Sentinel-2

Sentinel-2, a two-satellite constellation operated by ESA under the Copernicus programme, captures 13-band multispectral imagery at 10-20m resolution with a combined 5-day revisit, freely available with no registration through the Copernicus Data Space Ecosystem, AWS, and Google Earth Engine. Its 2015-present archive is now long enough for multi-year change detection.

Most of the higher-level products in this collection — WorldCover, Dynamic World, JRC surface water updates — are built on Sentinel-2 underneath. For custom analysis (bespoke NDVI, flood-extent mapping from a specific event, turbidity screening), the raw imagery itself is often the better starting point than a pre-classified product.