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section-data.html
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section-data.html
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<!DOCTYPE html>
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<title>mapschool: Data: a free introduction to geo</title>
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<h1><a href='./'>mapschool: Data</a></h1>
<p>a free introduction to geo.</p>
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<p>Fundamentally, geographical data is either <strong>raster</strong> or <strong>vector</strong> - composed of pixels, or of geometry. The two types are often combined, like when vector road data is overlaid over raster satellite data.</p>
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