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Reference surface for vertical positions
geodesy, surveying, hydrography and navigation, vertical datum or altimetric datum is a reference coordinate surface used for vertical positions, such as
Vertical_datum
In aviation, reference datum height (RDH) is the height of a point, located above the intersection of the runway centre line and the threshold, through
Reference_datum_height
Vertical datum of Australia
Australian Height Datum was introduced in 1971 as the official vertical datum for Australia, and thereby serves as the benchmark to which all height measurements
Australian_Height_Datum
Reference frame for measuring location
geodetic datum or geodetic system (also: geodetic reference datum, geodetic reference system, or geodetic reference frame, or terrestrial reference frame)
Geodetic_datum
Level of water from which depths displayed on a nautical chart are measured
chart datum. Some height values on charts, such as vertical clearances under bridges or overhead wires, may be referenced to a different vertical datum, such
Chart_datum
Vertical datum used as the basis for deriving altitudes on maps
An ordnance datum (OD) is a vertical datum used by an Ordnance Survey as the basis for deriving altitudes on maps. A spot height may be expressed as above
Ordnance_datum
Vertical datum for orthometric heights
fixed the height of the primary tide gauge benchmark, referenced to the International Great Lakes Datum of 1985 local mean sea level (MSL) height value,
North American Vertical Datum of 1988
North_American_Vertical_Datum_of_1988
Elevation of a location above a standardized sea level
Height above mean sea level is a measure of a location's vertical distance (height, elevation or altitude) in reference to a vertical datum based on a
Height_above_mean_sea_level
Vertical datum in the United States
National Geodetic Vertical Datum of 1929 (NGVD29), originally known as the Sea Level Datum of 1929, is the vertical datum established for vertical control
National Geodetic Vertical Datum of 1929
National_Geodetic_Vertical_Datum_of_1929
Vertical datum
longer used as a reference point. Above mean sea level Normalnull – German height reference system derived from Amsterdam Ordnance Datum Normalhöhennull
Amsterdam_Ordnance_Datum
Measure of vertical distance
ellipsoidal height, reckoned from the surface of a reference ellipsoid, see Geodetic system, vertical datum. In aviation terminology, the terms height, altitude
Height
3-D coordinate system centered on the Earth
2010. ECEF datum transformation Archived March 22, 2007, at the Wayback Machine Notes on converting ECEF coordinates to WGS-84 datum Datum Transformations
Earth-centered, Earth-fixed coordinate system
Earth-centered,_Earth-fixed_coordinate_system
Height of a geographic location above a fixed reference point
Geodetic datum § Vertical datum). The term elevation is mainly used when referring to points on the Earth's surface, while altitude or geopotential height is
Elevation
Altitude above geoid or mean sea level
the vertical datum that approximates mean sea level. Orthometric height is one of the scientific formalizations of a layman's "height above sea level"
Orthometric_height
Height measured with respect to the underlying ground surface
(AGL, AMSL, HAE, AAT) indicate where the "zero level" or "reference altitude" – the vertical datum – is located. A pilot flying an aircraft under instrument
Height_above_ground_level
Geodetic reference frame fixed to the Eurasian Plate
compound: 2D geographic ETRS89 + EVRF2019 height (mean-tide) WGS 84 ED50 AFREF Degrees minutes seconds (DMS) Geodetic datum KMZ file, a zipped KML file Latitude
European Terrestrial Reference System 1989
European_Terrestrial_Reference_System_1989
Vertical datum used in Germany
vertical datum used in Germany. In geographical terms, NHN is the reference plane for the normal height of a topographical eminence height above mean
Normalhöhennull
Ocean shape without winds and tides
The geoid is often expressed as a geoid undulation or geoidal height above a given reference ellipsoid, which is a slightly flattened sphere whose equatorial
Geoid
Geographical reference point from which various heights are measured
2008. Height above mean sea level (AMSL) is the elevation (on the ground) or altitude (in the air) of an object, relative to a reference datum for mean
Sea_level
NAD 83 & NAVD 88 based National Geodetic Coordinate System
National Spatial Reference System (NSRS). It will replace the North American Datum of 1983 (NAD 83) and the North American Vertical Datum of 1988 (NAVD 88)
National Spatial Reference System
National_Spatial_Reference_System
Overview of GPS conversion formulas
projections all referenced to the same geodetic datum. A geographic coordinate transformation is a translation among different geodetic datums. Both geographic
Geographic coordinate conversion
Geographic_coordinate_conversion
Type of altitude above mean sea level
Geopotential heights are referenced to Earth's mean sea level, taking its best-fitting equigeopotential as a reference surface or vertical datum. In SI units, a
Geopotential_height
Surveying terminololgy
survey points with reference to a common assumed vertical datum. It is a vertical distance between survey point and adopted datum surface. Thus, it is
Reduced_level
Science of measuring the shape, orientation, and gravity of Earth
coordinate values for one or more datum points. In the case of height data, it suffices to choose one datum point — the reference benchmark, typically a tide
Geodesy
Geometric figure which approximates the Earth's shape
applications, a geodesic reference ellipsoid is the mathematical model used as foundation by spatial reference system or geodetic datum definitions. In geophysics
Earth_ellipsoid
Geodetic reference system
the large geodetic systems, such as European Datum (ED50), North American Datum (NAD), and Tokyo Datum (TD), to provide a worldwide geo-data basis Need
World_Geodetic_System
UK and Irish hydrographic vertical datum
(HAT) Land datums including Ordnance Datums Newlyn, Belfast and Poolbeg The surfaces are modelled with respect to the terrestrial reference frame used
Vertical Offshore Reference Frames
Vertical_Offshore_Reference_Frames
Measuring device
object by using the underside of the scriber as the datum. The datum may be permanently fixed or the height gauge may have provision to adjust the scale, this
Height_gauge
Registry of geographic reference systems
Dataset (also EPSG registry) is a public registry of geodetic datums, coordinate reference systems, Earth ellipsoids, coordinate transformations and related
EPSG Geodetic Parameter Dataset
EPSG_Geodetic_Parameter_Dataset
System to specify locations on Earth
longitude, and height to precisely measure actual locations on the physical earth, a geodetic datum must be used. A horizonal datum is used to precisely
Geographic_coordinate_system
Surveying technique
object of which is to establish or verify or measure the height of specified points relative to a datum. It is widely used in geodesy and cartography to measure
Levelling
difference in orthometric height between the North American Vertical Datum of 1988 (NAVD 88) and the National Geodetic Vertical Datum of 1929 (NGVD 29) for
VERTCON
Geographic coordinate specifying north-south position
latitude. The importance of specifying the reference datum may be illustrated by a simple example. On the reference ellipsoid for WGS84, the centre of the
Latitude
Vertical datum used in parts of Europe
is used as the datum, the states of former Yugoslavia use the 1900 gauge (Nadmorska visina, m/nv). In Albania (normal-orthometric height) they also refer
Metres_above_the_Adriatic
Contents A B C D E F G H I J K L M N O P Q R S T U V W X Y Z See also References External links List of aviation mnemonics Avionics Glossary of Russian
List of aviation, avionics, aerospace and aeronautical abbreviations
List_of_aviation,_avionics,_aerospace_and_aeronautical_abbreviations
Position along a vertical direction above or below a given vertical datum
direction (the plumb line direction) above or below a given vertical datum (a reference level surface, such as mean sea level). Vertical distance or vertical
Vertical_position
Geodetic Reference Frame. The goal of EUREF is to establish a unified geodetic datum for Europe (ETRS89) and a consistent network of reference stations
Regional Reference Frame Sub-Commission for Europe
Regional_Reference_Frame_Sub-Commission_for_Europe
Height of the free surface of a water body
known as gauge height or stage, is the elevation of the free surface of a sea, stream, lake or reservoir relative to a specified vertical datum. Over long
Water_level
Height in relation to a specified reference point
vertical or "up" direction, between a reference datum and a point or object. The exact definition and reference datum varies according to the context (e
Altitude
Institution responsible for surveying and mapping the national land of Japan
completed on December 24, 1891. It serves as a reference point for elevations in Japan (vertical datum). The building cannot be entered, but there is
Geospatial Information Authority of Japan
Geospatial_Information_Authority_of_Japan
Measure of how closely the shape of an object approaches that of a circle
comparing the peak height as measured by the dial gauge. Alternatively a V-shaped base can be used instead of a flat plate. Two datum points will exist
Roundness
U.S. federal surveying and mapping agency
components of the NSRS are reflected in its height system, defined by the vertical datum NAVD88. This datum is a network of orthometric heights obtained
U.S._National_Geodetic_Survey
British tidal observatory
observatory between 1915 and 1921 were used to define the reference level, Ordnance Datum Newlyn, for height measurement on the British mainland. The tide gauge
Newlyn_Tidal_Observatory
Topics referred to by the same term
RDH may refer to: Reference datum height, an aviation metric Redhill MRT station, Singapore (MRT code: RDH) Redhill railway station, Surrey, England (station
RDH
Distance from the Earth surface to a point near its center
surface height, the values defined below are based on a "general purpose" model, refined as globally precisely as possible within 5 m (16 ft) of reference ellipsoid
Earth_radius
the mountain, he sighted the dip angle which, along with the mountain's height (which he determined beforehand), he applied to the law of sines formula
Earth's_circumference
Specific measurement of liquid pressure above a vertical datum
using a standpipe piezometer by measuring the height of the water surface in the tube relative to a common datum. The hydraulic head can be used to determine
Hydraulic_head
Coordinate system for planets
datum is a generalization of geodetic datums for other planetary bodies, such as the Mars datum; it requires the specification of physical reference points
Planetary_coordinate_system
Point with known height used in surveying when levelling
vertical datum of the area, typically mean sea level. The position and height of each benchmark are shown on large-scale maps. The terms "height" and "elevation"
Benchmark_(surveying)
System of geographic location identifiers
assumed to be the altitude of the latitude-longitude point, that is its height (or negative depth) relative to the geoid (i.e. "ground elevation"). A point
Geo_URI_scheme
Vertical datum used in Switzerland
Metres above the Sea (German: Meter über Meer (m ü. M.)) is the vertical datum used in Switzerland. Both the system and the term are also used in the Principality
Metres above the Sea (Switzerland)
Metres_above_the_Sea_(Switzerland)
Setting for pressure altimeters
an altimeter to read zero when at the reference datum of a particular airfield (in practice, the reference datum is either an airfield center or a runway
Altimeter_setting
Satellite navigation system
experiments for NavIC ground reference station in Japan. ISRO is also under discussion with CNES for a NavIC ground reference station in France. ISRO is
Indian Regional Navigation Satellite System
Indian_Regional_Navigation_Satellite_System
Chinese global navigation satellite system
reached millimeter-level accuracy with post-processing from a nationwide reference station network. Predecessors included BeiDou-1 (first-generation BeiDou)
BeiDou
Cartesian geographic coordinate system
the datum ellipsoidal coordinates and height onto a flat surface of a map. The datum, along with a map projection applied to a grid of reference locations
Projected_coordinate_system
Geographic coordinate system
reference ellipsoid. They include geodetic latitude (north/south) ϕ, longitude (east/west) λ, and ellipsoidal height h (also known as geodetic height)
Geodetic_coordinates
Displacement is a result of varying topographic relief within a covered area. A datum plane, which refers to the average sea level, is essential in the displacement
Aerial photographic and satellite image interpretation
Aerial_photographic_and_satellite_image_interpretation
Change in sea level due to gravity
with periods shorter than minutes. These data are compared to the reference (or datum) level usually called mean sea level. While tides are usually the
Tide
Highest mountain in the contiguous United States
vertical datum (NGVD29) from 1929. Since then the shape of the Earth (the geoid) has been estimated more accurately. Using a new vertical datum established
Mount_Whitney
the mountain, he sighted the dip angle which, along with the mountain's height (which he calculated beforehand), he applied to the law of sines formula
History_of_geodesy
Restrictions on using GPS in China
'Topographic map non-linear confidentiality algorithm') is a geodetic datum used by the Chinese State Bureau of Surveying and Mapping, and based on
Restrictions on geographic data in China
Restrictions_on_geographic_data_in_China
Graduated rod used to measure differences between heights
instrument to determine the difference in height between points or heights of points above a vertical datum. When used for stadiametric rangefinding,
Level_staff
Delineation and characterization of Martian regions
an arbitrary zero-elevation level or "vertical datum" for mapping the surface, called areoid. The datum for Mars was defined initially in terms of a constant
Areography
Network of points with known positions used in geodesy and surveying
relative height difference between two points, can be used to determine the vertical component of control networks, particularly relative to fixed datums (such
Geodetic_control_network
Transformation method within a three-dimensional space
similarities, which is used in geodesy to compute transformations between datums. The Helmert transformation is also called seven-parameter transformation
Helmert_transformation
Largest of the Great Lakes of North America
above the datum (601.1 ft or 183.2 m). In the summer of 1985, Lake Superior reached its highest recorded level at 2.33 feet (0.71 m) above the datum. 2019
Lake_Superior
of different points. Datum surface – reference plane with respect to which RL of the other survey points is determined. The datum surface may be real or
Glossary_of_levelling_terms
American satellite-based radio navigation service
coordinate system, such as latitude and longitude using the WGS 84 geodetic datum or a country-specific system. The GPS equations can be solved by numerical
Global_Positioning_System
International standard for representation of geographic location
Prime Meridian) Vertical coordinate, i.e. height or depth (optional) Identification of coordinate reference system (CRS) (optional) The first three items
ISO_6709
Water level in a river above a reference height
stage is the water level in a river or stream with respect to a chosen reference height. It is commonly measured in units of feet. Stage is important because
Stage_(hydrology)
Dimension and shape of land surfaces
other things as "the maximum height range in a regular grid", is essentially an indication of the ruggedness or relative height of the terrain. Geomorphology
Terrain
Study of the physical properties of the Earth's gravity field
dynamic sea surface topography. These are referred to as vertical datums or height datums. For every point on Earth, the local direction of gravity or vertical
Physical_geodesy
Science of determining the positions of points and the distances and angles between them
that the Earth is flat and measure from an arbitrary point, known as a 'datum' (singular form of data). The coordinate system allows easy calculation
Surveying
Port in South Africa
Chart Datum in depth, a turning basin of 600 m in diameter and also at -18 m Port Chart Datum, 1 general cargo berth at -18 m Port Chart Datum, and 4
Port_of_Ngqura
relative to a reference frame. When representing positions relative to the Earth, it is often most convenient to represent vertical position (height or depth)
Horizontal position representation
Horizontal_position_representation
Device for measuring the change in sea level relative to a datum
is a device for measuring the change in sea level relative to a vertical datum. It is also known as a mareograph, marigraph, and sea-level recorder. When
Tide_gauge
Geopotential descriptions used by the US DoD
Parameter Dataset code as a vertical datum. The first EGM, EGM84, was defined as a part of WGS84 along with its reference ellipsoid. WGS84 combines the old
Earth_Gravitational_Model
Volcanic mountain in Georgia
The new height is defined with the WGS 84 datum. Height was determinate with 5mm accuracy. Defined height is 5053.927m.[citation needed] Mount Kazbegi
Mount_Kazbek
Mountain on Lantau Island, Hong Kong
the highest point on the island, with a height of 934 metres (3,064 ft) above the Hong Kong Principal Datum, or around 933 metres (3,061 ft) above mean
Lantau_Peak
Visual aid in aviation
ILS system must take into account the distance between eye height and ILS receiver height for various aircraft. For a typical 3 degree approach slope
Precision approach path indicator
Precision_approach_path_indicator
Measurement of the Earth using satellites
geopotential, the general shape of the geoid, and linked the world's geodetic datums. Soviet military satellites undertook geodesic missions to assist in ICBM
Satellite_geodesy
Stratovolcano in the U.S. state of Washington
410 ft (4,392 m); this value was determined in 1956, referenced to the National Geodetic Vertical Datum of 1929 (NGVD29). In 1999, the mountain summit was
Mount_Rainier
Energy held by an object because of its position relative to other objects
{m_{1}M_{2}}{r}}+K,} where K is an arbitrary constant dependent on the choice of datum from which potential is measured. Choosing the convention that K = 0 (i
Potential_energy
Broadcasting and telecommunications facility near Belfast, Northern Ireland
Datum (mean sea level) in Northern Ireland (grid reference J278727). It includes a guyed steel lattice mast which is 228.6 metres (750 ft) in height.
Black Mountain transmitting station
Black_Mountain_transmitting_station
European global navigation satellite system
for three weeks in the year you will not have satellite navigation" in reference to the proposed 18-vehicle constellation. In July 2010, the European Commission
Galileo (satellite navigation system)
Galileo_(satellite_navigation_system)
Type of natural water upwelling
head, h {\displaystyle h} at a point is defined as the height (measured relative to the datum) to which water would rise in a piezometer at that point
Seepage
Telecommunications site near Oxford, England
(425 ft) above Ordnance Datum (mean sea level) to the north east of the city of Oxford, in Oxfordshire, England (grid reference SP567105). It has a guyed
Oxford_transmitting_station
Area of London, England
the north bank of the River Thames to reach a maximum height of 14.5 metres (48 ft) Ordnance Datum. The land was historically part of the Liberties of the
Tower_Hill
2013-07-16 at the Wayback Machine. These elevations are referenced to the North American Vertical Datum of 1988 and may differ from traditional sources. A
List of Rocky Mountain passes on the continental divide
List_of_Rocky_Mountain_passes_on_the_continental_divide
Part of a turbine
{\frac {V_{3}^{2}}{2\,g}},} z2 = z (Height of draft tube) z3 = height of tail race which is referenced as datum line (=0) p2 = pressure at the outlet
Draft_tube
Seat of the Parliament of Australia
story block of the Defence Headquarters building group in Russell. With "Datum of levels Cooma Railway Survey" The Australian Capital Territory Legislative
Parliament_House,_Canberra
Procedures to find objects or persons lost at the surface of a body of water
have changed much and drift can be estimated with some confidence. Search datum is the estimated position of the target at the time the search starts, which
Water_surface_searches
adjustment from the National Geodetic Vertical Datum of 1929 (NGVD 29) to the North American Vertical Datum of 1988 (NAVD 88). For further information, please
List of California 14,000-foot summits
List_of_California_14,000-foot_summits
Topographic map of a maritime area and adjacent coastal regions
horizontal wire. All depths on charts is measured with respect to a datum/reference level. This ensures that difficult to find projections, such as masts
Nautical_chart
for the mass below the measurement point and above the reference of mean sea level or a local datum elevation. This defines the Bouguer anomaly. The free-air
Free-air_gravity_anomaly
Instrument used to measure the inclination of a surface relative to local gravity
simultaneous two-dimensional angle readings of a surface plane tangent to earth datum. Typical advantages of using two-axis MEMS inclinometers over conventional
Inclinometer
Optical instrument to verify horizontal points
crosshairs and records the reading. This is repeated for all sightings from that datum. Should the instrument be moved to another position within sighting distance
Level_(optical_instrument)
2013-07-16 at the Wayback Machine. These elevations are referenced to the North American Vertical Datum of 1988 and may differ from traditional sources. A
List of passes of the Rocky Mountains
List_of_passes_of_the_Rocky_Mountains
Rise of land masses after glacial period
satellites and has been detected by LAGEOS satellite motion. The vertical datum is a reference surface for altitude measurement and plays vital roles in many human
Post-glacial_rebound
Unit of length
the metre for official purposes, but legacy data from its 1927 geodetic datum has meant that a separate US survey mile (6336/3937 km) continues to see
Mile
REFERENCE DATUM-HEIGHT
REFERENCE DATUM-HEIGHT
Female
English
English surname transferred to forename use, TATUM means "Tate's homestead."
Boy/Male
Egyptian
Whole.
Girl/Female
Christian & English(British/American/Australian)
Spirited
Boy/Male
Muslim
Selflessness, Preference
Boy/Male
Latin
God of the harvest.
Boy/Male
Indian
Reverence, Sanctity
Male
Egyptian
, the deity of the setting sun.
Surname or Lastname
English (Essex)
English (Essex) : variant of Tatham.
Girl/Female
Indian
Selflessness, Preference
Boy/Male
Indian
Selflessness, Preference
Girl/Female
Hindu, Indian
First Preference
Girl/Female
American, Australian, British, Chinese, Christian, English, Netherlands
Light Hearted; Bringer of Joy; Cheerful; Tate's Homestead
Girl/Female
Arabic, Muslim
Preference
Girl/Female
Hindu, Indian, Marathi, Sanskrit
Reverence; Esteem
Boy/Male
Muslim
Reverence, Sanctity
Girl/Female
Muslim
Selflessness, Preference
Girl/Female
Spanish
Reference to the Incarnation.
Boy/Male
British, English
Cheerful
Girl/Female
English American
Brings joy.
Girl/Female
Latin
Lover of Satum.
REFERENCE DATUM-HEIGHT
REFERENCE DATUM-HEIGHT
Girl/Female
Danish, French, German, Hindu, Indian, Marathi, Russian, Swedish
Hope
Girl/Female
Australian, Finnish, Swedish
Happy Exclamation; Happy
Male
English
Short form of English Moses, MOSE means "drawn out."
Boy/Male
Muslim
Bright, Like glass
Boy/Male
Hindu, Indian
Graceful
Girl/Female
Tamil
Sharmista | à®·à®°à¯à®®à¯€à®¸à¯à®¤à®¾
Beauty and intelligent (Wife of yavati)
Boy/Male
Hindu
One of the kauravas
Boy/Male
Muslim
Belief in the unity of Allah
Girl/Female
Tamil
Earth
Girl/Female
Hindu, Indian
Season
REFERENCE DATUM-HEIGHT
REFERENCE DATUM-HEIGHT
REFERENCE DATUM-HEIGHT
REFERENCE DATUM-HEIGHT
REFERENCE DATUM-HEIGHT
pl.
of Datum
n.
One who, or that which, is referred to.
n.
That which refers to something; a specific direction of the attention; as, a reference in a text-book.
n.
Relation; regard; respect.
n.
One who regards with reverence.
n.
That which is preferred; the object of choice or superior favor; as, which is your preference?
n.
The process of sending any matter, for inquiry in a cause, to a master or other officer, in order that he may ascertain facts and report to the court.
n.
The act of submitting a matter in dispute to the judgment of one or more persons for decision.
n.
A work, or a passage in a work, to which one is referred.
n.
The act of referring, or the state of being referred; as, reference to a chart for guidance.
n.
Appeal.
n.
A yielding of judgment or preference from respect to the wishes or opinion of another; submission in opinion; regard; respect; complaisance.
n. pl.
See Datum.
v. t.
To regard or treat with reverence; to regard with respect and affection mingled with fear; to venerate.
n.
The act of Preferring, or the state of being preferred; the setting of one thing before another; precedence; higher estimation; predilection; choice; also, the power or opportunity of choosing; as, to give him his preference.
n.
That which deserves or exacts manifestations of reverence; reverend character; dignity; state.
imp. & p. p.
of Reverence
n.
One of whom inquires can be made as to the integrity, capacity, and the like, of another.
n.
The quantities or relations which are assumed to be given in any problem.
n.
Something given or admitted; a fact or principle granted; that upon which an inference or an argument is based; -- used chiefly in the plural.