Geography 2122A/B Chapter Notes - Chapter 4: Map Projection, Grid Cell, Military Grid Reference System
16 Apr 2013
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Document Summary
A plane-rectangular coordinate system based upon and mathematically placed on a map projection is called a grid coordinate system. Horizontal x-axis and vertical y-axis, where the axes cross at the systems origin. Pinpoint any location on the map precisely and objectively by giving its two coordinates (x,y) Mapmakers use only quadrant i for grid coordinate systems, therefore, all coordinates are positive numbers. Simplifies locating environmental features as do not have to deal with the decreasing separation between meridians converging toward the pole. Finding the distance or direction between locations or determining the area of a mapped feature like a lake. Universal transverse mercator system: international scope, extends around the world from 84degree n to 80 degree s, sixty north-south zones used. This value is called false easting > added to x-coordinates so there are no negative eastings zone: northing is the north, northing value of 0mn is assigned to the equator so that all northings are positive numbers.
