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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>map school: Raster: a free introduction to geo</title>
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<meta name="description" content='a brief introduction to map and geospatial concepts'>
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<div class='header'>
<h1><a href='./'>map school: Raster</a></h1>
<p>a free introduction to geo.</p>
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<a href='https://github.com/tmcw/mapschool'>code</a><a
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<p><img src="img/raster.png" alt=""></p>
<p><strong>Raster</strong> data is like a picture that you would take with a digital camera: at the lowest level of abstraction, it is a list of pixels with values. When you 'zoom in' and look closer at raster data, at some point you'll see these discrete pixels, and it will look pixelated.</p>
<p>Raster data is used in pictures of the earth, like those taken by satellites - but that is just the beginning. Pixels don't need to have colors - instead, each pixel can have a number that represents height and the raster data as a whole stores elevation data. Or pixels can store temperature or reflection data and be useful for environmental work.</p>
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