Lecture05

Lecture05 - Geography 12: Maps and Spatial Reasoning...

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Geography 12: Maps and Spatial Reasoning Lecture 5: Coordinate Systems and Global Grids Professor Keith Clarke
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Coordinate Systems • A coordinate system is a standardized method for assigning codes to locations so that locations can be found using the codes alone • Standardized coordinate systems use absolute locations • A map captured in the units of the paper sheet on which it is printed is based on relative locations or map millimeters • In a coordinate system, the x-direction value is the easting and the y-direction value is the northing. Most systems make both values positive
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A very simple coordinate system
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Advantages of standardization • Can avoid confusion among cities • Cells of grid can be comparable in size • Can be terse • Can have authority • Will work when other reference systems fail • Can be used in positioning systems
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Jourdan Street: Lower 9 th Ward, New Orleans, August 2005
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Coordinates in action
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We’ve already met Geographic Coordinates CLARKE 1866 ELLIPSOID PointA 34 24 20.83000N 119 50 39.93000W PointB 34 25 03.94000N 119 49 8.56000W
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This note was uploaded on 12/27/2011 for the course GEOG 12 taught by Professor Gautier during the Fall '08 term at UCSB.

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Lecture05 - Geography 12: Maps and Spatial Reasoning...

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