GGR272H1 Lecture Notes - Lecture 4: Data Acquisition, Geographic Coordinate System, Geodetic Datum

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We take this for granite and there is various ways to describe said location w/ diff accuracy. To start to understand how to describe location, we can think of earth as a. : sphere (perfectly round) w/ longitude and latitude, ellipsoid w/ horizontal datum, and geographic coordinate system, geoid w/ vertical datum. Working answer: angular unit of measurement to describe measurement. Graticule: grid created by the longitude and latitude. Bad at showing distance across the surface of the earth because moving up/down shows different distances in terms of the sphere and can make it hard to see the distance in degrees. Latitude (marked by parallel): imaginary lines around the earth parallel to the equator. Longitude (marked by meridian): agreed line from the north pole to greenwich, Recorded w/ decimal degrees (dd) (earth in 4 quadrants) Always record x before y = 120 w, 25 n. Differences in speed over different location over long period time (physical forces)

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