Friday, February 12, 2010

A Tale of Three Projections



The task this week was to take one shapefile and re-project it from the original to two other systems, then calculate the area of four counties.
It was emphasized in the reading assignment that there are errors associated with all projections, due to the difficulty of transforming an 'oblate elipsoid' onto a flat surface. It was not surprising that the calculated ares of the four counties varied. Each projection has a different base reference point, and the farther from that point, the greater the distortion.

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