Within the book the Geographic Information System (GIS) we use for handling remote sensing data is Quantum (QGIS).  QGIS is a piece of open-source software, which means it is freely available. QGIS is regularly updated, and this will mean that the version that you might download today is not the same version as we used in the book.

For the first edition (2016), we based the exercises on QGIS version 2.8.1 (Wein), which was closest to the current long term release (LTR, version 2.8.3) that’s recommended for corporate users. Since then, new releases have occurred and so the second edition (2023) used 3.22 (Bialowieza) that was the current LTR at the time we wrote the book.