GEO 121 1st Edition Lecture 6 I I II Outline of Last Lecture Projections Robinson Projection Types of Survey Systems Outline of Current Lecture I Review of Maps a Maps Need b Lines of Longitude and Latitude II Topographic Maps a Special Parallels and Meridians b Contour Lines Current Lecture Review of Maps Maps need o Scales to express distance 1 24 000 is a common valueless ratio o Legends to differentiate data o North arrow there can be 3 N Arrows o Lines of latitude and longitude o A title o A date Lines of latitude and longitude o Measured in degrees minutes seconds o Lines of latitude are called parallels o Lines of longitude are called meridians o The Prime Meridian is at 0 degrees o The International Date Line is at 180 degrees E W Topographic Maps Special Parallels and Meridians o 90 North Arctic Circle o 90 South Artic Circle o 180 E W International Date Line o 23 N Tropic of Cancer o 23 S Tropic of Capricorn Contour Lines o Type of iso line o Connects points of equal elevation o The closer the lines the more steep the elevation
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