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There are numerous websites that offer free satellite imagery data sources and GIS data. Some of the most popular ones are listed above. You can access a wide range of satellite and aerial imagery data, including Landsat, MODIS, and NAIP from USGS EarthExplorer, while NASA’s Earthdata website provides access to a range of satellite and aerial imagery data, including MODIS, ASTER, and SMOS. The European Space Agency’s Earth Online website provides access to a wide range of satellite imagery data, including Sentinel-1, Sentinel-2, and Sentinel-3. OpenStreetMap offers access to GIS data, such as street maps, land use, and building footprints. You can also obtain GIS data, including topographic maps, imagery, and elevation data from the USGS National Map Viewer. US Census Bureau provides access to a variety of GIS data, including demographic, economic, and housing data. If you’re looking for public domain map data at various scales, you can visit Natural Earth. GADM is a website that provides access to GIS data of administrative boundaries of countries and regions around the world, including shapefiles, KML and GeoJSON formats.
- NASA Earthdata (https://www.earthdata.nasa.gov/) – NASA’s Earthdata website provides access to a wide range of satellite and aerial imagery data, including MODIS, ASTER, and SMOS.
- USGS National Map Viewer (https://www.usgs.gov/the-national-map-data-delivery) – This website provides access to a wide range of GIS data, including topographic maps, imagery, and elevation data.
- ESA Earth Online (https://earth.esa.int/web/guest/data-access) – The European Space Agency’s Earth Online website provides access to a wide range of satellite imagery data, including Sentinel-1, Sentinel-2, and Sentinel-3.
- OpenStreetMap (https://www.openstreetmap.org/) – This website provides access to a wide range of GIS data, including street maps, land use, and building footprints.
- USGS EarthExplorer (https://earthexplorer.usgs.gov/) – This website provides access to a wide range of satellite and aerial imagery data, including Landsat, MODIS, and NAIP.
- US Census Bureau (https://www.census.gov/) – This website provides access to a wide range of GIS data, including demographic, economic, and housing data.
- Natural Earth (https://www.naturalearthdata.com/) – This website provides a wide range of public domain map data at various scales.
- GADM (https://gadm.org/) – This website provides access to GIS data of administrative boundaries of countries and regions around the world, including shapefiles, KML and GeoJSON formats.