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Topographic Prominence
In topography, prominence (also referred to as autonomous height, relative height, and shoulder drop in US English, and drop or relative height in British English) measures the height of a mountain or hill's summit relative to the lowest contour line encircling it but containing no higher summit within it. It is a measure of the independence of a summit. A peak's ''key col'' (the highest col surrounding the peak) is a unique point on this contour line and the ''parent peak'' is some higher mountain, selected according to various criteria. Definitions The prominence of a peak may be defined as the least drop in height necessary in order to get from the summit to any higher terrain. This can be calculated for a given peak in the following way: for every path connecting the peak to higher terrain, find the lowest point on the path; the ''key col'' (or ''key saddle'', or ''linking col'', or ''link'') is defined as the highest of these points, along all connecting paths; the pro ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Topographic Isolation And Prominence
Topography is the study of the forms and features of land surfaces. The topography of an area may refer to the land forms and features themselves, or a description or depiction in maps. Topography is a field of geoscience and planetary science and is concerned with local detail in general, including not only relief, but also natural, artificial, and cultural features such as roads, land boundaries, and buildings. In the United States, topography often means specifically ''relief'', even though the USGS topographic maps record not just elevation contours, but also roads, populated places, structures, land boundaries, and so on. Topography in a narrow sense involves the recording of relief or terrain, the three-dimensional quality of the surface, and the identification of specific landforms; this is also known as geomorphometry. In modern usage, this involves generation of elevation data in digital form ( DEM). It is often considered to include the graphic representation of t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Stratovolcano
A stratovolcano, also known as a composite volcano, is a conical volcano built up by many layers (strata) of hardened lava and tephra. Unlike shield volcanoes, stratovolcanoes are characterized by a steep profile with a summit crater and periodic intervals of explosive eruptions and effusive eruptions, although some have collapsed summit craters called calderas. The lava flowing from stratovolcanoes typically cools and hardens before spreading far, due to high viscosity. The magma forming this lava is often felsic, having high-to-intermediate levels of silica (as in rhyolite, dacite, or andesite), with lesser amounts of less-viscous mafic magma. Extensive felsic lava flows are uncommon, but have travelled as far as . Stratovolcanoes are sometimes called composite volcanoes because of their composite stratified structure, built up from sequential outpourings of erupted materials. They are among the most common types of volcanoes, in contrast to the less common shield volcano ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hail Storm Hill
Hail Storm Hill, also known as Cowpe Moss, is the highest point of the Rossendale Valley, England, an area of moorland and hill country situated between the West Pennine Moors and the South Pennines. It is wholly within Lancashire, although the administrative county boundary with the Metropolitan Borough of Rochdale passes just a kilometre to the south-east of the summit. Scout Moor Wind Farm now spans Hail Storm Hill. The Forest of Rossendale also contains the Marilyn of Freeholds Top and the summit of Great Hameldon. Ascents The shortest route to the summit is from the village of Cowpe just to the north, a journey of just over two miles (3 km) there and back that involves about of climb. Another option is from the road summit of the A680 at Turf Moor to the south-west, long with of climb. The hill can also be climbed from Rawtenstall to the north-west. The hill is crossed by three long-distance footpaths: the Pennine Bridleway passes just to the north of the summ ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Winter Hill (North West England)
Winter Hill is a hill on the border of the boroughs of Chorley, Blackburn with Darwen and Bolton, in the historic county of Lancashire in North West England. It is located on Rivington Moor, Chorley and is high. Part of the West Pennine Moors, it is a popular walking area, and has been the site of mining activity, aeroplane disasters and murders. Its prominent position made it the ideal site for the Winter Hill TV Mast, transmitting to a large part of North West England. There is also a number of other telecommunication masts and towers around the summit and side of the hill for mobile phones, Professional Mobile Radio users and emergency services. Lancashire Constabulary was the first to use the site for one of their base stations in 1950; they had to build the road and it is said to have been built by policemen. Paths to the summit lead from Belmont (in Blackburn with Darwen), Rivington (in Chorley borough), and Horwich and Blackrod (in Bolton borough). The summit can also ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Billinge Hill
Billinge Hill, also known as Billinge Lump, is in the Metropolitan Borough of St Helens in North West England. With a maximum elevation of , it is the highest point of Merseyside. It lies in Billinge, within the historic county boundaries of Lancashire, and it is one of the 176 hills graded as a Marilyn in England. A beacon tower is at the summit. Built as a summerhouse to Winstanley Hall in the 18th century, it was used for the Year 2000 celebrations. Most fireworks displays for miles around can be seen from the summit and people often gather there in small numbers to watch displays over the towns of Wigan and St Helens and the local village of Rainford. Over the years it has been covered in graffiti which was recently cleaned off and the metal panels restricting access to the inside of the beacon have been painted black. Nearby to the north-west are several large transmitter masts which take advantage of the height and relative isolation of the land. The views are fairly e ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ben Nevis
Ben Nevis ( ; gd, Beinn Nibheis ) is the highest mountain in Scotland, the United Kingdom and the British Isles. The summit is above sea level and is the highest land in any direction for . Ben Nevis stands at the western end of the Grampian Mountains in the Highland region of Lochaber, close to the town of Fort William. The mountain is a popular destination, attracting an estimated 130,000 ascents a year, around three-quarters of which use the Mountain Track from Glen Nevis. The cliffs of the north face are among the highest in Scotland, providing classic scrambles and rock climbs of all difficulties for climbers and mountaineers. They are also the principal locations in Scotland for ice climbing. The summit, which is the collapsed dome of an ancient volcano, features the ruins of an observatory which was continuously staffed between 1883 and 1904. The meteorological data collected during this period is still important for understanding Scottish mountain weather. C. T ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
British Isles
The British Isles are a group of islands in the North Atlantic Ocean off the north-western coast of continental Europe, consisting of the islands of Great Britain, Ireland, the Isle of Man, the Inner and Outer Hebrides, the Northern Isles, and over six thousand smaller islands."British Isles", ''Encyclopædia Britannica''. They have a total area of and a combined population of almost 72 million, and include two sovereign states, the Republic of Ireland (which covers roughly five-sixths of Ireland), and the United Kingdom of Great Britain and Northern Ireland. The Channel Islands, off the north coast of France, are normally taken to be part of the British Isles, even though they do not form part of the archipelago. The oldest rocks are 2.7 billion years old and are found in Ireland, Wales and the northwest of Scotland. During the Silurian period, the north-western regions collided with the south-east, which had been part of a separate continental landmass. The ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Caspian Sea
The Caspian Sea is the world's largest inland body of water, often described as the world's largest lake or a full-fledged sea. An endorheic basin, it lies between Europe and Asia; east of the Caucasus, west of the broad steppe of Central Asia, south of the fertile plains of Southern Russia in Eastern Europe, and north of the mountainous Iranian Plateau of Western Asia. It covers a surface area of (excluding the highly saline lagoon of Garabogazköl to its east) and a volume of . It has a salinity of approximately 1.2% (12 g/L), about a third of the salinity of average seawater. It is bounded by Kazakhstan to the northeast, Russia to the northwest, Azerbaijan to the southwest, Iran to the south, and Turkmenistan to the southeast. The sea stretches nearly from north to south, with an average width of . Its gross coverage is and the surface is about below sea level. Its main freshwater inflow, Europe's longest river, the Volga, enters at the shallow north end. Two deep ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Baltic Sea
The Baltic Sea is an arm of the Atlantic Ocean that is enclosed by Denmark, Estonia, Finland, Germany, Latvia, Lithuania, Poland, Russia, Sweden and the North and Central European Plain. The sea stretches from 53°N to 66°N latitude and from 10°E to 30°E longitude. A marginal sea of the Atlantic, with limited water exchange between the two water bodies, the Baltic Sea drains through the Danish Straits into the Kattegat by way of the Øresund, Great Belt and Little Belt. It includes the Gulf of Bothnia, the Bay of Bothnia, the Gulf of Finland, the Gulf of Riga and the Bay of Gdańsk. The " Baltic Proper" is bordered on its northern edge, at latitude 60°N, by Åland and the Gulf of Bothnia, on its northeastern edge by the Gulf of Finland, on its eastern edge by the Gulf of Riga, and in the west by the Swedish part of the southern Scandinavian Peninsula. The Baltic Sea is connected by artificial waterways to the White Sea via the White Sea–Baltic Canal and to t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Water Divide
A drainage divide, water divide, ridgeline, watershed, water parting or height of land is elevated terrain that separates neighboring drainage basins. On rugged land, the divide lies along topographical ridges, and may be in the form of a single range of hills or mountains, known as a dividing range. On flat terrain, especially where the ground is marshy, the divide may be difficult to discern. A triple divide is a point, often a summit, where three drainage basins meet. A ''valley floor divide'' is a low drainage divide that runs across a valley, sometimes created by deposition or stream capture. Major divides separating rivers that drain to different seas or oceans are continental divides. The term ''height of land'' is used in Canada and the United States to refer to a drainage divide. It is frequently used in border descriptions, which are set according to the "doctrine of natural boundaries". In glaciated areas it often refers to a low point on a divide where it is po ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lake Onega
Lake Onega (; also known as Onego, rus, Оне́жское о́зеро, r=Onezhskoe ozero, p=ɐˈnʲɛʂskəɪ ˈozʲɪrə; fi, Ääninen, Äänisjärvi; vep, Änine, Änižjärv) is a lake in northwestern Russia, on the territory of the Republic of Karelia, Leningrad Oblast and Vologda Oblast. It belongs to the basin of the Baltic Sea, and is the second-largest lake in Europe after Lake Ladoga, slightly smaller than Lebanon. The lake is fed by about 50 rivers and is drained by the Svir. There are about 1,650 islands on the lake. They include Kizhi, which hosts a historical complex of 89 Orthodox churches and other wooden structures of the 15th–20th centuries. The complex includes a UNESCO World Heritage site, Kizhi Pogost. The eastern shores of the lake contain about 1,200 petroglyphs (rock engravings) dated to the 4th–2nd millennia BC, which have Petroglyphs of Lake Onega and the White Sea, also been inscribed as a UNESCO World Heritage site. The major cities on the lake ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
