A free (CC licensed) book about the fundamentals of Geographical Information Systems.
This is a (very) abridged version of the Libro Libre SIG (only available at the moment in spanish)
The book uses LaTeX. LaTeX sources are found in the latex folder, with subfolders for each available language.
To create the HTML and EPUB versions, run the convert.py script in the convert folder.
On-line version available at http://volaya.github.io/gis-book/