测量员从海岸向内陆行进数千英里，每增加几英尺就停下来测量海拔，每增加一英尺就用两根杆子做标记。
Surveyors marched inland from the coast for thousands of miles, stopping at increments of as little as a few feet to measure their elevation, and marking each increment with two poles.
图中的颜色显示了沿着海岸地区，海拔高度一米或不到一米的地区(黄褐色)，海拔6米或以下的地区(黄色)与海水有效地连接在一起。
S.The colors indicate areas along the coast that are elevations of 1 meter or less (russet) or 6 meters or less (yellow) and have connectivity to the sea.
图中的颜色显示了沿着海岸地区，海拔高度一米或不到一米的地区（黄褐色)，海拔6米或以下的地区（黄色）与海水有效地连接在一起。
S. The colors indicate areas along the coast that are elevations of 1 meter or less (russet) or 6 meters or less (yellow) and have connectivity to the sea.
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