One of the most frequent difficulties we encounter when doing any data visualisation work is data availability. Other than national government data sources – that may or may not be available at your location –, there are global data sources that come in handy. There are several repositories of free, public, open data on the Internet these days.
For anyone looking to access data that is georeferenced, i.e., that you can map, there is an updated list in this GISGeography article: 10 Free GIS Data Sources: Best Global Raster and Vector Datasets .
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