USGS scientist Daniel Hoover mapping the beach at Santa Cruz with a GPS-equipped backpack unit.
Why don't the elevations on your maps agree with those provided by my GPS system? Which are correct?
Elevations provided by your GPS receiver might disagree with elevations on a USGS map, but they could both be correct if they reference different vertical and/or horizontal datums.
The default horizontal datum setting on most GPS receivers is the World Geodetic System of 1984 (WGS84) and the elevations are based on the NAD83 ellipsoid.
USGS topographic maps published after 2009 are georeferenced to the North American Datum of 1983 (NAD83; which is virtually equivalent to WGS84 at topographic map scales), but uses the North American Vertical Datum of 1988 (NAVD88) for vertical control of elevation. USGS topographic maps published before 2009 are typically referenced to the North American Datum of 1927 (NAD27) and the elevations are based on mean sea level.
The use of different datums can create horizontal shifts of tens of meters and vertical shifts of hundreds of meters.
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Mapping the beach with a GPS-equipped backpack unit.
USGS scientist Daniel Hoover mapping the beach at Santa Cruz with a GPS-equipped backpack unit.
Learning How to Navigate With GPS
USGS SIS employees led a GPS class in the Kid Zone at the Longmont Airshow.
USGS SIS employees led a GPS class in the Kid Zone at the Longmont Airshow.
Learning How to Navigate With GPS
USGS SIS employees led a GPS class in the Kid Zone at the Longmont Airshow.
USGS SIS employees led a GPS class in the Kid Zone at the Longmont Airshow.
Related Content
How large is the North American Datum of 1927 (NAD 27) to NAD 83 shift?
Within the conterminous 48 states, the North American Datum of 1927 (NAD 27) to the North American Datum of 1983 (NAD 83) shift of the latitude/longitude graticule (lines showing parallels of latitude and meridians of longitude for the earth) is in the range of 10-100 ground meters. Changes to UTM values are generally larger, around 200 meters, and changes for other coordinate systems are...
How are different map projections used?
The method used to portray a part of the spherical Earth on a flat surface, whether a paper map or a computer screen, is called a map projection. No flat map can rival a globe in truly representing the surface of the entire Earth, so every flat map misrepresents the surface of the Earth in some way. A flat map can show one or more--but never all--of the following: True directions True distances...
What is a digital elevation model (DEM)?
A Digital Elevation Model (DEM) is a representation of the bare ground (bare earth) topographic surface of the Earth excluding trees, buildings, and any other surface objects. DEMs are created from a variety of sources. USGS DEMs used to be derived primarily from topographic maps . Those are being systematically replaced with DEMs derived from high-resolution lidar and IfSAR (Alaska only) data...
What is the projection, horizontal datum, vertical datum, and resolution for a USGS digital elevation model (DEM)?
Projection : 3DEP DEMS have different projections/coordinate systems depending on the product: 1/3-, 1-, and 2-arc-second (also the discontinued 1/9-arc-second) DEMs are not projected. They are all in geographic coordinates (latitude/longitude). 5-meter DEMs (Alaska only) are Alaska Albers Equal Area. 1-meter DEMs are in Universal Transverse Mercator (UTM). Original Product Resolution (OPR) DEMs...
Why are USGS historical topographic maps referenced to outdated datums?
In the United States only three horizontal datums are commonly used: The North American Datum of 1927 ( NAD27 ) uses a starting point at a base station in Meades Ranch, Kansas and the Clarke Ellipsoid to calculate the shape of the Earth. The North American Datum of 1983 ( NAD83 ) was developed when satellites enabled a better model. NAD83 coordinates can be hundreds of meters away from coordinates...
Mapping the beach with a GPS-equipped backpack unit.
USGS scientist Daniel Hoover mapping the beach at Santa Cruz with a GPS-equipped backpack unit.
USGS scientist Daniel Hoover mapping the beach at Santa Cruz with a GPS-equipped backpack unit.
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USGS SIS employees led a GPS class in the Kid Zone at the Longmont Airshow.
USGS SIS employees led a GPS class in the Kid Zone at the Longmont Airshow.
Learning How to Navigate With GPS
USGS SIS employees led a GPS class in the Kid Zone at the Longmont Airshow.
USGS SIS employees led a GPS class in the Kid Zone at the Longmont Airshow.