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GDA94
The Geocentric Datum of Australia 1994 (GDA94) is a geodetic datum covering the Australian continent. Details of this datum are provided by the GDA94 Technical Manual. History The GDA94 datum was formalized in 1994, replacing the previous datums which were being used in Australia at the time, the Australian Geodetic Datum 1966 (AGD66) and the Australian Geodetic Datum 1984 (AGD84). Prior to 1966, maps in Australia were produced in miles using the Australian National Grid. Map Grid of Australia 1994 At the same time as GDA94 was defined, a Universal Transverse Mercator coordinate system called the Map Grid of Australia 1994 (MGA94) was also defined to replace the existing Australian Map Grid (AMG). This new map grid used the GDA94 datum and the GRS80 The Geodetic Reference System 1980 (GRS 80) is a geodetic reference system consisting of a global reference ellipsoid and a normal gravity model. Background Geodesy is the scientific discipline that deals with the measurement an ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Geodetic Datum
A geodetic datum or geodetic system (also: geodetic reference datum, geodetic reference system, or geodetic reference frame) is a global datum reference or reference frame for precisely representing the position of locations on Earth or other planetary bodies by means of '' geodetic coordinates''. DatumsThe plural is not "data" in this case are crucial to any technology or technique based on spatial location, including geodesy, navigation, surveying, geographic information systems, remote sensing, and cartography. 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). Since the rise of the global positioning system (GPS), the ellipsoid and datum WGS 84 it uses has supplanted most others in many applications. The WGS 84 is intended for global use, unlike most earlier datums. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Geodetic Datums
A geodetic datum or geodetic system (also: geodetic reference datum, geodetic reference system, or geodetic reference frame) is a global datum reference or reference frame for precisely representing the position of locations on Earth or other planetary bodies by means of ''geodetic coordinates''. DatumsThe plural is not "data" in this case are crucial to any technology or technique based on spatial location, including geodesy, navigation, surveying, geographic information systems, remote sensing, and cartography. 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). Since the rise of the global positioning system (GPS), the ellipsoid and datum WGS 84 it uses has supplanted most others in many applications. The WGS 84 is intended for global use, unlike most earlier datums. Before ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
GRS 80
The Geodetic Reference System 1980 (GRS 80) is a geodetic reference system consisting of a global reference ellipsoid and a normal gravity model. Background Geodesy is the scientific discipline that deals with the measurement and representation of the earth, its gravitational field and geodynamic phenomena (polar motion, earth tides, and crustal motion) in three-dimensional, time-varying space. The geoid is essentially the figure of the Earth abstracted from its topographic features. It is an idealized equilibrium surface of sea water, the mean sea level surface in the absence of currents, air pressure variations etc. and continued under the continental masses. The geoid, unlike the ellipsoid, is irregular and too complicated to serve as the computational surface on which to solve geometrical problems like point positioning. The geometrical separation between it and the reference ellipsoid is called the geoidal undulation, or more usually the geoid-ellipsoid separation, ''N''. I ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
World Geodetic System
The World Geodetic System (WGS) is a standard used in cartography, geodesy, and satellite navigation including GPS. The current version, WGS 84, defines an Earth-centered, Earth-fixed coordinate system and a geodetic datum, and also describes the associated Earth Gravitational Model (EGM) and World Magnetic Model (WMM). The standard is published and maintained by the United States National Geospatial-Intelligence Agency. Definition The coordinate origin of WGS 84 is meant to be located at the Earth's center of mass; the uncertainty is believed to be less than . The WGS 84 meridian of zero longitude is the IERS Reference Meridian,EUROCONTROL, European Organisation for the Safety of Air Navigation and Institute of Geodesy and Navigation, IfEN: WGS 84 Implementation Manual, p. 13. 1998 5.3 Minute of arc, arc seconds or east of the Greenwich meridian at the latitude of the Royal Observatory, Greenwich, Royal Observatory. (This is related to the fact that the loc ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Intergovernmental Committee On Surveying And Mapping
ANZLIC, or The Spatial Information Council, is the peak intergovernmental organisation providing leadership in the collection, management and use of spatial information in Australia and New Zealand. It supports the establishment of a Spatial Data Infrastructure in the region and has published geospatial metadata standards. ANZLIC started in 1986 as the ''Australian Land Information Council'' (''ALIC'') and it became the ''Australia and New Zealand Land Information Council'' (''ANZLIC'') in 1991. ANZLIC, now refers to itself as the Spatial Information Council. Warwick Watkins was the longest serving Chairman of ANZLIC, 2000–2011, until he was dismissed from the NSW Public Service. ANZLIC chair appointments are typically only for two years, but Watkins held the chair for more than eleven. Drew Clarke immediately replaced Watkins as Chair of ANZLIC and remained as Chair until mid 2015. Watkins was found guilty of corruption by the New South Wales Independent Commission Agains ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Geography Of Australia
The geography of Australia encompasses a wide variety of biogeographic regions being the world's smallest continent, while comprising the territory of the sixth-largest country in the world. The population of Australia is concentrated along the eastern and south-eastern coasts. The geography of the continent is extremely diverse, ranging from the snow-capped mountains of the Australian Alps and Tasmania to large deserts, tropical and temperate forests, grasslands, heathlands and woodlands. The countries that govern nearby regions include Indonesia, East Timor, and Papua New Guinea to the north; the Solomon Islands, Vanuatu, and the French dependency of New Caledonia to the east; and New Zealand to the southeast. Physical geography Australia is a continent and an island located in Oceania between the Indian Ocean and the South Pacific Ocean. It shares its name with the country that claims control over it. Properly called the Commonwealth of Australia, its territory cons ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
1994 In Australia
The following lists events that happened during 1994 in Australia. Incumbents *Monarch – Elizabeth II *Governor-General – Bill Hayden *Prime Minister – Paul Keating **Deputy Prime Minister – Brian Howe ** Opposition Leader – John Hewson (until 23 May), then Alexander Downer * Chief Justice – Sir Anthony Mason State and territory leaders *Premier of New South Wales – John Fahey ** Opposition Leader – Bob Carr *Premier of Queensland – Wayne Goss ** Opposition Leader – Rob Borbidge *Premier of South Australia – Dean Brown ** Opposition Leader – Lynn Arnold (until 5 November), then Mike Rann *Premier of Tasmania – Ray Groom ** Opposition Leader – Michael Field *Premier of Victoria – Jeff Kennett ** Opposition Leader – John Brumby *Premier of Western Australia – Richard Court ** Opposition Leader – Carmen Lawrence (until 7 February), then Ian Taylor (until 12 October), then Jim McGinty *Chief Minister of the Australian Capital Terri ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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