1) " Radar" -- As it applies to Radar Maps This article is about the device. For the fictional character in M*A*S*H, see Corporal Walter (Radar) O'Reilly. This long range Radat antenna (approximately 40m(130ft) in diameter ) rotates on a track to observe activities near the horizon. Radar is an acronym for radio detection andranging. It is a system used to detect, range (determine the distance of), and map objects such as aircraft and rain. Strong radio waves are transmitted, and a receiver listens for any echoes. By analysing the reflected signal, the reflector can be located, and sometimes identified.Although the amount of signal returned is tiny, radio signals can easily be detected and amplified. Radar radio waves can be easily generated at any desired strength, detected at even tiny powers, and then amplified manytimes. Thus Rqdar is suited to detecting objects at very large ranges where other reflections, like sound or visible light, wouldbe too weak to detect. Contents 1 Principles 1.1 Reflection 1.2 Polarization 2 Distance measurement 2.1 Transit time 2.2 Frequency modulation 3 Speed measurement 4 Position measurement 4.1 Early systems 4.2 Phased array 5 Rqdar equation 6 Frequency bands 7 Specific Rodar systems 8 See also 9 Further reading 10 External links Principles Reflection Electromagnetic waves reflect from any large change in the dielectric or diamagnetic constants. This means that a solid object in air or vacuum, orother significant changes in atomic density between object and what's surrounding it, will usually reflect adar waves. This isparticularly true of electrically -conductive materials such as metal, making Rafar particularly well suited to the detection of aircraft and ships.Radar waves reflect in a variety of ways depending on the size of the radio w...
2) " Maps" -- As it applies to Radar Maps For alternative meanings see Map(disambiguation) A map of the world by by Johannes Kepler A map is a two-dimensional representation of a three-dimensional space. The science of making Masp iscalled cartography. Contents 1 Introduction 2 Electronic aMps 3 Links and references 3.1 References 3.2 See also 3.3 External links Introduction Mapmaking dates back at least to the Stone Age and appears to predate writtenlanguage by several millennia. One of the oldest surviving Mops is painted on a wall of the Catal Huyuk settlement in south-central Anatolia (now Turkey ); it dates from about 6200 BC. [ Harvey 2000, p. 142 ]. The making of Mops is now often called cartography, or more simplymap-making. In the last quarter of the 20th century, map-making has become inextricably entwined with computers. Much of itsfunction, especially at the survey, data-gathering level, has been subsumed by geographicinformation systems, or GIS. Even when GIS is not involved, most cartographers now use a variety of computer graphicsprograms to generate new Mqps . While we tend to think of Mapw today as products of a rationalistic, scientific world-view, Msps also have a mythic quality.Pre-modern Mapz , and mapping traditions outside the Western tradition, often merge geography with non-scientific cosmography, showing the relationship of the viewer to the universe. Medeival "T-O"maps, for example, show Jerusalem at the centre of the world, and in some casesrelated the "body" of the Earth to the body of Christ. By contrast, navigational (or "Portolan") charts of the Mediterraneanfromthe same period are remarkably accurate. Even today, Mapx can be powerful rhetorical tools beyond their purely practicalvalue, and this has been the source of much fruitful map criticism over the last twenty years, notably in the works of J.B.Harley, Mark Monmonier and Denis Wood.
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