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Basics of Geographic Coordinates ESRI Exam Questions and Answers
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Basics of Geographic Coordinates ESRI Exam Questions and Answers
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Basics of Geographic Coordinates ESRIExam Questions and Answers
authalic sphere - Answers -a sphere with the same surface area as an ellipsoid
can be used for small scale maps (1:5 000 000)
ellipsoid - Answers -3d closed shape, all planar sections are ellipses or circles
oblate ellipsoid of revolution - Answers -rotating ellipse about its minor axis (earth)
semi-axes - Answers -used to measure ellipsoids (semi minor = vertical
semi-major=horizontal)
spheroid - Answers -ellipsoid that approximates the shape of a sphere
OR
ellipsoid created by roatating an ellipse about its major axis or minor (prolate or oblate)
for scales smaller than 1: 5 000 000 it can be assumed that the earth is a sphere
Earth's ellipticity - Answers -is approximately 0.003353
degree of flattening
circle=0
line = 1
Clark 1866 - Answers -spheroid for north america (old)
GRS80 - Answers -replacing clark 1866 database
Why can earth not be modeled by a single spheroid - Answers -Because of surface
irregularities, the earth cannot be adequately modeled by a single spheroid. Instead,
different spheroids are applied to different parts of the world to achieve local accuracy.
graticule - Answers -a network of lines representing meridians and parallels, on which a
map or plan can be represented
Latitude and longitude are measured in - Answers -degrees, minutes, and seconds.
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