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John P. Snyder John Parr Snyder جون بي سنايدر
rdfs:comment
John Parr Snyder (12 avril 1926 - 28 avril 1997) est un cartographe américain connu pour ses travaux sur les projections cartographiques à l'United States Geological Survey (USGS). On lui doit, entre autres, la projection qui permet de générer des cartes à partir d'images prises par les satellites artificiels, la (en) en:Space-oblique Mercator projection utilisée pour générer des cartes à partir des images de Landsat-4 en 1978. John Parr Snyder (12 April 1926 – 28 April 1997) was an American cartographer most known for his work on map projections for the United States Geological Survey (USGS). Educated at Purdue and MIT as a chemical engineer, he had a lifetime interest in map projections as a hobby, but found the calculations tedious without the benefit of expensive calculators or computers. At a cartography conference in 1976, he learned of the need for a map projection that would suit the special needs of Landsat satellite imagery. He had recently been able to purchase a pocket calculator (TI-59) of his own and set to work creating what became known as the space-oblique mercator projection, which he provided to the USGS at no charge. جون بي سنايدر (بالإنجليزية: John P. Snyder)‏ هو عالم رسم الخرائط وجيولوجي أمريكي، ولد في 12 أبريل 1926، وتوفي في 28 أبريل 1997.
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جون بي سنايدر (بالإنجليزية: John P. Snyder)‏ هو عالم رسم الخرائط وجيولوجي أمريكي، ولد في 12 أبريل 1926، وتوفي في 28 أبريل 1997. John Parr Snyder (12 avril 1926 - 28 avril 1997) est un cartographe américain connu pour ses travaux sur les projections cartographiques à l'United States Geological Survey (USGS). On lui doit, entre autres, la projection qui permet de générer des cartes à partir d'images prises par les satellites artificiels, la (en) en:Space-oblique Mercator projection utilisée pour générer des cartes à partir des images de Landsat-4 en 1978. John Parr Snyder (12 April 1926 – 28 April 1997) was an American cartographer most known for his work on map projections for the United States Geological Survey (USGS). Educated at Purdue and MIT as a chemical engineer, he had a lifetime interest in map projections as a hobby, but found the calculations tedious without the benefit of expensive calculators or computers. At a cartography conference in 1976, he learned of the need for a map projection that would suit the special needs of Landsat satellite imagery. He had recently been able to purchase a pocket calculator (TI-59) of his own and set to work creating what became known as the space-oblique mercator projection, which he provided to the USGS at no charge. He was subsequently offered a job within the USGS within two years, where his work apparently led him to the eventual publication of the definitive technical guide to map projections entitled Map Projections: A Working Manual among other works. He also authored Flattening the Earth: Two Thousand Years of Map Projections which details the historical development of hundreds of map projections. Snyder developed at least one other projection, called GS50, which uses a complex polynomial to project the 50 U.S. states with minimal distortion. He taught courses on map projection at George Mason University. He was president of the American Cartographic Association (now CaGIS) from 1990–1991 and also served as a secretary to the . John Snyder died April 28, 1997.
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