North American Vertical Datum of 1988

海平面基準其後被北美垂直測量基準（英语：North American Vertical Datum of 1988）（英語：North American Vertical Datum of 1988、NAVD88）取代。 平均海平面用26個驗潮儀上測量：美國21個，加

Level Datum of 1929） to North American Vertical Datum of 1988（英语：North American Vertical Datum of 1988）. Maroon Peak, Colorado. Peakbagger.com. [January

[2011-10-24]. （原始内容存档于2011-10-15）.  Elevation adjusted to North American Vertical Datum of 1988. Median Annual Household Income. The Henry J. Kaiser Family

[2011-10-24]. （原始内容存档于2012-07-22）.  Elevation adjusted to North American Vertical Datum of 1988. Median Annual Household Income. The US Census Bureau. [2016-12-09]

[2016-01-19]. （原始内容存档于2013-11-09）.  Elevation adjusted to North American Vertical Datum of 1988. Median Annual Household Income. The Henry J. Kaiser Family