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NAVD 88 was established in 1991 by the minimum-constraint adjustment of geodetic leveling observations in Canada, the United States, and Mexico. It held fixed the height of the primary tide gauge benchmark , referenced to the International Great Lakes Datum of 1985 local mean sea level (MSL) height value, at Rimouski , Quebec , Canada .
North American Datum. The North American Datum (NAD) is the horizontal datum now used to define the geodetic network in North America. A datum is a formal description of the shape of the Earth along with an "anchor" point for the coordinate system. In surveying, cartography, and land-use planning, two North American Datums are in use for making ...
December 16, 1975 [1] The Thunderbird Archaeological District, near Limeton, Virginia, is an archaeological district described as consisting of "three sites—Thunderbird Site, the Fifty Site, and the Fifty Bog—which provide a stratified cultural sequence spanning Paleo-Indian cultures through the end of Early Archaic times with scattered ...
September 15, 1992 [2] Blandy Experimental Farm Historic District is a national historic district located adjacent to The Tuleyries at Boyce, Clarke County, Virginia. It encompasses 15 contributing buildings, 1 contributing site, and 1 contributing structure. They include a large, two-story, brick slave's quarters built about 1825; a stone and ...
At 9:00 a.m., Brigadier General (Brevet Major General) Wesley Merritt reinforced the Union picket line and ordered Brigadier General Thomas Devin to send out strong combat patrols from his camp at J. Boisseau's farm north of Dinwiddie Court House to scout Confederate positions covering White Oak Road [84] [87] [88] Patrols moving up Crump Road ...
Although created as a geocentric datum which originates at the center of the Earth, more recent models of the Earth have shown the origin to be 2.2 m off the center of the Earth. Elevation is recorded against the North American Vertical Datum 1988 (NAVD 88), which uses as its origin point Father Point, in Quebec, Canada.
Bellevue Rural Historic District is a national historic district located near Forest, Bedford County, Virginia. It encompasses seven contributing buildings, five contributing sites, and one contributing structure. They are associated with the Bellevue School for Boys, Trivium, Brook Hill Farm, and Glenn Mary Farm properties.
Designated VLR. April 17, 1991, June 8, 2006 [2] Kentland Farm Historic and Archeological District is a historic home, archaeological site, and national historic district located near Blacksburg, Montgomery County, Virginia. The district encompasses a complex of 19th century agricultural outbuildings associated with a Federal and Greek Revival ...