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Irish Grid Reference System
The Irish grid reference system is a system of geographic grid references used for paper mapping in Ireland (both Northern Ireland and the Republic of Ireland). Any location in Ireland can be described in terms of its distance from the origin (0, 0), which lies off the southwest coast. The Irish grid partially overlaps the British grid, and uses a similar co-ordinate system but with a meridian more suited to its westerly location. Usage In general, neither Ireland nor Great Britain uses latitude or longitude in describing internal geographic locations. Instead grid reference systems are used for mapping. The national grid referencing system was devised by the Ordnance Survey, and is heavily used in their survey data, and in maps (whether published by the Ordnance Survey of Ireland, the Ordnance Survey of Northern Ireland or commercial map producers) based on those surveys. Additionally grid references are commonly quoted in other publications and data sources, such as guide ...
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Grid Reference
A projected coordinate systemalso called a projected coordinate reference system, planar coordinate system, or grid reference systemis a type of spatial reference system that represents locations on Earth using Cartesian coordinate system, Cartesian coordinates (''x'', ''y'') on a planar surface created by a particular map projection. Each projected coordinate system, such as "Universal Transverse Mercator WGS 84 Zone 26N," is defined by a choice of map projection (with specific parameters), a choice of geodetic datum to bind the coordinate system to real locations on the earth, an origin point, and a choice of unit of measure. Hundreds of projected coordinate systems have been specified for various purposes in various regions. When the first standardized coordinate systems were created during the 20th century, such as the Universal Transverse Mercator, State Plane Coordinate System, and British National Grid, they were commonly called ''grid systems''; the term is still common ...
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Lough Ree
Lough Ree (), translated to English as ''King's Lake'' or ''King Lake'', is a lake in the midlands of Republic of Ireland, Ireland, the second of the three major lakes on the River Shannon. Lough Ree is the second largest lake on the Shannon after Lough Derg (Shannon), Lough Derg. The other two major lakes are Lough Allen to the north, and Lough Derg to the south. There are also several minor lakes along the length of the river. The lake serves as a border between the counties of County Longford, Longford and County Westmeath, Westmeath (both in the province of Leinster) on the eastern side and County Roscommon in the province of Connacht on the western side. The lake is popular for fishing and boating. The lake supports a small commercial eel fishery and is locally famous for its ''eels on wheels'' truck. The town of Athlone is situated at the southern end of the lake, and has a harbour for boats going out on the lake. The small town of Lanesborough-Ballyleague, Lanesboro is at ...
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Geographic Coordinate Systems
A geographic coordinate system (GCS) is a spherical or geodetic coordinate system for measuring and communicating positions directly on Earth as latitude and longitude. It is the simplest, oldest, and most widely used type of the various spatial reference systems that are in use, and forms the basis for most others. Although latitude and longitude form a coordinate tuple like a cartesian coordinate system, the geographic coordinate system is not cartesian because the measurements are angles and are not on a planar surface. A full GCS specification, such as those listed in the EPSG and ISO 19111 standards, also includes a choice of geodetic datum (including an Earth ellipsoid), as different datums will yield different latitude and longitude values for the same location. History The invention of a geographic coordinate system is generally credited to Eratosthenes of Cyrene, who composed his now-lost ''Geography'' at the Library of Alexandria in the 3rd century BC. ...
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Maps From Ordnance Survey
A map is a symbolic depiction of interrelationships, commonly spatial, between things within a space. A map may be annotated with text and graphics. Like any graphic, a map may be fixed to paper or other durable media, or may be displayed on a transitory medium such as a computer screen. Some maps change interactively. Although maps are commonly used to depict geography, geographic elements, they may represent any space, real or fictional. The subject being mapped may be two-dimensional such as Earth's surface, three-dimensional such as Earth's interior, or from an abstract space of any dimension. Maps of geographic territory have a very long tradition and have existed from ancient times. The word "map" comes from the , wherein ''mappa'' meant 'napkin' or 'cloth' and ''mundi'' 'of the world'. Thus, "map" became a shortened term referring to a flat representation of Earth's surface. History Maps have been one of the most important human inventions for millennia, allowin ...
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Geography Of Ireland
Ireland is an island in Northern Europe, in the north Atlantic Ocean. The island measures about north-south, and east-west, with a total area of . It lies about , near the western edge of the European continental shelf, part of the Eurasian Plate. Ireland is separated from the island of Great Britain by the Irish Sea to the east, and from mainland Europe by the Celtic Sea to the south. It is bounded to the north by the North Channel and to the south by St George's Channel. Ireland is the second-largest landmass in the British Isles, after Great Britain and before the Isle of Man. Its main geographical features include low central plains surrounded by coastal mountains. The highest peak is Carrauntoohil (), which is above sea level. The western coastline is rugged, with many islands, peninsulas, headlands and bays, while the southern and northern coasts have a smaller number of substantial sea inlets, such as Lough Foyle and Cork Harbour; no part of the land is more th ...
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Transverse Mercator
The transverse Mercator map projection (TM, TMP) is an adaptation of the standard Mercator projection. The transverse version is widely used in national and international mapping systems around the world, including the Universal Transverse Mercator coordinate system, Universal Transverse Mercator. When paired with a suitable geodetic datum, the transverse Mercator delivers high accuracy in zones less than a few degrees in east-west extent. Standard and transverse aspects The transverse Mercator projection is the map projection#Aspect of the projection, transverse aspect of the standard (or ''Normal'') Mercator projection. They share the same underlying mathematical construction and consequently the transverse Mercator inherits many traits from the normal Mercator: * Both map projection, projections are map projection#Cylindrical, cylindrical: for the normal Mercator, the axis of the cylinder coincides with the polar axis and the line of tangency with the equator. For the transver ...
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Airy Modified
The Airy spheroid or Airy ellipsoid is a mathematical model of the Earth, an Earth ellipsoid, designed to fit the well for the British Isles. It is named after its inventor George Biddell Airy, a nineteenth century English mathematician. Airy 1830 ellipsoid The Airy 1830 ellipsoid has an equatorial radius of 6,377,563.396 m, a polar radius of 6,356,256.909 m and an inverse flattening of 299.3249646. The original definition was in feet - using the 1796 definition of the foot, an equatorial radius of 20,923,713 ft and a polar radius of 20,853,810 ft. When the Ordinance Survey retriangulated in 1936 they defined a conversion to metres, namely a ratio of (10^0.48401603)/10 which is approximately 1 ft = 0.3048007491 m. Airy Modified 1849 The 1849 ellipsoid (EPSG:7002), known as Airy Modified 1849, is the 1830 ellipsoid scaled by 0.999965 to better fit the primary triangulation of Ireland. See also * Ordnance Survey National Grid * Irish grid reference system The Irish grid refer ...
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O'Connell Street
O'Connell Street () is a street in the centre of Dublin, Ireland, running north from the River Liffey. It connects the O'Connell Bridge to the south with Parnell Street to the north and is roughly split into two sections bisected by Henry Street. The Luas tram system runs along the street. During the 17th century, it was a narrow street known as Drogheda Street, named after Henry Moore, 1st Earl of Drogheda. It was widened in the late 18th century by the Wide Streets Commission and renamed Sackville Street (''Sráid Saicfil'') after Lionel Sackville, 1st Duke of Dorset. In 1924, it was renamed in honour of nationalist leader Daniel O'Connell, whose statue by John Henry Foley stands at the lower end of the street facing O'Connell Bridge. The street has played an important part in Irish history and features several important monuments, including statues of O'Connell and trade union leader James Larkin, as well as the Spire of Dublin. It formed the backdrop to one of the ...
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Spire Of Dublin
The Spire of Dublin, alternatively titled the Millennium Spire or the ''Monument of Light'' (), is a large, stainless steel, pin-like monument in height, located on the site of the former Nelson's Pillar (and prior to that a statue of William Blakeney) on O'Connell Street, the main thoroughfare of Dublin, Ireland. History Following the bombing of Nelson's Pillar by former IRA members in 1966, and subsequent controlled demolition six days later of what was left, the site remained vacant for years as no decision could be reached on a suitable replacement. Eventually, the '' Anna Livia'' monument was installed on the site to celebrate the 1988 Dublin Millennium celebrations. In 1998, as part of a planned multi-million euro re-development of O'Connell Street (as well as a memorial to the upcoming millennium and the aspirations of Ireland in the midst of its Celtic Tiger economic boom), a competition was launched to find a replacement for Nelson's Pillar. O'Connell Street had bee ...
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Irish Grid
The Irish grid reference system is a system of geographic grid references used for paper mapping in Ireland (both Northern Ireland and the Republic of Ireland). Any location in Ireland can be described in terms of its distance from the origin (0, 0), which lies off the southwest coast. The Irish grid partially overlaps the British grid, and uses a similar co-ordinate system but with a meridian more suited to its westerly location. Usage In general, neither Ireland nor Great Britain uses latitude or longitude in describing internal geographic locations. Instead grid reference systems are used for mapping. The national grid referencing system was devised by the Ordnance Survey, and is heavily used in their survey data, and in maps (whether published by the Ordnance Survey of Ireland, the Ordnance Survey of Northern Ireland or commercial map producers) based on those surveys. Additionally grid references are commonly quoted in other publications and data sources, such as guide bo ...
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Satellite Navigation
A satellite navigation or satnav system is a system that uses satellites to provide autonomous geopositioning. A satellite navigation system with global coverage is termed global navigation satellite system (GNSS). , four global systems are operational: the United States's Global Positioning System (GPS), Russia's Global Navigation Satellite System (GLONASS), China's BeiDou Navigation Satellite System (BDS), and the European Union, European Union's Galileo (satellite navigation), Galileo. Two regional systems are operational: India's Indian Regional Navigation Satellite System, NavIC and Japan's Quasi-Zenith Satellite System, QZSS. ''Satellite-based augmentation systems'' (SBAS), designed to enhance the accuracy of GNSS, include Japan's Quasi-Zenith Satellite System (QZSS), India's GAGAN and the European EGNOS, all of them based on GPS. Previous iterations of the BeiDou navigation system and the present Indian Regional Navigation Satellite System (IRNSS), operationally known as ...
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County Roscommon
County Roscommon () is a Counties of Ireland, county in Republic of Ireland, Ireland. It is part of the province of Connacht and the Northern and Western Region. It is the List of Irish counties by area, 11th largest Irish county by area and List of Irish counties by population, 26th most populous. Its county town and largest town is Roscommon. Roscommon County Council is the Local government in the Republic of Ireland, local authority for the county. The population of the county was 69,995 as of the 2022 census. Etymology County Roscommon is named after the county town of Roscommon. Roscommon comes from the Irish ''Ros'' meaning a wooded, gentle height and ''Coman mac Faelchon, Comán'', the first abbot and bishop of Roscommon who founded the first monastery there in 550 AD. Geography County Roscommon has an area of . Lough Key in north Roscommon is noted for having thirty-two islands. The geographical centre of Ireland is located on the western shore of Lough Ree in the south ...
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