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The National Geodetic Survey (NGS) is a United States federal agency based in Washington, D.C. that defines and manages a national coordinate system, providing the foundation for transportation and communication, mapping and charting, and a large number of science and engineering applications.
The North American-Pacific Geopotential Datum of 2022 (NAPGD2022) is a new geodetic datum set to be produced by the U.S. National Geodetic Survey in 2025 or 2026 to improve the National Spatial Reference System (NSRS).
The National Geodetic Survey has announced a modernization of the National Spatial Reference System, and a replacement of the state plane coordinate system will be part of the modernization. The number of zones will be substantially higher than the 1983 system.
Benchmarking, also known as benchmark hunting, [1] is a hobby activity in which participants find benchmarks (also known as survey markers or geodetic control points). The term "benchmark" is used only to refer to survey markers that designate a certain elevation , but hobbyists often use the term benchmarks to include triangulation stations or ...
Still in 2022 ITRF2020 was released, yet GPS was only using G2139 in its antennas, which was aligned to ITRF2014 (IGb14) (though at epoch 2016.0, not reference epoch 2010.0). [9] On 7 January 2024 move to IGS20 happened, so WGS 84 is now aligned with ITRF2020, including PSD (post-seismic deformation), also called G2296.
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). Mean elevation data is not available for the other U.S. territories.
But a few states have established by law that they must remain available in survey feet as well. In October 2019, the U.S. National Geodetic Survey and the National Institute of Standards and Technology announced their joint intent to retire the U.S. survey foot, with effect from the end of 2022. The link in U.S. Customary units is thereafter ...
Counties and county-equivalents of the United States of America.. The following table ranks the 50 highest United States counties or county-equivalents [a] by mean elevation. [b] This list uses the "mean of extremes" elevation which is the arithmetic mean of the highest and lowest elevations.