This page from the GeoTech Center provides a link to an introductory textbook on Geographic Information Systems, or GIS. The textbook is freely available online. The text covers a general introduction to GIS, vector data, vector attribute data, data capture, raster data, topology, coordinate reference systems, map production, vector spatial analysis (buffers) and spatial analysis (interpolation). The text is 99 pages long; users may navigate the content via handy links in the book's table of contents.
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