The Copernicus program is an Earth observation cooperation of the European Union and the European Space Agency (ESA). Sentinels is a family of 2-satellite missions ESA has been developing for the Copernicus programme.
Access to Sentinel data and service information is free, full and open (Legal notice). ESA make Sentinel data available to individuals and entities worldwide through online portals called the Sentinel Data Hubs (Terms and Conditions).
Sentinel-1 data is also available on AWS.
The Landsat program is a joint NASA/USGS program that provides the longest continuous space-based record of Earth's land in existence.
Landsat 8: launched on 2013-02-11, 16 days, 15 m panchromatic, 30 m 8-band, 100 m long-wavelength;
3D Elevation Program (3DEP) products:
The USGS Land Cover Institute (LCI) serves domestic and international land cover data sets to facilitate land cover and land use science. For example, the National Land Cover Database (NLCD) classifies land cover consistently over the US in 21 categories with a resolution of 30 meters.
The German Aerospace Center (DLR), the German counterpart of NASA, is the national aeronautics and space research centre of the Federal Republic of Germany. Its research focuses on five domains: Aeronautics, Space, Energy, Transport, and Security. The Earth Observation Center (EOC) at DLR is allocated to the research domains of Space and Transportation.
Organizational Structure of DLR-EOC:
DFD is predominantly active in the Space - Earth Observation program at DLR, while IMF also receives funding from the Transportation and Aeronautics programs. DFD concentrates on developing applications and services, whereas IMF focuses mainly on image and radar data processing methodologies.
DLR's TanDEM-X satellite mission involves two Synthetic Aperture Radar (SAR) Earth observation satellites, TerraSAR-X and TanDEM-X, which are closely controlled in a formation with typical distances between 250 and 500 m.
WorldDEM is a global digital elevation model (DEM). WorldDEM provides a 12 m x 12 m raster with 2 m relative / 4 m absolute vertical accuracy since 2014, consistently covering the Earth’s entire land surface. The resolution of WorldDEM is unprecedented among global satellite-based DEMs, corresponding to DTED (Digital Terrain Elevation Data) Level 3, i.e. post spacing of better than 12 m.
DigitalGlobe is an American commercial vendor of satellite imagery, founded in January 1992.
DigitalGlobe satellite resolution:
The Group on Earth Observations (GEO) is a global voluntary partnership of member governments and participating organizations, aimed at constructing a Global Earth Observation System of Systems (GEOSS) from 2005 to 2015. GEOSS seeks to connect the producers of Earth observation data and decision-support tools with the end users of these products.
GEO facilitate access to earth observation data in nine priority areas:
Related initiatives: INSPIRE geoportal