Earth Observer is a spatial data directory that helps users discover geospatial datasets through an indexed, searchable catalog. Its collection spans a wide range of subjects and sources, including administrative boundaries, land cover, elevation and bathymetry, climate, soils, water resources, ecosystems, biodiversity, population, infrastructure, transportation, and natural hazards. The directory lists well-known resources such as Natural Earth, Landsat, SRTM, HydroSHEDS, GEBCO, WorldCover, and the IUCN Red List, alongside specialized and regional datasets.

Earth Observer’s catalog is organized into dataset categories, with entries covering global, national, and local information. These resources can support applications such as mapping, environmental research, conservation, urban and infrastructure planning, climate analysis, and disaster risk assessment. The site also provides introductory and quick-start sections to help visitors begin exploring its data index. The available information presents Earth Observer as a discovery resource for geospatial data rather than as the creator or provider of every listed dataset; individual datasets are associated with a variety of organizations and projects.