NASA Earthdata Search
Web: https://search.earthdata.nasa.gov/
Data Types: Derived Earth science products, land cover, atmosphere, biosphere, cryosphere, etc.
NOAA Data Access Viewer
Web: https://coast.noaa.gov/ (Data Access Viewer)
Data Types: Satellite imagery, aerial imagery, LiDAR (especially for coastal regions)
Vantor Open Data Program
Web: https://vantor.com/company/open-data-program/ (Open Data Program)
Data Types: High-resolution optical (for disaster / emergency events), sample data including true color, stereo, building footprints, elevation
NASA Worldview
Web: https://worldview.earthdata.nasa.gov/
Data Types: Scientific satellite product layers (hazards, climate, atmospheric, disaster) — can download associated data layers (GIS Geography)
NOAA CLASS (Comprehensive Large Array-data Stewardship System)
Web: https://www.aev.class.noaa.gov/saa/products/welcome
Data Types: Oceanic imagery, atmospheric imagery (e.g. GOES, POES), environmental/climate products (aerosols, ozone, etc.)
Bhuvan Indian Geo-Platform (ISRO)
Web: https://bhuvan.nrsc.gov.in
Data Types: Indian satellite imagery (IRS, Cartosat, ResourceSat, OceanSat), NDVI, elevation models (CartoDEM)
JAXA Global ALOS 3D World
Web: eorc.jaxa.jp (ALOS portal)
Data Types: Global DSM / elevation (30 m) via L-band radar (ALOS)
NOAA Digital Coast
Web: https://coast.noaa.gov/digitalcoast/
Data Types: Coastal datasets including imagery, elevation, land cover, radar, infrared, true color composites, and socio-economic data for coastal zones
PROBA-V MEP (GeoViewer)
Web: viewer.probav.vito.be
Data Types: PROBA-V, SPOT-Vegetation, METOP — coarse resolution vegetation / global patterns
Satellite Land Cover (Global Land Cover Facility etc.)
Web: (global land cover data sources via e.g. landsat, MODIS, AVHRR)m
Data Types: Global land cover / land use maps (vegetation, agriculture, urban, hydrology, etc.)
INPE (Brazil’s National Institute for Space Research)
Web: https://www.dgi.inpe.br/catalogo/ (INPE Image Catalog)
Data Types: CBERS satellite imagery (optical), ResourceSat, UK-DMC, other joint mission data (especially for South America & Africa)
Source: gisgeography.com and Mashford Mahute