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45-678: Großheubach lies on the right bank of the Main . The community is located on the slopes of the Mittelgebirge Spessart . The highest point in the municipal area is the 439 m-high Ospisrain. Großheubach is located on the Fränkischer Rotwein Wanderweg ("Franconian Red Wine Hiking Trail"). Across the Main lie the hills of the Odenwald . The hamlets of Klotzenhof and Roßhof are part of

90-409: A defined barometric pressure . Generally, the pressure used to set the altimeter is the barometric pressure that would exist at MSL in the region being flown over. This pressure is referred to as either QNH or "altimeter" and is transmitted to the pilot by radio from air traffic control (ATC) or an automatic terminal information service (ATIS). Since the terrain elevation is also referenced to MSL,

135-432: A few metres, in timeframes ranging from minutes to months: Between 1901 and 2018, the average sea level rose by 15–25 cm (6–10 in), with an increase of 2.3 mm (0.091 in) per year since the 1970s. This was faster than the sea level had ever risen over at least the past 3,000 years. The rate accelerated to 4.62 mm (0.182 in)/yr for the decade 2013–2022. Climate change due to human activities

180-676: A possible heathen cult site, the natural sandstone known as Hunnenstein or Heunenschüssel , is found on a hill ridge near Engelberg Abbey, close to the Eselsweg . Main (river) The Main ( German pronunciation: [ˈmaɪn] ) is the longest tributary of the Rhine . It rises as the White Main in the Fichtel Mountains of northeastern Bavaria and flows west through central Germany for 525 kilometres (326 mi) to meet

225-438: A reference datum for mean sea level (MSL). It is also used in aviation, where some heights are recorded and reported with respect to mean sea level (contrast with flight level ), and in the atmospheric sciences , and in land surveying . An alternative is to base height measurements on a reference ellipsoid approximating the entire Earth, which is what systems such as GPS do. In aviation, the reference ellipsoid known as WGS84

270-463: A sharp reduction in greenhouse gas emissions, this may increase to hundreds of millions in the latter decades of the century. Local factors like tidal range or land subsidence will greatly affect the severity of impacts. For instance, sea level rise in the United States is likely to be two to three times greater than the global average by the end of the century. Yet, of the 20 countries with

315-567: A vital part of European " Corridor VII ", the inland waterway link from the North Sea to the Black Sea . In a historical and political sense, the Main line is referred to as the northern border of Southern Germany , with its predominantly Catholic population. The river roughly marked the southern border of the North German Federation , established in 1867 under Prussian leadership as

360-585: Is a timber-frame house in Großheubach core built around 1600. Over the centuries, several conversions to the building were undertaken. After the restorations done between 1987 and 1990, the timber framing was exposed and the original façade was reconstructed. The house served as a dwelling for, among others, the wine merchant Johann Simon Abendanz and the last abbot of the Amorbach Abbey . The Franciscan Kloster Engelberg with its well-known pilgrimage church

405-417: Is an average surface level of one or more among Earth 's coastal bodies of water from which heights such as elevation may be measured. The global MSL is a type of vertical datum  – a standardised geodetic datum  – that is used, for example, as a chart datum in cartography and marine navigation , or, in aviation, as the standard sea level at which atmospheric pressure

450-488: Is because the sea is in constant motion, affected by the tides, wind , atmospheric pressure, local gravitational differences, temperature, salinity , and so forth. The mean sea level at a particular location may be calculated over an extended time period and used as a datum . For example, hourly measurements may be averaged over a full Metonic 19-year lunar cycle to determine the mean sea level at an official tide gauge . Still-water level or still-water sea level (SWL)

495-427: Is due to change in either the volume of water in the world's oceans or the volume of the oceanic basins . Two major mechanisms are currently causing eustatic sea level rise. First, shrinking land ice, such as mountain glaciers and polar ice sheets, is releasing water into the oceans. Second, as ocean temperatures rise, the warmer water expands. Many factors can produce short-term changes in sea level, typically within

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540-483: Is increasingly used to define heights; however, differences up to 100 metres (328 feet) exist between this ellipsoid height and local mean sea level. Another alternative is to use a geoid -based vertical datum such as NAVD88 and the global EGM96 (part of WGS84). Details vary in different countries. When referring to geographic features such as mountains, on a topographic map variations in elevation are shown by contour lines . A mountain's highest point or summit

585-512: Is measured to calibrate altitude and, consequently, aircraft flight levels . A common and relatively straightforward mean sea-level standard is instead a long-term average of tide gauge readings at a particular reference location. Sea levels can be affected by many factors and are known to have varied greatly over geological time scales . Current sea level rise is mainly caused by human-induced climate change . When temperatures rise, mountain glaciers and polar ice sheets melt, increasing

630-619: Is navigable for shipping from its mouth at the Rhine close to Mainz for 396 km (246 mi) to Bamberg . Since 1992, the Main has been connected to the Danube via the Rhine-Main-Danube Canal and the highly regulated Altmühl river. The Main has been canalized with 34 large locks (300 × 12 m or 984 × 39 ft) to allow CEMT class V vessels (110 × 11.45 m or 360.9 × 37.6 ft) to navigate

675-447: Is the level of the sea with motions such as wind waves averaged out. Then MSL implies the SWL further averaged over a period of time such that changes due to, e.g., the tides , also have zero mean. Global MSL refers to a spatial average over the entire ocean area, typically using large sets of tide gauges and/or satellite measurements. One often measures the values of MSL with respect to

720-723: Is the main cause. Between 1993 and 2018, melting ice sheets and glaciers accounted for 44% of sea level rise , with another 42% resulting from thermal expansion of water . Sea level rise lags behind changes in the Earth 's temperature by many decades, and sea level rise will therefore continue to accelerate between now and 2050 in response to warming that has already happened. What happens after that depends on human greenhouse gas emissions . If there are very deep cuts in emissions, sea level rise would slow between 2050 and 2100. It could then reach by 2100 slightly over 30 cm (1 ft) from now and approximately 60 cm (2 ft) from

765-527: Is typically illustrated with the AMSL height in metres, feet or both. In unusual cases where a land location is below sea level, such as Death Valley, California , the elevation AMSL is negative. It is often necessary to compare the local height of the mean sea surface with a "level" reference surface, or geodetic datum, called the geoid . In the absence of external forces, the local mean sea level would coincide with this geoid surface, being an equipotential surface of

810-524: The Kingdom of Bavaria in 1816. In 1828, Kloster Engelberg was taken over by the Franciscans . In 1896, the old town church was expanded and today's parish church thereby came into being. The local council has 20 members (Elections in 2020): Gernot Winter (CSU): Mayor since May 2020. The community's arms might be described thus: Per pale, argent a saltire pattée sable and gules a wheel spoked of six of

855-523: The Old Empire in 1803. The arms have been borne since 1956. In 1247, the church had its first priest, and in 1519, it acquired its first bell. In 1609, a massive fortress church was built in the Romanesque style with defensive towers, parapets and battlements. Between 1895 and 1897, the church underwent remodelling, giving it its current appearance. In 1949, the church acquired four bells. On 1 August 1958,

900-586: The Red Main ( Roter Main ) and the White Main ( Weißer Main ). The Red Main originates in the Franconian Jura mountain range, 50 km (31 mi) in length, and runs through Creussen and Bayreuth . The White Main originates in the Fichtel Mountains ; it is 41 km (25 mi) long. In its upper and middle section, the Main runs through the valleys of the German Highlands. Its lower section crosses

945-517: The Rhine below Rüsselsheim , Hesse . The cities of Mainz and Wiesbaden are close to the confluence. The largest cities on the Main are Frankfurt am Main , Offenbach am Main and Würzburg . It is the longest river lying entirely in Germany (if the Weser - Werra are considered separate). The Main flows through the north and north-west of the state of Bavaria then across southern Hesse ; against

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990-612: The geoid of the Earth, which approximates the local mean sea level for locations in the open ocean. The geoid includes a significant depression in the Indian Ocean , whose surface dips as much as 106 m (348 ft) below the global mean sea level (excluding minor effects such as tides and currents). Precise determination of a "mean sea level" is difficult because of the many factors that affect sea level. Instantaneous sea level varies substantially on several scales of time and space. This

1035-418: The height above mean sea level (AMSL). The term APSL means above present sea level, comparing sea levels in the past with the level today. Earth's radius at sea level is 6,378.137 km (3,963.191 mi) at the equator. It is 6,356.752 km (3,949.903 mi) at the poles and 6,371.001 km (3,958.756 mi) on average. This flattened spheroid , combined with local gravity anomalies , defines

1080-544: The 1690s. Satellite altimeters have been making precise measurements of sea level since the launch of TOPEX/Poseidon in 1992. A joint mission of NASA and CNES , TOPEX/Poseidon was followed by Jason-1 in 2001 and the Ocean Surface Topography Mission on the Jason-2 satellite in 2008. Height above mean sea level ( AMSL ) is the elevation (on the ground) or altitude (in the air) of an object, relative to

1125-973: The 19th century. With high emissions it would instead accelerate further, and could rise by 1.0 m ( 3 + 1 ⁄ 3  ft) or even 1.6 m ( 5 + 1 ⁄ 3  ft) by 2100. In the long run, sea level rise would amount to 2–3 m (7–10 ft) over the next 2000 years if warming stays to its current 1.5 °C (2.7 °F) over the pre-industrial past. It would be 19–22 metres (62–72 ft) if warming peaks at 5 °C (9.0 °F). Rising seas affect every coastal and island population on Earth. This can be through flooding, higher storm surges , king tides , and tsunamis . There are many knock-on effects. They lead to loss of coastal ecosystems like mangroves . Crop yields may reduce because of increasing salt levels in irrigation water. Damage to ports disrupts sea trade. The sea level rise projected by 2050 will expose places currently inhabited by tens of millions of people to annual flooding. Without

1170-448: The Earth's gravitational field which, in itself, does not conform to a simple sphere or ellipsoid and exhibits gravity anomalies such as those measured by NASA's GRACE satellites . In reality, the geoid surface is not directly observed, even as a long-term average, due to ocean currents, air pressure variations, temperature and salinity variations, etc. The location-dependent but time-persistent separation between local mean sea level and

1215-817: The Lords of Klingenberg. In 1291, the Teutonic Knights purchased the village and its surroundings. About 1300, the community's first wooden chapel was built on the Rulesberg (hill), now known as the Engelberg. From 1483, Großheubach belonged to the Archbishopric of Mainz . In 1612, the historic town hall was built. In 1803, the Archbishopric of Mainz was secularized . By way of the Grand Duchy of Frankfurt , Großheubach came to

1260-730: The Lower Main Lowlands ( Hanau-Seligenstadt Basin and northern Upper Rhine Plain ) to Wiesbaden , where it discharges into the Rhine . Major tributaries of the Main are the Regnitz , the Franconian Saale , the Tauber , and the Nidda . The name Main originates from Latin Moenis , Moenus or Menus . It is not related to the name of the city Mainz (Latin: Mogontiacum or Moguntiacum ). The Main

1305-672: The Marégraphe in Marseilles measures continuously the sea level since 1883 and offers the longest collated data about the sea level. It is used for a part of continental Europe and the main part of Africa as the official sea level. Spain uses the reference to measure heights below or above sea level at Alicante , while the European Vertical Reference System is calibrated to the Amsterdam Peil elevation, which dates back to

1350-456: The amount of water in the oceans, while the existing seawater also expands with heat. Because most of human settlement and infrastructure was built in response to a more-normalized sea level with limited expected change, populations affected by sea level rise will need to invest in climate adaptation to mitigate the worst effects or, when populations are at extreme risk, a process of managed retreat . The term above sea level generally refers to

1395-641: The churchtower was destroyed in a storm. In 1987, the church was renovated. This was built in 1611 and 1612 by master builder Otto Oswald Heppeler in Old Franconian timber-frame style. The house served as a seat for a lower official of the Amt of Prozelten. The ground floor was used as a prison. Functioning as the house's owners were Johann Schweikhard von Kronberg, Archbishop of Mainz and Elector, and Caspar Herr zu Eltz, Electoral Mainz Groß hofmeister , councilman and Amtmann at Prozelten. The Abendanz’sches Haus

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1440-405: The first. The black saltire (X-shaped cross) comes from a village court seal from 1654 and refers to the hegemony once exercised by the Teutonic Knights (although their coat of arms showed an upright cross). The Wheel of Mainz and the tinctures argent and gules (silver and red) refer to the community's later feudal overlord, the Archbishopric of Mainz , which held Großheubach until the end of

1485-482: The geoid is referred to as (mean) ocean surface topography . It varies globally in a typical range of ±1 m (3 ft). Several terms are used to describe the changing relationships between sea level and dry land. The melting of glaciers at the end of ice ages results in isostatic post-glacial rebound , when land rises after the weight of ice is removed. Conversely, older volcanic islands experience relative sea level rise, due to isostatic subsidence from

1530-624: The greatest exposure to sea level rise, twelve are in Asia , including Indonesia , Bangladesh and the Philippines. The resilience and adaptive capacity of ecosystems and countries also varies, which will result in more or less pronounced impacts. The greatest impact on human populations in the near term will occur in the low-lying Caribbean and Pacific islands . Sea level rise will make many of them uninhabitable later this century. Pilots can estimate height above sea level with an altimeter set to

1575-551: The height of planetary features. Local mean sea level (LMSL) is defined as the height of the sea with respect to a land benchmark, averaged over a period of time long enough that fluctuations caused by waves and tides are smoothed out, typically a year or more. One must adjust perceived changes in LMSL to account for vertical movements of the land, which can occur at rates similar to sea level changes (millimetres per year). Some land movements occur because of isostatic adjustment to

1620-576: The land; hence a change in relative MSL or ( relative sea level ) can result from a real change in sea level, or from a change in the height of the land on which the tide gauge operates, or both. In the UK, the ordnance datum (the 0 metres height on UK maps) is the mean sea level measured at Newlyn in Cornwall between 1915 and 1921. Before 1921, the vertical datum was MSL at the Victoria Dock, Liverpool . Since

1665-587: The latter it demarcates a third state, Baden-Württemberg , east and west of Wertheim am Main , the northernmost town of that state. The upper end of its basin opposes that of the Danube where the watershed is recognised by natural biologists, sea salinity studies (and hydrology science more broadly) as the European Watershed . The Main begins near Kulmbach in Franconia at the joining of its two headstreams,

1710-481: The melting of ice sheets at the end of the last ice age . The weight of the ice sheet depresses the underlying land, and when the ice melts away the land slowly rebounds . Changes in ground-based ice volume also affect local and regional sea levels by the readjustment of the geoid and true polar wander . Atmospheric pressure , ocean currents and local ocean temperature changes can affect LMSL as well. Eustatic sea level change (global as opposed to local change)

1755-399: The municipality Großheubach. Earlier names for Großheubach are Heidebah (mentioned in 878) and Grotzenheidbach (1358). Großheubach derives from the name of the stream Heubach which flows into the Main here. The area was settled by 1000 BC, as witnessed by urnfields and graves. Local wine growing is first mentioned in the 11th century AD. As of the late 12th century, the place was held by

1800-798: The predecessor of the German Empire . The river course also corresponds with the Speyer line isogloss between Central and Upper German dialects, sometimes mocked as Weißwurstäquator . The Main-Radweg is a major German bicycle path alongside the river. Approximately 600 kilometres long (370 mi), it is the first long-distance instance awarded 5 stars by the General German Bicycle Club ( ADFC ) in 2008. It starts from Creußen or Bischofsgrün and ends in Mainz . Sea level Mean sea level ( MSL , often shortened to sea level )

1845-661: The river is rather narrow on many of the upper reaches, navigation with larger vessels and push convoys requires great skill. The largest cities along the Main are Frankfurt am Main , Offenbach am Main and Würzburg . The Main also passes the following towns: Burgkunstadt , Lichtenfels , Bad Staffelstein , Eltmann , Haßfurt , Schweinfurt , Volkach , Kitzingen , Marktbreit , Ochsenfurt , Karlstadt , Gemünden , Lohr , Marktheidenfeld , Wertheim , Miltenberg , Obernburg , Erlenbach/Main , Aschaffenburg , Seligenstadt , Hainburg , Hanau , Hattersheim , Flörsheim , and Rüsselsheim . The river has gained enormous importance as

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1890-507: The times of the Russian Empire , in Russia and its other former parts, now independent states, the sea level is measured from the zero level of Kronstadt Sea-Gauge. In Hong Kong, "mPD" is a surveying term meaning "metres above Principal Datum" and refers to height of 0.146 m (5.7 in) above chart datum and 1.304 m (4 ft 3.3 in) below the average sea level. In France,

1935-538: The total length of the river. The 16 locks in the adjacent Rhine-Main-Danube Canal and the Danube itself are of the same dimensions. There are 34 weirs and locks along the 380 km navigable portion of the Main, from the confluence with the Regnitz near Bamberg, to the Rhine. Most of the weirs or dams along the Main also have turbines for power generation. Tributaries from source to mouth: Left Right Around Frankfurt are several large inland ports. Because

1980-411: The weight of cooling volcanos. The subsidence of land due to the withdrawal of groundwater is another isostatic cause of relative sea level rise. On planets that lack a liquid ocean, planetologists can calculate a "mean altitude" by averaging the heights of all points on the surface. This altitude, sometimes referred to as a "sea level" or zero-level elevation , serves equivalently as a reference for

2025-522: Was founded about 1300. The building, built in 1630 for the Order of Friars Minor Capuchin , was on King Ludwig I's orders turned over to the Bavarian Franciscans, who still run the abbey today. The Engelberg, the hill on which the monastery stands, which is 250 m above sea level , can be reached over the 612 so-called Engelstaffeln (roughly, "Angel's Steps") made out of bunter . Once considered

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