I have written a fundamentals of mapping and GIS in the Fourth Edition of Key Methods of Geography textbook, published by Sage Publications. If you are seeking a single chapter about what GIS is and why it matters, this might very well fit that need. Beyond my chapter, the book contains a great deal of pertinent content about, as the title indicates, key core methods essential for the geographic sciences, including field data collection equipment and methods, statistical analysis, spatial analysis, remote sensing, and much more.
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