New video: Interpolate #groundwater quality data with #QGIS (Thiessen, IDW, kriging). Https://youtu.be/qzV_NaTARIk. Free step-by-step tutorial has been added to the GIS OpenCourseWare platform #gisoc, see https://courses.gisopencourseware.org/course/view.php?id=11. Using these tutorials in #ihedelft MSc courses this month.