One result of replacing NAD27 with NAD83 was that the latitude and longitudeĬoordinates for any given position in North America shifted slightly (Tableġ). Of the shift (in meters) in latitude and longitudeĪs a result of changing from NAD27 to NAD83. The 1983 data removed distortions associated with NAD27.Īlso, NAD83 fits the size, shape and center-of-mass location of the earth more NAD83 is based on the adjustment of 250,000 points, including 600 satelliteĭoppler stations. Years of work, the National Geodetic Survey (part of the National Oceanic andĪtmospheric Administration) announced it had developed a new North Americanĭatum, known as NAD83 (although it was not scheduled to be implemented untilġ986). However,Īdvances in space satellite and land-based technology have led to a "newĪnd improved" set of "horizontal control points." After several had been based on the North American Datum of 1927, or NAD27. To which horizontal positions in the United States, Canada, Mexico and CentralĪmerica are accurately surveyed and referenced. The "North American datum" is a plane (or more precisely, a surface) Map user who may have used the Maryland coordinate system in the past to understand This short summary is aimed at helping the In recent years, both the latitude-longitude system and the State coordinate Perhaps the most common is the use of latitude and longitude,īut latitude and longitude pose complications when computations are involved.Ī remedy to such complications is the development of State Plane Coordinate Various types of coordinate systems are used to designate a location in some
To some standard, or fixed, position in the east-west direction and a position
The location of some point is in terms of two coordinates, generally with reference Perhaps the easiest and most objective way to specify Map users often have the need to refer to the location of some point on the Earthquakes, Sinkholes and Other GeohazardsĪ User's Guide to the Maryland Coordinate System.
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