虽然她皓首穷经地埋首于英国四十万分之一比例尺的全国地形测量地图，追寻每一条等高线，对她的研究目标来说，她仍觉得这份地图算是「粗糙的工具」。
Though she spent much of the time with her nose in one-inch Ordnance Survey maps, tracking the contour lines, she found them a “coarse instrument” for her purpose.
一定要注意区分美术画的线条和准确测量的等高线线条的不同。
Care must be taken to distinguish artistically drawn form lines from accurately surveyed contour lines.
更糟糕的是，传统的土地测量方法制作的等高线平面只能描述大概的地形而无法描述该地区大量的岩石和灌木丛。
To make matters worse, conventional land surveying produces contour plans that describe the topography only with no ability to describe the plethora of rocks and bush.
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