 Hello, this is Hans van der Kwas, Senior Lecturer at IHE Doft Institute for Water Education. In this video, I'm going to demonstrate how to use the Raster Tracer plugin for digitizing rivers. The Raster Tracer plugin is very useful if you have scanned maps and you want to digitize features, line features that are on that map, such as rivers or contour lines or roads. What you do is you take a sample of a color and then the plugin will assist you to quickly digitize those lines. First we go to the Plugins menu and there we activate or install the Raster Tracer plugin that will help us tracing lines with a certain color. So I toggle the rivers dissolve to editing and then in the Raster Tracer I choose the geotift that I want to trace. I click pick color and then I choose one of the colors of the line and then I can immediately start tracing and what you see is that I can quicker digitize it by just putting some points on the line and it will simply trace the color, which will make the digitizing much more precise and quicker. You see this really works nicely. So we can toggle off the editing and then it's saved. So in this video I've demonstrated how the Raster Tracer plugin can be used to trace rivers and speed up the digitizing process. If you like these videos please subscribe to my YouTube channel and if you want to see more free materials you can go to IHE Delft OpenCourseWare on GIS which is at GISOpenCourseWare.org.