The provider also features free datasets provided in collaboration with ISRO (Resourcesat-1 and 2), ESA (Sentinel-2), and some commercial high-resolution satellite images (IKONOS-2, OrbView-3, historical SPOT data). Using this provider, you will find 40 years’ worth of free satellite images from USGS-NASA Landsat missions and a diversity of data from other NASA remote sensors (Terra and Aqua MODIS, ASTER, VIIRS, etc.). The selection of free satellite imagery in EarthExplorer is overwhelming, from optical and radar data to weather satellite photos to digital elevation maps. The USGS agency has the longest record of collecting free GIS data (free satellite images, aerial, and UAV), which is made available via EarthExplorer (EE). Hide USGS EarthExplorer: Free-To-Use Satellite Imagery Making the Most of Free Imagery Providers.There are also land issues regarding desertification. has water pollution from runoff of pesticides and fertilizers. Much of the western part of the country has limited natural fresh water resources, which requires careful management. There is acid rain resulting from the air pollution of both the U.S. United States Environmental Issues: The United States is the largest single emitter of carbon dioxide from the burning of fossil fuels. In northern Alaska there is permafrost, which is a major impediment to development. Varied other occurrences include volcanoes, and earthquake activity around the Pacific Basin, tsunamis, and forest fires in the western portion of the country. There are hurricanes along the Atlantic and Gulf of Mexico coasts, flooding, mud slides in California, and frequent tornadoes in the midwest and southeast. United States Natural Hazards: The United States has numerous natural hazards. Other natural resources include potash, timber and phosphates. There are a number of metal and metallic resources present, including copper, lead, molybdenum, uranium, bauxite, gold, iron, mercury, nickel, silver, tungsten and zinc. United States Natural Resources: The United States has some fossil fuel deposits of coal, petroleum and natural gas. United States Locations: Appalachian Mountains, Atlantic Ocean, Casacade Mountain Range, Chesapeake Bay, Grat Salt Lake, Gulf of Mexico, Lake Erie, Lake Huron, Lake Michigan, Lake Okeechobee, Lake Ontario, Lake Superior, Lower Red Lake, Mississippi River, Missouri River, Pacific Ocean, Rio Grande, Rocky Mountains, Salton Sea, Straits of Florida and Upper Red Lake. Paul, Tacoma, Tallahassee, Topeka, Trenton, and Washington D.C. United States Cities: Albany, Anchorage, Annapolis, Atlanta, Augusta, Austin, Baton Rouge, Bismarck, Boise, Boston, Carson City, Charleston, Cheyenne, Chicago, Columbia, Columbus, Concord, Denver, Des Moines, Detroit, Dover, Frankfort, Harrisburg, Hartford, Helena, Honolulu, Indianapolis, Jackson, Jefferson City, Lansing, Lincoln, Little Rock, Los Angeles, Madison, Miami, Montgomery, Montpelier, Nashville, New Orleans, New York City, Oklahoma City, Olympia, Philadelphia, Phoenix, Pierre, Providence, Raleigh, Richmond, Sacramento, Salem, Salt Lake City, San Francisco, Santa Fe, Springfield, St. Major lakes are also shown on the map, including the Great Lakes in the northeast, the Great Salt Lake of Utah, and Lake Okeechobee in Florida. You can see numerous rivers running across the country to the Mississippi River Basin, which drains everything from the Rockies in the west to the Appalachians in the east. In the eastern U.S., the Appalachian Mountains trend from New England down to Alabama. Higher elevations are shown in brown and tan, like the Rocky Mountains and Pacific Coast Ranges of the western United States. Physical Map of the United States:This map shows the terrrain of the USA in shaded relief.
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