Height above mean sea level
http://en.wikipedia.org/wiki/Height_above_mean_sea_level

Sea Level Datum of 1929
http://en.wikipedia.org/wiki/Sea_Level_Datum_of_1929

Number one City Datum
http://commons.wikimedia.org/wiki/File:Chicago_City_Datum.jpg#file

Israel Seal Level
http://en.wikipedia.org/wiki/File:Israel_Sea_Level_BW_1.JPG

Posted on Friday, March 22, 2013 in Info of the Week by Howard Ehmke | Add Comment

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