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Grog 379

by: Malik Moulton
Malik Moulton
Intro to GIS Systems
Md Shakil B. Kashem

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About this Document

fundamental to cartography and geographic information systems
Intro to GIS Systems
Md Shakil B. Kashem
Class Notes
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This 0 page Class Notes was uploaded by Malik Moulton on Thursday January 28, 2016. The Class Notes belongs to GEOG 379 at University of Illinois at Urbana-Champaign taught by Md Shakil B. Kashem in Spring 2016. Since its upload, it has received 25 views. For similar materials see Intro to GIS Systems in Geography at University of Illinois at Urbana-Champaign.


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Date Created: 01/28/16
Geodesy the science of measuring the shape of the Earth 0 Why geodesy important 0 Measurecontrol distortions on a at map 0 De ne coordinates on irregular shape of earth 0 Minimize locationarea measurement errors Earth s Shape Not at as previously speculated Pythagoras and later Aristotle reasoned a spherical shape Eratosthenes o Performed earliest well founded measurements of earth shape 240 BC 0 Measured the Earth s circumference to be 40250 km 0 Actual circumference 40075 km Posidonius 0 Based on local vertical plumb lines to a star near the horizon 0 Starts de ne a uniform reference 0 Sir Isaac Newton and others reasoned the Earth must be somewhat at due to rotational forces Geoid 0 Surface of the earth s gravity eld 0 Three dimensional surface along which the pull of gravity is a speci ed constant 0 Mathematical model of earth s surface 0 Ellipsoidal height orthometric height geoidal height 0 Measuring Geoid 0 Twin satellites of GRACE experiment in 2002 o ESA GOCE satellite launched in 2009 used precision accelerometers Spheroid and Ellipsoid 0 Both are simpli ed versions of the geoid and the terms are used interchangeably Approximate the shape of the earth 0 Different spheroids do a betterjob of replication the geoid for particular areas


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