This video tutorial shows how to create an Inverse Distance Weighted (IDW) interpolated raster from a spreadsheet file containing sampled points dispersed around N.W England in the UK. It uses QGIS and shows how to generate a final map complete with Legend, Title, Scalebar and North arrow. QGIS can be downloaded here (https://qgis.org/en/site/). The country SHAPE file of the UK (or any other country) can be downloaded here (http://www.divagis.org/gdata). The spreadsheet containing the sample data for this exercise can be downloaded here (http://www.ukscience.org/NumParticles....