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Amsterdam Ordnance Datum
Amsterdam Ordnance Datum or ' (NAP) is a vertical datum in use in large parts of Western Europe. Originally created for use in the Netherlands, its height was used by Prussia in 1879 for defining ', and in 1955 by other European countries. In the 1990s, it was used as the reference level for the United European leveling Network (UELN) which in turn led to the European Vertical Reference System (EVRS). Mayor Johannes Hudde of Amsterdam in a way came up with the idea after he expanded the sea dike after a flood in Amsterdam in 1675. Of course a dike should be storm-resistant to protect a city against flooding, and in this case a margin of "9 feet and 5 inches" (2.67 m - margin is defined in Amsterdam feet) was deemed enough to cope with rising water. So he measured the water level of the adjacent sea arm, ' and compared it with the water level in the canals within the city itself. He found that the water level at an average summer flood in the sea arm (when the water level re ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Vertical Datum
In geodesy, surveying, hydrography and navigation, vertical datum or altimetric datum, is a reference coordinate surface used for vertical positions, such as the elevations of Earth-bound features (terrain, bathymetry, water level, and built structures) and altitudes of satellite orbits and in aviation. In planetary science, vertical datums are also known as zero-elevation surface or zero-level reference. Commonly adopted criteria for a vertical datum include the following approaches: * Tides, based on sea level when specific conditions occur, such as NOAA's National Geodetic Survey-produced Tidal Datums; * Gravimetric, based on a geoid; or geometric, based on the same Earth ellipsoids that are used in computing a horizontal datum, such as NOAA's planned gravimetric and Global Navigation Satellite Systems (GNSS)-based Datum of 2022 set to be released that year by the National Geodetic Survey. Prominent vertical datums in use by professionals include the National Geodetic Ver ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
IJ (Amsterdam)
The IJ (; sometimes shown on old maps as ''Y'' or ''Ye'') is a body of water, formerly a bay, in the Dutch province of North Holland. It is known for being Amsterdam's waterfront. Etymology The name IJ is derived from the West Frisian word ''ie'', alternatively spelled ''ije'', meaning water and cognate with the English word ea. The name consists of the digraph ij which is capitalized as IJ. Geography Today, the IJ is divided into two parts: * To the west of the Oranjesluizen (Oranje Locks), the Binnen-IJ (inner IJ), or Afgesloten-IJ (closed IJ), is directly connected to the North Sea Canal, where the port of IJmuiden and the North Sea can be reached. * To the east of the Oranjesluizen, the Buiten-IJ (outer IJ) is an extension of the IJmeer which is itself an extension of the Markermeer. The IJ is connected to the North Sea to the west and the IJmeer to the east by a set of locks. History There are several theories about the origins of the IJ. Perhaps it began a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Geography Of The Netherlands
The geography of the European Netherlands is unusual in that much of its land has been reclaimed from the sea and is below sea level, protected by dikes. It is a small country with a total area of and ranked 131st. With a population of 17.4 million and density of makes it the second most densely populated member of the European Union after Malta, and the 12th most densely populated country in the world, behind only three countries with a population over 16 million. Consequently, the Netherlands is highly urbanized. Statistics Geographic coordinates: The Dutch RD coordinate system (''Rijksdriehoeksmeting'') is also in common use. For transformation to and from geographical coordinates there is an official procedure RDNAPTRANS™ and approximate as well as precise tools available. The west–east coordinate is between 0 and 280 km, and the south–north coordinate between 300 and 620 km. The central point is the ''Onze-Lieve-Vrouwentoren'' (Our Lady's Tower) in ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Normalhöhennull
' ("standard elevation zero") or NHN is a vertical datum used in Germany. In geographical terms, NHN is the reference plane for the normal height of a topographical eminence height above mean sea level used in the 1932 German Mean Height Reference System ('). The plane is in the shape of a quasi-geoid. The reference height is a geodetic, fixed point on the New Church of St. Alexander at Wallenhorst in the German state of Lower Saxony. The geopotential height of this point was calculated in 1986 as part of the United European Levelling Network (UELN), based on the Amsterdam Ordnance Datum. Definition The NHN plane is a theoretical reference plane. It is derived by deducting normal heights from the normal plumb line. The difference between the resulting quasi-geoid and the reference ellipsoid is called the height anomaly or quasi-geoid height. Change-over from NN to NHN Since 1 January 2000 the whole of Germany has changed its height system over to normal heights bas ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Above Mean Sea Level
Height above mean sea level is a measure of the vertical distance ( height, elevation or altitude) of a location in reference to a historic mean sea level taken as a vertical datum. In geodesy, it is formalized as '' orthometric heights''. The combination of unit of measurement and the physical quantity (height) is called " metres above mean sea level" in the metric system, while in United States customary and imperial units it would be called " feet above mean sea level". Mean sea levels are affected by climate change and other factors and change over time. For this and other reasons, recorded measurements of elevation above sea level at a reference time in history might differ from the actual elevation of a given location over sea level at a given moment. Uses Metres above sea level is the standard measurement of the elevation or altitude of: * Geographic locations such as towns, mountains and other landmarks. * The top of buildings and other structures. * Flying o ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Stopera
The Stopera is a building complex in Amsterdam, Netherlands, housing both the city hall of Amsterdam and the Dutch National Opera and Ballet, the principal opera house in Amsterdam that is home of Dutch National Opera, Dutch National Ballet and Holland Symfonia. The building was designed by Wilhelm Holzbauer and Cees Dam. The name is an abbreviation of the protest slogan "Stop the Opera" and not a portmanteau of ''"st"adhuis'' (Dutch: "city hall") and ''"opera"'' as is often claimed. Because the word 'Stopera' was a name for the protests against the building, the theater has never used this name in their communication. The Stopera is located in the center of Amsterdam at a bend of the Amstel River between Waterlooplein Square and the Zwanenburgwal Canal, on a plot of land called ''Vlooienburg'', which was reclaimed in the 16th century. The opera house building is shaped like a huge, massive block, with a curved front facing the city. Its facade is covered in a red-orange bri ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dam (Amsterdam)
Dam Square or the Dam () is a town square in Amsterdam, the capital of the Netherlands. Its notable buildings and frequent events make it one of the best-known and most important locations in the city and the country. Location and description Dam Square lies in the historical center of Amsterdam, approximately south of the main transportation hub, Centraal Station, at the original location of the dam in the river Amstel. It is roughly rectangular in shape, stretching about from west to east and about from north to south. It links the streets Damrak and Rokin, which run along the original course of the Amstel River from Centraal Station to Muntplein (Mint Square) and the Munttoren (Mint Tower). The Dam also marks the endpoint of the other well-traveled streets Nieuwendijk, Kalverstraat and Damstraat. A short distance beyond the northeast corner lies the main Red-light district: De Wallen. On the west end of the square is the neoclassical Royal Palace, which served as t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Canal
Canals or artificial waterways are waterways or engineered channels built for drainage management (e.g. flood control and irrigation) or for conveyancing water transport vehicles (e.g. water taxi). They carry free, calm surface flow under atmospheric pressure, and can be thought of as artificial rivers. In most cases, a canal has a series of dams and locks that create reservoirs of low speed current flow. These reservoirs are referred to as ''slack water levels'', often just called ''levels''. A canal can be called a ''navigation canal'' when it parallels a natural river and shares part of the latter's discharges and drainage basin, and leverages its resources by building dams and locks to increase and lengthen its stretches of slack water levels while staying in its valley. A canal can cut across a drainage divide atop a ridge, generally requiring an external water source above the highest elevation. The best-known example of such a canal is the Panama Can ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Flood
A flood is an overflow of water ( or rarely other fluids) that submerges land that is usually dry. In the sense of "flowing water", the word may also be applied to the inflow of the tide. Floods are an area of study of the discipline hydrology and are of significant concern in agriculture, civil engineering and public health. Human changes to the environment often increase the intensity and frequency of flooding, for example land use changes such as deforestation and removal of wetlands, changes in waterway course or flood controls such as with levees, and larger environmental issues such as climate change and sea level rise. In particular climate change's increased rainfall and extreme weather events increases the severity of other causes for flooding, resulting in more intense floods and increased flood risk. Flooding may occur as an overflow of water from water bodies, such as a river, lake, or ocean, in which the water overtops or breaks levees, resulting ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Western Europe
Western Europe is the western region of Europe. The region's countries and territories vary depending on context. The concept of "the West" appeared in Europe in juxtaposition to "the East" and originally applied to the ancient Mediterranean world, the Roman Empire (Western Roman Empire and Eastern Roman Empire), and medieval " Christendom" (Western Christianity and Eastern Christianity). Beginning with the Renaissance and the Age of Discovery, roughly from the 15th century, the concept of ''Europe'' as "the West" slowly became distinguished from and eventually replaced the dominant use of "Christendom" as the preferred endonym within the region. By the Age of Enlightenment and the Industrial Revolution, the concepts of " Eastern Europe" and "Western Europe" were more regularly used. Historical divisions Classical antiquity and medieval origins Prior to the Roman conquest, a large part of Western Europe had adopted the newly developed La Tène culture. As the Roman ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Levee
A levee (), dike (American English), dyke (Commonwealth English), embankment, floodbank, or stop bank is a structure that is usually earthen and that often runs parallel to the course of a river in its floodplain or along low-lying coastlines. The purpose of a levee is to keep the course of rivers from changing and to protect against flooding of the area adjoining the river or coast. Levees can be naturally occurring ridge structures that form next to the bank of a river, or be an artificially constructed fill or wall that regulates water levels. Ancient civilizations in the Indus Valley, ancient Egypt, Mesopotamia and China all built levees. Today, levees can be found around the world, and failures of levees due to erosion or other causes can be major disasters. Etymology Speakers of American English (notably in the Midwest and Deep South) use the word ''levee'', from the French word (from the feminine past participle of the French verb , 'to raise'). It originat ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Amsterdam
Amsterdam ( , , , lit. ''The Dam on the River Amstel'') is the capital and most populous city of the Netherlands, with The Hague being the seat of government. It has a population of 907,976 within the city proper, 1,558,755 in the urban area and 2,480,394 in the metropolitan area. Located in the Dutch province of North Holland, Amsterdam is colloquially referred to as the "Venice of the North", for its large number of canals, now designated a UNESCO World Heritage Site. Amsterdam was founded at the mouth of the Amstel River that was dammed to control flooding; the city's name derives from the Amstel dam. Originally a small fishing village in the late 12th century, Amsterdam became a major world port during the Dutch Golden Age of the 17th century, when the Netherlands was an economic powerhouse. Amsterdam is the leading center for finance and trade, as well as a hub of production of secular art. In the 19th and 20th centuries, the city expanded and many new neighborho ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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