Mean Sea Level
Mean sea level is the average level of the ocean surface halfway between the highest and lowest levels recorded.
Mean sea level The average height of the surface of the sea for all stages of tide, used as a reference surface from which elevations are measured.
Mean Sea Level
The average level of the ocean's surface, as measured by the level halfway between mean high and low tide. Used as a standard in determining land elevation or sea depths.
mean sea level
the mean surface-water level that was determined by averaging heights at all stages of the tide over a 19-year period (often used as a reference for general leveling operations)
meas ...
Mean Sea Level as the starting point for height measurements using a technique known as geodetic leveling ...
Mean Sea Level
To say that a certain feature is a particular numeric distance high naturally assumes that measurement originated at a fixed reference point.
Mean sea level (MSL) - The numerical value representing the level of the sea surface at a particular location, ...
1=local mean sea level
2=National Geodetic Vertical
Datum 1929 (NGVD 29)
3=North American Vertical
Datum 1988 (NAVD 88) ...
6 three-dimensional shape of the Earth defined by the surface where gravity has the value associated with Mean Sea Level.
mean sea level Tidal datum that is the arithmetic mean of the hourly water elevations observed over a specific 19-year Metonic cycle (National Tidal Datum Epoch).
True altitude is the elevation above mean sea level. In UK aviation radiotelephony usage, the vertical distance of a level, a point or an object considered as a point, measured from mean sea level; ...
In the oceans this shape almost coincides with mean sea level (see below). Geodesy, the science of the Earth's shape, tells us where the geoidal surfaces depart from the ellipsoid, which, worldwide, tend to range between about -100 to +70 m.
The elevation values are given in meters above mean sea level with ocean areas masked as -9999 (representing no data). Inland water bodies carry representative surface elevations. Vertical accuracies of the elevation values vary with the data source.
The next step was determination of present mean sea level (MSL) in the Fehmarnbelt and establishment of a project-specific height system with the zero-level as close as possible to the actual MSL of Fehmarnbelt.
The Earth's Geoid is regarded as being equal to Mean Sea Level. Over open oceans the Geoid and Mean Sea Level are approximately the same, but in continental areas they can differ significantly.
A vertical datum in which zero height is defined by a particular tidal surface, often mean sea level. Examples of tidal surfaces include mean sea level, mean low water springs, and mean lower low water.
Traditionally, a vertical geodetic datum defines zero height as the mean sea level at a particular location or set of locations; other heights are measured relative to a level surface passing through this point.
It is that equipotential surface (surface of fixed potential value) which coincides on average with mean sea level.
Contour A line connecting points of equal value. Often in reference to a horizontal datum such as mean sea level.
Conversion 1. The translation of data from one format to another (e.g. TRIM to DXF; a map to digital files).
Contour - An imaginary outline of points on the ground which are at the same altitude relative to mean sea level.
Contour Line - A line on a map or chart that connects to points which are at the same elevation.
Contours are the imaginary lines that join points of equal elevation on the surface of land above or below a reference surface such as mean sea level. The map includes symbols that represent features such as streets, buildings, streams and forests.
An imaginary line on the ground, all points of which are at the same elevation above or below a specified datum surface, usually mean sea level.
Contour Interval ...
If this were true, the mean sea level would coincide with the ellipsoid's surface. However, there are mountains and trenches causing variations in local height. The geoid accounts for this variation.
It most often refers to either a horizontal standard, such as a particular spheroid for referencing coordinate positions, or it refers to a vertical datum, such as mean sea level, from which elevations are referenced.
Another way to conceptualize the physical shape of the surface is to imagine blowing up a giant balloon such that it "best fits" the actual shape of the earth (termed the geoid) most often aligning with mean sea level.
Elevations are in meters or feet referenced to mean sea level. USNMAS U.S. National Map Accuracy Standards: Accuracy standards for published maps in English units defining measurements for horizontal and vertical accuracy.
For other uses of the word, see Elevation In geography, the elevation of a geographic location is its height above mean sea level (or possibly some other fixed point). ...
The vertical distance between mean sea level and a point or object on, above or below Earth's surface.
Eolian:
A term used in reference to the wind. Eolian materials or structures are deposited by or created by the wind.
Eon: ...
Often in reference to a horizontal datum such as mean sea level. Control point A ground location with surveyed positional coordinates, used for correcting distortions in aerial photographs. Conversion 1.
 See also: Surface, Information, Map, Elevation, Mapping
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