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USGS DEM
The USGS DEM standard is a geospatial file format developed by the United States Geological Survey
United States Geological Survey
for storing a raster-based digital elevation model. It is an open standard, and is used throughout the world. It has been superseded by the USGS's own SDTS format but the format remains popular due to large numbers of legacy files, self-containment, relatively simple field structure and broad, mature software support. DEM Level[edit] A USGS DEM can be classified into one of four levels of quality
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Geospatial
Geographic data and information are defined in the ISO/TC 211 series of standards as data and information having an implicit or explicit association with a location relative to the Earth.[1] It is also called geospatial data and information,[citation needed] georeferenced data and information,[citation needed] as well as geodata and geoinformation.[citation needed] Approximately 90% of government sourced data has a location component.[2]Contents1 See also 2 References 3 Further reading 4 External linksSee also[edit] Main category: GeospatialGeographic database Geographic information science Geographic information systems GeomaticsReferences[edit]^ ISO/TC 211 Multi-Lingual Glossary of Terms ^ Romero, Melissa. Curbed https://philly.curbed.com/2017/11/7/16617296/philadelphia-properties-land-vacant-lot-atlas-map-tool. Retrieved 7 November 2017.  Missing or empty title= (help)Further reading[edit]Roger A
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Photogrammetry
Photogrammetry
Photogrammetry
is the science of making measurements from photographs, especially for recovering the exact positions of surface points. Photogrammetry
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Special
Special
Special
or specials may refer to:Contents1 Music 2 Film and television 3 Other uses 4 See alsoMusic[edit] Special
Special
(album), a 1992
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Universal Transverse Mercator
The Universal Transverse Mercator
Transverse Mercator
(UTM) conformal projection uses a 2-dimensional
2-dimensional
Cartesian coordinate system
Cartesian coordinate system
to give locations on the surface of the Earth. Like the traditional method of latitude and longitude, it is a horizontal position representation, i.e. it is used to identify locations on the Earth
Earth
independently of vertical position. However, it differs from that method in several respects. The UTM system is not a single map projection
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Quadrangle (geography)
In geology or geography, the word "quadrangle" usually refers to a United States Geological Survey
United States Geological Survey
(USGS) 7.5-minute quadrangle map, which are usually named after a local physiographic feature. The shorthand "quad" is also used, especially with the name of the map; for example, "the Ranger Creek, Texas quad map". These maps are one-quarter of the older 15-minute series. On a quadrangle map, the north and south limits of the quadrangle are not straight lines, but are actually curved to match Earth's lines of latitude on the standard projection. The east and west limits are usually not parallel as they match Earth's lines of longitude. In the United States, a 7.5 minute quadrangle map covers an area of 49 to 70 square miles (130 to 180 km2).[1] The surfaces of other planets have also been divided into quadrangles by the USGS
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C++
C is the third letter in the English alphabet
English alphabet
and a letter of the alphabets of many other writing systems which inherited it from the Latin
Latin
alphabet. It is also the third letter of the ISO basic Latin alphabet. It is named cee (pronounced /siː/) in English.[1]Contents1 History 2 Later use 3 Use in writing systems3.1 English 3.2 Other languages 3.3 Other systems 3.4 Digraphs4 Related characters4.1 Ancestors, descendants and siblings 4.2 Derived ligatures, abbreviations, signs and symbols5 Computing codes 6 Other representations 7 See also 8 References 9 External linksHistoryPhoenician gaml Arabic ǧīm Hebrew gimel Greek Gamma Etruscan  C Old Latin C (G)"C" comes from the same letter as "G". The Semites named it gimel. The sign is possibly adapted from an Egyptian hieroglyph for a staff sling, which may have been the meaning of the name gimel
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C (programming Language)
C (/siː/, as in the letter c) is a general-purpose, imperative computer programming language, supporting structured programming, lexical variable scope and recursion, while a static type system prevents many unintended operations
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FORTRAN
Fortran
Fortran
(/ˈfɔːrtræn/; formerly FORTRAN, derived from Formula Translation[2]) is a general-purpose, imperative programming language that is especially suited to numeric computation and scientific computing. Originally developed by IBM[3] in the 1950s for scientific and engineering applications, FORTRAN came to dominate this area of programming early on and has been in continuous use for over half a century in computationally intensive areas such as numerical weather prediction, finite element analysis, computational fluid dynamics, computational physics, crystallography and computational chemistry. It is a popular language for high-performance computing[4] and is used for programs that benchmark and rank the world's fastest supercomputers.[5] Fortran
Fortran
encompasses a lineage of versions, each of which evolved to add extensions to the language while usually retaining compatibility with prior versions
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Gzip
gzip is a file format and a software application used for file compression and decompression. The program was created by Jean-loup Gailly and Mark Adler as a free software replacement for the compress program used in early Unix
Unix
systems, and intended for use by GNU
GNU
(the "g" is from "GNU")
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Hypsography
The elevation of a geographic location is its height above or below a fixed reference point, most commonly a reference geoid, a mathematical model of the Earth's sea level as an equipotential gravitational surface (see Geodetic system, vertical datum). The term "elevation" is mainly used when referring to points on the Earth's surface, while "altitude" or "geopotential height" is used for points above the surface, such as an aircraft in flight or a spacecraft in orbit, and "depth" is used for points below the surface. Elevation
Elevation
is not to be confused with the distance from the center of the Earth; due to equatorial bulge, the summits of Mt
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United States Geological Survey
The United States
United States
Geological Survey (USGS, formerly simply Geological Survey) is a scientific agency of the United States
United States
government. The scientists of the USGS study the landscape of the United States, its natural resources, and the natural hazards that threaten it. The organization has four major science disciplines, concerning biology, geography, geology, and hydrology. The USGS is a fact-finding research organization with no regulatory responsibility. The USGS is a bureau of the United States
United States
Department of the Interior; it is that department's sole scientific agency. The USGS employs approximately 8,670 people[2] and is headquartered in Reston, Virginia
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Digital Line Graph
A Digital Line Graph (DLG) is a cartographic map feature represented in digital vector form that is distributed by the U.S. Geological Survey (USGS). DLGs are collected from USGS maps and are distributed in large-, intermediate- and small-scale with up to nine different categories of features, depending on the scale
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Autocorrelation
Autocorrelation, also known as serial correlation, is the correlation of a signal with a delayed copy of itself as a function of delay. Informally, it is the similarity between observations as a function of the time lag between them
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Minute Of Arc
A minute of arc, arcminute (arcmin), arc minute, or minute arc is a unit of angular measurement equal to 1/60 of one degree. Since one degree is 1/360 of a turn (or complete rotation), one minute of arc is 1/7004216000000000000♠21600 of a turn. A minute of arc is π/7004108000000000000♠10800 of a radian. A second of arc, arcsecond (arcsec), or arc second is 1/60 of an arcminute, 1/7003360000000000000♠3600 of a degree, 1/7006129600000000000♠1296000 of a turn, and π/7005648000000000000♠648000 (about 1/7005206265000000000♠206265) of a radian
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SDTS
Spatial Data Transfer Standard, or SDTS, is a standard used to describe earth-referenced spatial data. It was designed to easily transfer and use spatial data on different computer platforms. The FGDC has proposed to withdraw the standard. The USGS made an effort to promulgate the standard by making a large volume of data available at no cost and many companies supported the standard by writing translators to transform the data into different formats. External links[edit]FGDC requests comment on proposal to withdraw Spatial Data Transfer Standard (SDTS), Parts 1-7 How are private companies implementing SDTS? Official USGS SDTS web siteUSGS: "What is SDTS?"GeoCommunity: SDTS Resources, Articles, and FeaturesThis cartography or mapping term article is a stub
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