USGS Earth Explorer

Managed by the USGS, Earth Explorer is the main home of the Landsat program, providing multi-spectral satellite imagery for monitoring land-surface changes. The platform features an archive of aerial photography, including high-resolution digital frames and historical black-and-white imagery for detailed landscape analysis. It also serves as a key source for global elevation models and NASA-derived products like MODIS and ASTER for tracking vegetation and thermal signatures.

Copernicus

Copernicus offers high-resolution optical and radar imagery captured by the Sentinel satellite missions for continuous global environmental monitoring. Users can download Sentinel-2 data for a detailed land-use study and Sentinel-1 radar images that penetrate cloud cover to visualize the Earth's surface regardless of weather. The platform also features specialized imaging for tracking atmospheric composition, ocean color, and sea-ice movements around the world.