My name is John Lindsay, a professor of Geography at the University of Guelph, in Canada. My research interests include geomorphometry (digital terrain analysis), applications of LiDAR, surface flowpath modelling, and spatial analysis more generally. I am also a keen supporter of open-source geographical information systems (GIS). Over the last several years, I have been the lead developer of a cross-platform free and open-source GIS called Whitebox Geospatial Analysis Tools. This blog highlights some of the interesting developments and applications of Whitebox GAT. Feel free to leave comments and if you have any question, send me an email.