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1 day ago · All topographic elevations are adjusted to the North American Vertical Datum of 1988 (NAVD 88). All geographic coordinates are adjusted to the World Geodetic System of 1984 (WGS 84) . The mean elevation for each state, the District of Columbia, and Puerto Rico are accurate to the nearest 100 feet (30 m).
horizontal: north american datum of 1927 horizontal: north american datum of 1983/2011 vertical: national geodetic vertical datum of 1929 vertical: north american vertical datum of 1988 (12) hor. control: ayres associates 1995 hor. control: sewrpc 2018 ver. control: ver. control: sewrpc 2019 northing: 223,423.40 usft northing: 223,432.70 usft
4 days ago · The professional purposes of the project were to connect Mount Washington to the North American Vertical Datum of 1988 (NAVD 88) and make the benchmark data available online from the National Geodic Survey (NGS).
5 days ago · The standard in the USA is the North American Vertical Datum of 1988 (NAVD 88). Many GPS use the WGS84 Ellipsoid as the vertical datum. The WGS84 Ellipsoid is from the same organization as the WGS84 coordinate system, but not part of WGS84.
5 days ago · A wide array of coordinate reference systems, such as WGS 84 or NAD83 (2011) geographic systems, thousands of projected systems (like UTM zones), as well as vertical systems like NAVD88 are supported. One of the key features of SpatialReference.org is its support for EPSG codes.
3 days ago · Elevations are reported in feet above the National Geodetic Vertical Datum of 1929 (NGVD29). Prior to 1973, the datum was the Sea Level Datum of 1929, commonly referred to as mean sea level (MSL). See Vertical Datum and Floodplain Information below for additional details.
3 days ago · These images are aligned with the Universal Transverse Mercator (UTM) coordinate system and referenced to the North American Datum of 1983 (NAD 83).
