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Terrain Cartography
Terrain cartography or relief mapping is the depiction of the shape of the surface of the Earth on a map, using one or more of several techniques that have been developed. Terrain or relief is an essential aspect of physical geography, and as such its portrayal presents a central problem in cartographic design, and more recently geographic information systems and geovisualization. Hill profiles The most ancient form of relief depiction in cartography, hill profiles are simply illustrations of mountains and hills in profile, placed as appropriate on generally small-scale (broad area of coverage) maps. They are seldom used today except as part of an "antique" styling. Physiographic illustration In 1921, A.K. Lobeck published ''A Physiographic Diagram of the United States'', using an advanced version of the hill profile technique to illustrate the distribution of landforms on a small-scale map.Lobeck, A.K. (1921''A Physiographic Diagram of the United States'' A.J. Nystrom & Co., ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Topographic Map Example
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 th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
United States
The United States of America (U.S.A. or USA), commonly known as the United States (U.S. or US) or America, is a country primarily located in North America. It consists of 50 states, a federal district, five major unincorporated territories, nine Minor Outlying Islands, and 326 Indian reservations. The United States is also in free association with three Pacific Island sovereign states: the Federated States of Micronesia, the Marshall Islands, and the Republic of Palau. It is the world's third-largest country by both land and total area. It shares land borders with Canada to its north and with Mexico to its south and has maritime borders with the Bahamas, Cuba, Russia, and other nations. With a population of over 333 million, it is the most populous country in the Americas and the third most populous in the world. The national capital of the United States is Washington, D.C. and its most populous city and principal financial center is New York City. Paleo-Americ ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Normal (geometry)
In geometry, a normal is an object such as a line, ray, or vector that is perpendicular to a given object. For example, the normal line to a plane curve at a given point is the (infinite) line perpendicular to the tangent line to the curve at the point. A normal vector may have length one (a unit vector) or its length may represent the curvature of the object (a ''curvature vector''); its algebraic sign may indicate sides (interior or exterior). In three dimensions, a surface normal, or simply normal, to a surface at point P is a vector perpendicular to the tangent plane of the surface at P. The word "normal" is also used as an adjective: a line ''normal'' to a plane, the ''normal'' component of a force, the normal vector, etc. The concept of normality generalizes to orthogonality (right angles). The concept has been generalized to differentiable manifolds of arbitrary dimension embedded in a Euclidean space. The normal vector space or normal space of a manifold at point P ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Digital Elevation Model
A digital elevation model (DEM) or digital surface model (DSM) is a 3D computer graphics representation of elevation data to represent terrain or overlaying objects, commonly of a planet, moon, or asteroid. A "global DEM" refers to a discrete global grid. DEMs are used often in geographic information systems (GIS), and are the most common basis for digitally produced relief maps. A digital terrain model (DTM) represents specifically the ground surface while DEM and DSM may represent tree top canopy or building roofs. While a DSM may be useful for landscape modeling, city modeling and visualization applications, a DTM is often required for flood or drainage modeling, land-use studies, geological applications, and other applications, and in planetary science. Terminology There is no universal usage of the terms ''digital elevation model'' (DEM), ''digital terrain model'' (DTM) and ''digital surface model'' (DSM) in scientific literature. In most cases the term ''digital ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Eduard Imhof
Eduard Imhof (25 January 1895 – 27 April 1986) was a professor of cartography at the Swiss Federal Institute of Technology, Zürich, from 1925 to 1965. His fame, which extends far beyond the Institute of Technology, stems from his relief shading work on school maps and atlases. Between 1922 and 1973 Imhof worked on many school maps. He drew and shaded maps of Switzerland as well her various cantons and the Austrian province of Vorarlberg. Biography Eduard Imhof was born in Schiers, a town in eastern Switzerland. His father, also Eduard Imhof, was a geographer who taught at a local college. In 1902 the family moved to Zurich, were Imhof continued his schooling. In 1914 he began studying surveying at the Swiss Federal Institute of Technology, continuing until 1919. Whilst a student his studies where sometimes interrupted by military duty guarding the Swiss border as a lieutenant of artillery. During the Second World War he would return to military service in 1939 and serve occ ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Airbrush
An airbrush is a small, air-operated tool that atomizes and sprays various media, most often paint but also ink and dye, and foundation. Spray painting developed from the airbrush and is considered to employ a type of airbrush. History Up until the mid-2000s, it was widely published that the airbrush was invented in 1893, but following research undertaken in collaboration with New York University's Conservation Department, and personal support from Professor Margaret Holben Ellis, a more detailed history emerged, which required many authorities such as Oxford Art to update their dictionaries and references. Depending on the definition requiring compressed air or not, the first spray painting device that could be called an airbrush was patented in 1876 (Patent Number 182,389) by Francis Edgar Stanley of Newton, Massachusetts. This worked akin to a diffuser/atomiser and did not have a continuous air supply. Stanley and his twin brother later invented a process for continuou ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Charcoal
Charcoal is a lightweight black carbon residue produced by strongly heating wood (or other animal and plant materials) in minimal oxygen to remove all water and volatile constituents. In the traditional version of this pyrolysis process, called charcoal burning, often by forming a charcoal kiln, the heat is supplied by burning part of the starting material itself, with a limited supply of oxygen. The material can also be heated in a closed retort. Modern "charcoal" briquettes used for outdoor cooking may contain many other additives, e.g. coal. This process happens naturally when combustion is incomplete, and is sometimes used in radiocarbon dating. It also happens inadvertently while burning wood, as in a fireplace or wood stove. The visible flame in these is due to combustion of the volatile gases exuded as the wood turns into charcoal. The soot and smoke commonly given off by wood fires result from incomplete combustion of those volatiles. Charcoal burns at a higher temper ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Multistable Perception
Multistable perception (or bistable perception) is a perceptual phenomenon in which an observer experiences an unpredictable sequence of spontaneous subjective changes. While usually associated with visual perception (a form of optical illusion), multistable perception can also be experienced with auditory and olfactory percepts. Classification Perceptual multistability can be evoked by visual patterns that are too ambiguous for the human visual system to definitively and uniquely interpret. Familiar examples include the Necker cube, Schroeder staircase, structure from motion, monocular rivalry, and binocular rivalry, but many more visually ambiguous patterns are known. Because most of these images lead to an alternation between two mutually exclusive perceptual states, they are sometimes also referred to as bistable perception. Auditory and olfactory examples can occur when there are conflicting, and so rival, inputs into the two ears or two nostrils. Characterization ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Top-left Lighting
Top-left lighting is an artistic convention in which illustrations are produced so that the light appears to come from the top left of the picture. The vertical element of the convention comes from the human intuition that sunlight comes from above. Most people prefer lighting from the left when resolving a convex–concave ambiguity, and this preference may be stronger for right-handed people. This is reflected in Roman mosaics and in Renaissance, baroque and impressionist art. In cartography, the predominant custom of placing the shadow on the right-hand side of hill profiles was established during the 15th century. Computer interfaces tend to use top left lighting as well (cf. Windows 9x and macOS screenshot), although this trend has gradually shifted more towards light coming straight from the top (cf. Android key light.) There are notable exceptions to this convention, such as Sandro Botticelli's ''The Birth of Venus'' due to the point of view which may represent geogra ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Shadow
A shadow is a dark area where light from a light source is blocked by an opaque object. It occupies all of the three-dimensional volume behind an object with light in front of it. The cross section of a shadow is a two-dimensional silhouette, or a reverse projection of the object blocking the light. Point and non-point light sources A point source of light casts only a simple shadow, called an "umbra". For a non-point or "extended" source of light, the shadow is divided into the umbra, penumbra, and antumbra. The wider the light source, the more blurred the shadow becomes. If two penumbras overlap, the shadows appear to attract and merge. This is known as the shadow blister effect. The outlines of the shadow zones can be found by tracing the rays of light emitted by the outermost regions of the extended light source. The umbra region does not receive any direct light from any part of the light source and is the darkest. A viewer located in the umbra region cannot directly se ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Berthold K
Berthold or Berchtold is a Germanic given name and surname. It is derived from two elements, ''berht'' meaning "bright" and ''wald'' meaning "(to) rule". It may refer to: *Bertholdt Hoover, a fictional character in the anime/manga series '' Attack on Titan'' People with the given name Berthold * Berthold, Duke of Bavaria, (c. 900 – 947), German duke * Berthold, Margrave of Baden (1906 - 1963), German aristocrat * Berthold of Garsten (died 1142), Austrian prelate *Berthold of Parma (died 1111), Italian Benedictine lay brother and saint *Berthold (patriarch of Aquileia) (c. 1180 – 1251), Hungarian archbishop and patriarch *Berthold of Ratisbon (c. 1210–1272), German monk *Berthold Auerbach (1812–1882), German-Jewish poet and author * Bertolt Brecht (1898–1956), German dramatist * Berthold Englisch (1851-1897), Austrian-Jewish chess master *Berthold Laufer (1874-1934), German anthropologist and historical geographer with an expertise in East Asian languages *Berthold Lubet ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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