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GIS Fundamentals, 2nd Edition by Stephen Wise

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Chapter 7

Raster Data Structures

In Chapter 2, we saw that using a raster GIS we could store a set of spatial data in the form of a grid of pixels. Each pixel will hold a value which relates to some feature of interest at that point in space. In fact, there are two main types of raster layer which are used in GIS:

  • Raster imagery. These days we are surrounded by imagery in digital format - modern televisions and computers all have screens in which the picture is composed of pixels and the photographs we all take on our cameras and phones are in a raster format. We are also used to seeing maps and satellite images used on web pages and even on phones. In all these cases, what is stored is a raster grid of colours, coded in some numerical fashion. ...

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