etc
photogrammetry短语和解释digital photogrammetry,数字摄影测量.短语
