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Map makers want to make maps that do three things (amongst others): * Preserve angles – to determine direction of travel * Preserve relative areas – to compare land measurements * Preserve relative distances – to estimate time of travel Unfortunately no map can simultaneous have all three so maps can only approximate the real geometry of a curved surface. Map making, therefore, is a compromise so there are many different named projections. Here are a few. |>> | |>> IMG:Mercator.png _ Mercator _ rhumb lines are represented _ by straight segments | |>> IMG:Strerographic.png _ Stereographic _ shape of circles _ are conserved | | |>> IMG:Hammerprojection.png _ Hammer projection is an _ equal-area map projection | |>> IMG:Conical.png _ Conical Gnomonic projection _ displays all great circles as straight lines. | <<|