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This lecture introduces geodata sources available on the internet, focusing on geoservers and online platforms like OpenStreetMap, Google Maps, and Bing Maps. It covers the client-server architecture, decomposition into tiles, WMS and WFS services, and parametrized HTTP requests. The lecture also explores digital elevation models, satellite imagery sources, and virtual globes. Additionally, it delves into physical and human geography data, including forest cover, population density, and environmental sustainability indices.