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大沽零点是1902年天津建港之初,两名英国船长Smyth和Fergvson在海河设置验潮站观测潮位的水尺零点。此后,大沽零点逐渐扩大其作用范围,不仅成为海河各验潮站的潮位零点、海图深度基准面和潮汐表的潮高基准面,还被陆图用作高程基准面。至1956年,以大沽零点为高程基准面起算的地物高度已扩展至包括内陆在内的华北广大地区,成为我国有影响的三个高程零点(大沽零点,吴淞零点,珠江零点)之一。
At the beginning of the founding of Tianjin in 1902, two Taiwanese captains Smyth and Fergvson set the zero mark of the tide gauge for the tide gauge at Haihe. Since then, the Dagu zero gradually expand its scope, not only to become the tide of the Haihe tide zero points, chart depth and tidal tables tidal height of the tide surface, but also by the land map as elevation datum. By 1956, the elevation of the elevations at the base of the elevation of the Dagu zero point had been extended to cover vast areas in North China, including inland areas, and became the three zero points of impact in China (Dagu zero, Wusong zero and Zhujiang zero) one.