UW-Madison GEOG 370 - Projections (5 pages)

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This lecture includes the basics of map projections

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Lecture Note
University of Wisconsin, Madison
Geog 370 - Introduction to Cartography

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ECON 370 1st Edition Lecture 2 Outline of Last Lecture I What is a map a Defining the map b Reference versus thematic mapping c All maps lie II But what makes a map a map Mapicity III What is cartography cartographic dichotomies Outline of Current Lecture II Map Projections III Map projection mechanics IV Map projection distortions Current Lecture Map projections from a round earth to a flat map o Background geodesy and the geographic coordinate system Geodesy the science and practice of earth measurement with the goal of accurately precisely describing the surface of the earth Geoid magnetic sphere of earth No necessary information but good background to know Coordinate system a system of units used to specify locations on a description of the earth Geographic coordinate system a system of specifying locations on the earth i e a coordinate system that is based on principles of spherical geometry If not familiar with this read chapter 7 These notes represent a detailed interpretation of the professor s lecture GradeBuddy is best used as a supplement to your own notes not as a substitute Geographic coordinates 2 Latitude the angular distance in degrees of a position on the earth north or south of the equator o A line of latitude is called a parallel as it does not intersect any other lines of latitude Approximately equal spaced Parallels run east west Parallels are measured in north south Longitude the angular distance in degrees of a position on the earth east or west of a fixed origin the prime meridian o A line of longitude is called a meridian with all meridians intersecting at both the north and south poles The distance of 1 degree longitude depends on the latitude o Meridians run north south o Meridians are measured east west o Measuring longitude with an chronometer 15 degrees longitude equates to one hour of time 360 degrees 24 hours 15 degrees hour Graticule the coordinate system imposed on the earth based on the network of meridians and parallels Great

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