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- A horizontal datum is used to measure a location across the Earth 's surface, in latitude and longitude or another coordinate system; a vertical datum is used to measure the elevation or depth relative to a standard origin, such as mean sea level (MSL).
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What is the difference between a horizontal and a vertical datum?
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Why do we have a vertical datum?
A vertical datum is a reference system used for specifying elevation of specific points on the Earth's surface. Vertical datums broadly come in two categories: Three-dimensional datums: those are defined by using a reference ellipsoid and six geocentric parameters expressing origin, and orientation. Unlike a horizontal datum, a three ...
A horizontal datum is used to measure a location across the Earth's surface, in latitude and longitude or another coordinate system; a vertical datum is used to measure the elevation or depth relative to a standard origin, such as mean sea level (MSL).
The term datum as used here refers to a smooth surface somewhat arbitrarily defined as zero elevation, consistent with a set of surveyor's measures of distances between various stations, and differences in elevation, all reduced to a grid of latitudes, longitudes, and elevations.
A horizontal datum, like the North American Datum (NAD83) or World Geodetic System (WGS84), is used to measure position (latitude and longitude) on the Earth's surface, while a vertical datum like the North American Vertical Datum (NAVD88), is used to measure elevation or depth.
The product refers to an altitude or an elevation (orthometric height). State the vertical datum name and year in that document. Example: "Vertical coordinate information is referenced to the North American Vertical Datum of 1988 (NAVD 88)."
Oct 29, 2023 · Differences in vertical datums can range from three feet or more in the Rocky Mountains where gravitational forces are high… to a couple of inches in other areas. NAVD88 corrects many of the problems with NGVD29.
