1.
NASA
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President Dwight D. Eisenhower established NASA in 1958 with a distinctly civilian orientation encouraging peaceful applications in space science. The National Aeronautics and Space Act was passed on July 29,1958, disestablishing NASAs predecessor, the new agency became operational on October 1,1958. Since that time, most US space exploration efforts have led by NASA, including the Apollo Moon landing missions, the Skylab space station. Currently, NASA is supporting the International Space Station and is overseeing the development of the Orion Multi-Purpose Crew Vehicle, the agency is also responsible for the Launch Services Program which provides oversight of launch operations and countdown management for unmanned NASA launches. NASA shares data with various national and international such as from the Greenhouse Gases Observing Satellite. Since 2011, NASA has been criticized for low cost efficiency, from 1946, the National Advisory Committee for Aeronautics had been experimenting with rocket planes such as the supersonic Bell X-1. In the early 1950s, there was challenge to launch a satellite for the International Geophysical Year. An effort for this was the American Project Vanguard, after the Soviet launch of the worlds first artificial satellite on October 4,1957, the attention of the United States turned toward its own fledgling space efforts. This led to an agreement that a new federal agency based on NACA was needed to conduct all non-military activity in space. The Advanced Research Projects Agency was created in February 1958 to develop technology for military application. On July 29,1958, Eisenhower signed the National Aeronautics and Space Act, a NASA seal was approved by President Eisenhower in 1959. Elements of the Army Ballistic Missile Agency and the United States Naval Research Laboratory were incorporated into NASA, earlier research efforts within the US Air Force and many of ARPAs early space programs were also transferred to NASA. In December 1958, NASA gained control of the Jet Propulsion Laboratory, NASA has conducted many manned and unmanned spaceflight programs throughout its history. Some missions include both manned and unmanned aspects, such as the Galileo probe, which was deployed by astronauts in Earth orbit before being sent unmanned to Jupiter, the experimental rocket-powered aircraft programs started by NACA were extended by NASA as support for manned spaceflight. This was followed by a space capsule program, and in turn by a two-man capsule program. This goal was met in 1969 by the Apollo program, however, reduction of the perceived threat and changing political priorities almost immediately caused the termination of most of these plans. NASA turned its attention to an Apollo-derived temporary space laboratory, to date, NASA has launched a total of 166 manned space missions on rockets, and thirteen X-15 rocket flights above the USAF definition of spaceflight altitude,260,000 feet. The X-15 was an NACA experimental rocket-powered hypersonic research aircraft, developed in conjunction with the US Air Force, the design featured a slender fuselage with fairings along the side containing fuel and early computerized control systems
2.
United States Geological Survey
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The United States Geological Survey is a scientific agency of the United States government. The scientists of the USGS study the landscape of the United States, its resources. The organization has four science disciplines, concerning biology, geography, geology. The USGS is a research organization with no regulatory responsibility. The USGS is a bureau of the United States Department of the Interior, the USGS employs approximately 8,670 people and is headquartered in Reston, Virginia. The USGS also has major offices near Lakewood, Colorado, at the Denver Federal Center, the current motto of the USGS, in use since August 1997, is science for a changing world. The agencys previous slogan, adopted on the occasion of its anniversary, was Earth Science in the Public Service. Prompted by a report from the National Academy of Sciences, the USGS was created, by a last-minute amendment and it was charged with the classification of the public lands, and examination of the geological structure, mineral resources, and products of the national domain. This task was driven by the need to inventory the vast lands added to the United States by the Louisiana Purchase in 1803, the legislation also provided that the Hayden, Powell, and Wheeler surveys be discontinued as of June 30,1879. Clarence King, the first director of USGS, assembled the new organization from disparate regional survey agencies, after a short tenure, King was succeeded in the directors chair by John Wesley Powell. Administratively, it is divided into a Headquarters unit and six Regional Units, Other specific programs include, Earthquake Hazards Program monitors earthquake activity worldwide. The National Earthquake Information Center in Golden, Colorado on the campus of the Colorado School of Mines detects the location, the USGS also runs or supports several regional monitoring networks in the United States under the umbrella of the Advanced National Seismic System. The USGS informs authorities, emergency responders, the media, and it also maintains long-term archives of earthquake data for scientific and engineering research. It also conducts and supports research on long-term seismic hazards, USGS has released the UCERF California earthquake forecast. The USGS National Geomagnetism Program monitors the magnetic field at magnetic observatories and distributes magnetometer data in real time, the USGS operates the streamgaging network for the United States, with over 7400 streamgages. Real-time streamflow data are available online, since 1962, the Astrogeology Research Program has been involved in global, lunar, and planetary exploration and mapping. USGS operates a number of related programs, notably the National Streamflow Information Program. USGS Water data is available from their National Water Information System database
3.
Orbital Sciences Corporation
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It was headquartered in Dulles, Virginia and publicly traded on the New York Stock Exchange with the ticker symbol OA. Orbital also provided satellite subsystems and space-related technical services to government agencies and laboratories, on April 29,2014, Orbital Sciences announced that it would merge with Alliant Techsystems to create a new company called Orbital ATK, Inc. The merger was completed on February 9,2015 and Orbital Sciences ceased to exist as an independent entity, Orbital was founded and incorporated in 1982 by three friends who had met earlier while at Harvard Business School—David W. Thompson, Bruce Ferguson and Scott Webster. In 1985, Orbital procured its first contract for providing up to four Transfer Orbital Stage vehicles to NASA, in 1987, the seeds for the ORBCOMM constellation were planted when Orbital began investigating a system using Low Earth orbit satellites to collect data from remote locations. In 1988, Orbital acquired Space Data Corporation in Arizona- one of the leading suppliers of suborbital rockets- thereby broadening its rocket business. This was followed by the opening of a new facility in Chandler, in 1990, the company successfully carried out eight space missions, highlighted by the initial launch of the Pegasus rocket, the worlds first privately developed space launch vehicle. Shortly following the successful Pegasus launch, Orbital conducted an IPO in 1990, in 1993, Orbital established its current headquarters in Dulles, Virginia followed by the acquisition of Fairchild Space and Defense Corporation in 1994. In the same year, Orbital successfully conducted the launch of the Taurus rocket. In the early 2000s, Orbital continued expanding its missile defense systems business with a $900 million award to develop, build, test and support interceptor booster vehicles. In 2006 Orbital conducted its 500th mission since the founding with a diverse portfolio of products that included satellites, launch vehicles. Orbital is currently on-track to deliver on this contract with its Cygnus spacecraft and Antares rocket following the success of Cygnus Orb-D1, the new company will be called Orbital ATK, Inc. and will serve U. S. Orbital was a provider of small- to medium-class satellites, since the companys founding in 1982, Orbital has delivered 150 spacecraft to commercial, military and civil customers worldwide. To date, these spacecraft have amassed well over 1000 years of on-orbit operations, the Communications & Imaging Satellites developed by Orbital are smaller and more affordable. Earth imagery and high resolution digital imaging satellites such as the OrbView series are developed and manufactured by Orbital. In the last 10 years, Orbital has built more scientific, Orbitals space launch vehicles are considered the industry standard for boosting small payloads to orbit. The Minotaur ground-launched rockets combine Pegasus upper stages with either government-supplied or commercially available first-stage rocket motors to boost larger payloads to orbit, Minotaur IV combines decommissioned Peacekeeper rocket motors with proven Orbital avionics and fairings to provide increased lifting capacity for government-sponsored payloads. With the development of the Antares space launch vehicle, Orbital is extending its capabilities to provide launch services for U. S. government. The inaugural launch of Antares occurred on April 21,2013 from Wallops Flight Facility at Wallops Island, Orbital is also a major provider of suborbital target and interceptor launch vehicles for the U. S. missile defense systems
4.
Goddard Space Flight Center
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The Goddard Space Flight Center is a major NASA space research laboratory established on May 1,1959 as NASAs first space flight center. GSFC employs approximately 10,000 civil servants and contractors, and is located approximately 6.5 miles northeast of Washington, D. C. in Greenbelt, Maryland, United States. GSFC, one of ten major NASA field centers, is named in recognition of Dr. Robert H. Goddard, GSFC is a major U. S. laboratory for developing and operating unmanned scientific spacecraft. GSFC conducts scientific investigation, development and operation of space systems, Goddard scientists can develop and support a mission, and Goddard engineers and technicians can design and build the spacecraft for that mission. Mather shared the 2006 Nobel Prize in Physics for his work on COBE, past missions managed by GSFC include the Rossi X-ray Timing Explorer, Compton Gamma Ray Observatory, SMM, COBE, IUE, and ROSAT. Goddard is NASAs first, and oldest, space center and its original charter was to perform five major functions on behalf of NASA, technology development and fabrication, planning, scientific research, technical operations, and project management. The center is organized into directorates, each charged with one of these key functions. Until May 1,1959, NASAs presence in Greenbelt, Maryland was known as the Beltsville Space Center and it was then renamed the Goddard Space Flight Center, after Dr. Robert H. Goddard. Goddard Space Flight Center contributed to Project Mercury, Americas first manned flight program. The Center assumed a role for the project in its early days and managed the first 250 employees involved in the effort. However, the size and scope of Project Mercury soon prompted NASA to build a new Manned Spacecraft Center, now the Johnson Space Center, in Houston, Project Mercurys personnel and activities were transferred there in 1961. However, the Center focused primarily on designing unmanned satellites and spacecraft for research missions. Goddard pioneered several fields of development, including modular spacecraft design. Goddards Solar Max satellite, launched in 1980, was repaired by astronauts on the Space Shuttle Challenger in 1984. The Hubble Space Telescope, launched in 1990, remains in service and continues to grow in capability thanks to its modular design, today, the center remains involved in each of NASAs key programs. Goddard has developed more instruments for planetary exploration than any other organization, Goddards partly wooded campus is a few miles northeast of Washington, D. C. in Prince Georges County. The center is on Greenbelt Road, which is Maryland Route 193, baltimore, Annapolis, and NASA Headquarters in Washington are 30–45 minutes away by highway. Greenbelt also has a station with access to the Washington Metro system
5.
Atlas V
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Atlas V is an active expendable launch system in the Atlas rocket family. Atlas V was formerly operated by Lockheed Martin, and is now operated by the Lockheed Martin-Boeing joint venture United Launch Alliance, the RD-180 engines are provided by RD Amross, while Aerojet Rocketdyne provides both the RL10 engines and the strap-on boosters used in some configurations. The standard payload fairing sizes are 4 or 5 meters in diameter, fairings sizes as large as 7.2 m in diameter and up to 32.3 m in length have been considered. The rocket is assembled in Decatur, Alabama and Harlingen, Texas, the Atlas V was developed by Lockheed Martin Commercial Launch Services as part of the US Air Force Evolved Expendable Launch Vehicle program and made its inaugural flight on August 21,2002. The vehicle operates out of Space Launch Complex 41 at Cape Canaveral Air Force Station, Lockheed Martin Commercial Launch Services continues to market the Atlas V to commercial customers worldwide. The Atlas V first stage, the Common Core Booster, is 12.5 ft in diameter and 106.6 ft in length and it is powered by a single Russian RD-180 main engine burning 627,105 lb of liquid oxygen and RP-1. The booster operates for four minutes, providing about 4 meganewtons of thrust. Thrust can be augmented with up to five Aerojet strap-on solid rocket boosters, the Atlas V is the newest member of the Atlas family. Compared to the Atlas III vehicle, there are numerous changes, compared to the Atlas II, the first stage is a near-redesign. The 1.5 staging technique was dropped on the Atlas III, the RD-180 features a dual-combustion chamber, dual-nozzle design and is fueled by a kerosene/liquid oxygen mixture. The main-stage diameter increased from 10 feet to 12.5 feet, as with the Atlas III, the different mixture ratio of the engine called for a larger oxygen tank compared to Western engines and stages. The first stage no longer use stainless steel monocoque balloon construction. The tanks are aluminum and are structurally stable when unpressurized. Use of aluminum, with a thermal conductivity than stainless steel. The tanks are covered in a polyurethane-based layer, accommodation points for parallel stages, both smaller solids and identical liquids, are built into first stage structures. The Centaur upper stage uses a pressure stabilized propellant tank design, the inertial navigation unit located on the Centaur provides guidance and navigation for both the Atlas and Centaur, and controls both Atlas and Centaur tank pressures and propellant use. The Centaur engines are capable of multiple in-space starts, making possible insertion into low Earth parking orbit, followed by a coast period, a subsequent third burn following a multi-hour coast can permit direct injection of payloads into geostationary orbit. The standard payload fairing sizes are 4 or 5 meters in diameter, the 4. 2-meter fairing, originally designed for the Atlas II booster, comes in three different lengths, the original 9-meter high version, as well as fairings 10 meters and 11 meters high
6.
Vandenberg Air Force Base
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Vandenberg Air Force Base is a United States Air Force Base 9.2 miles northwest of Lompoc, California. It is under the jurisdiction of the 30th Space Wing, Air Force Space Command, Vandenberg AFB is a Department of Defense space and missile testing base, with a mission of placing satellites into polar orbit from the West Coast using expendable boosters. Wing personnel also support the Services LGM-30G Minuteman III Intercontinental Ballistic Missile Force Development Evaluation program, in addition to its military mission, the base also leases launch pad facilities to SpaceX, as well as 100 acres leased to the California Spaceport in 1995. Established in 1941, the base is named in honor of former Air Force Chief of Staff General Hoyt Vandenberg, the host unit at Vandenberg AFB is the 30th Space Wing. The 30th SW is home to the Western Range, manages Department of Defense space and missile testing, Wing personnel also support the Air Forces Minuteman III Intercontinental Ballistic Missile Force Development Test and Evaluation program. The Western Range begins at the boundaries of Vandenberg and extends westward from the California coast to the Western Pacific. Operations involve dozens of federal and commercial interests, the wing is organized into operations, launch, mission support and medical groups, along with several directly assigned staff agencies. 30th Launch Group The 30th Launch Group is responsible for booster and satellite technical oversight and launch processing activities to launch, integration. The group consists of a military, civilian and contractor team with more than 250 personnel directly supporting operations from the Western Range. 1st Air and Space Test Squadron 4th Space Launch Squadron 30th Operations Group The 30th Operations Group provides the capability for West Coast spacelift. Operations professionals are responsible for operating and maintaining the Western Range for spacelift, missile test launch, aeronautical, 30th Mission Support Group The 30th Mission Support Group supports the third largest Air Force Base in the United States. It is also responsible for quality-of-life needs, housing, personnel, services, civil engineering, contracting, 30th Medical Group The 30th Medical Group provides medical, dental, bio-environmental and public health services for people assigned to Vandenberg Air Force Base, their families and retirees. It is Vandenbergs only National Historic Landmark that is open for scheduled tours through the 30th Space Wings Public Affairs office. The current display area is made up of two exhibits, the Chronology of the Cold War and the Evolution of Technology, there are plans to evolve the center in stages from the current exhibit areas as restorations of additional facilities are completed. In 1941 the United States Army sought more and better training centers for the development of its armored. In March 1941, the Army acquired approximately 86,000 acres of open ranch lands along the Central Coast of California between Lompoc and Santa Maria, most of the land was purchased. Smaller parcels were obtained either by lease, license, or as easements, with its flat plateau, surrounding hills, numerous canyons, and relative remoteness from populated areas, the Army was convinced it had found the ideal training location. Construction of the Army camp began in September 1941, although its completion was still months away, the Army activated the camp on 5 October, and named it Camp Cooke in honor of Major General Phillip St. George Cooke
7.
United Launch Alliance
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United Launch Alliance is a joint venture of Lockheed Martin Space Systems and Boeing Defense, Space & Security. ULA was formed in December 2006 by combining the teams at these companies which provide spacecraft launch services to the government of the United States, U. S. government launch customers include both the Department of Defense and NASA, as well as other organizations. With ULA, Lockheed and Boeing held a monopoly on military launches for more than a decade, until the US Air Force awarded a GPS satellite contract to SpaceX in 2016. Beginning in October 2014, ULA announced that they intended to undertake a substantial restructuring of the company, its products and processes, ULA is planning on building a new rocket that will be a successor to the Atlas V, using a new rocket engine on the first stage. In April 2015, they unveiled the new vehicle as the Vulcan, Boeing and Lockheed Martin announced their intent to form the United Launch Alliance joint venture on May 2,2005. ULA had a peak of seven space launch facilities during 2005–2011 and it announced a consolidation to five in 2008 with the intent to close two of its three Delta II pads, and closed the two-pad launch complex at Cape Canaveral after its final Delta II launch in 2011. SpaceX challenged the United States antitrust law legality of the launch services monopoly on October 23,2005, SpaceX was interested in competing for government launch contracts with the Falcon 9 rocket. The FTC gave their anti-trust clearance on October 3,2006, in November 2010, United Launch Alliance was selected by NASA for consideration for potential contract awards for heavy lift launch vehicle system concepts, and propulsion technologies. It was announced in August 2014 that Michael Gass, ULA CEO since ULA was founded in 2006, would step down immediately, ULA announced in February 2015 that they are considering undertaking domestic production of the Russian RD-180 engine at the Decatur, Alabama rocket stage manufacturing facility. The US-manufactured engines would be used only for government civil or commercial launches, Aerojet Rocketdyne Holdings Inc submitted a $2 billion offer to purchase the joint venture on September 8,2015. According to industry officials, the bid, if successful, would create a unified leadership for the company. On September 16,2015, spokesperson Todd Blecher for joint owner Boeing commented that Aerojet Rocketdynes bid was never seriously entertained and rejected the offer, in October 2014, ULA announced a major restructuring of processes and workforce in order to decrease launch costs by half. One of the reasons given for the restructuring and new cost reduction goals was competition from SpaceX. ULA intends to have preliminary design ideas in place for a blending of the Atlas V and Delta IV technology by the end of 2014, to build a successor that will allow them to cut launch costs in half. CEO Tory Bruno stated in November 2014 that he intends to transform the company and reorganize it to make it more agile, and establish new business models to adapt to the new environment. These changes will lead to improvements in how ULA interacts with its customers, ULA intends to shrink the number of company launch pads from six in 2008 and five in 2015 to only two by 2021 as they ramp down the legacy Atlas V and Delta IV launch vehicles. In May 2015, ULA announced it would decrease its executive ranks by 30 percent in December 2015, the management layoffs are the beginning of a major reorganization and redesign as ULA endeavours to slash costs and hunt out new customers to ensure continued growth despite the rise of SpaceX. In May 2015, ULA stated that it would go out of business unless it won commercial and civil satellite launch orders to offset an expected slump in U. S. military and spy launches
8.
United States
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Forty-eight of the fifty states and the federal district are contiguous and located in North America between Canada and Mexico. The state of Alaska is in the northwest corner of North America, bordered by Canada to the east, the state of Hawaii is an archipelago in the mid-Pacific Ocean. The U. S. territories are scattered about the Pacific Ocean, the geography, climate and wildlife of the country are extremely diverse. At 3.8 million square miles and with over 324 million people, the United States is the worlds third- or fourth-largest country by area, third-largest by land area. It is one of the worlds most ethnically diverse and multicultural nations, paleo-Indians migrated from Asia to the North American mainland at least 15,000 years ago. European colonization began in the 16th century, the United States emerged from 13 British colonies along the East Coast. Numerous disputes between Great Britain and the following the Seven Years War led to the American Revolution. On July 4,1776, during the course of the American Revolutionary War, the war ended in 1783 with recognition of the independence of the United States by Great Britain, representing the first successful war of independence against a European power. The current constitution was adopted in 1788, after the Articles of Confederation, the first ten amendments, collectively named the Bill of Rights, were ratified in 1791 and designed to guarantee many fundamental civil liberties. During the second half of the 19th century, the American Civil War led to the end of slavery in the country. By the end of century, the United States extended into the Pacific Ocean. The Spanish–American War and World War I confirmed the status as a global military power. The end of the Cold War and the dissolution of the Soviet Union in 1991 left the United States as the sole superpower. The U. S. is a member of the United Nations, World Bank, International Monetary Fund, Organization of American States. The United States is a developed country, with the worlds largest economy by nominal GDP. It ranks highly in several measures of performance, including average wage, human development, per capita GDP. While the U. S. economy is considered post-industrial, characterized by the dominance of services and knowledge economy, the United States is a prominent political and cultural force internationally, and a leader in scientific research and technological innovations. In 1507, the German cartographer Martin Waldseemüller produced a map on which he named the lands of the Western Hemisphere America after the Italian explorer and cartographer Amerigo Vespucci
9.
Satellite
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In the context of spaceflight, a satellite is an artificial object which has been intentionally placed into orbit. Such objects are called artificial satellites to distinguish them from natural satellites such as Earths Moon. In 1957 the Soviet Union launched the worlds first artificial satellite, since then, about 6,600 satellites from more than 40 countries have been launched. According to a 2013 estimate,3,600 remained in orbit, of those, about 1,000 were operational, the rest have lived out their useful lives and become space debris. Approximately 500 operational satellites are in orbit,50 are in medium-Earth orbit. A few large satellites have been launched in parts and assembled in orbit. Over a dozen space probes have been placed into orbit around other bodies and become artificial satellites to the Moon, Mercury, Venus, Mars, Jupiter, Saturn, a few asteroids, Satellites are used for many purposes. Common types include military and civilian Earth observation satellites, communications satellites, navigation satellites, weather satellites, Space stations and human spacecraft in orbit are also satellites. Satellite orbits vary greatly, depending on the purpose of the satellite, well-known classes include low Earth orbit, polar orbit, and geostationary orbit. A launch vehicle is a rocket that throws a satellite into orbit, usually it lifts off from a launch pad on land. Some are launched at sea from a submarine or a mobile maritime platform, Satellites are usually semi-independent computer-controlled systems. Satellite subsystems attend many tasks, such as power generation, thermal control, telemetry, attitude control, the first fictional depiction of a satellite being launched into orbit was a short story by Edward Everett Hale, The Brick Moon. The idea surfaced again in Jules Vernes The Begums Fortune, in 1903, Konstantin Tsiolkovsky published Exploring Space Using Jet Propulsion Devices, which is the first academic treatise on the use of rocketry to launch spacecraft. He calculated the speed required for a minimal orbit. In 1928, Herman Potočnik published his book, The Problem of Space Travel — The Rocket Motor. He described the use of orbiting spacecraft for observation of the ground, in a 1945 Wireless World article, the English science fiction writer Arthur C. Clarke described in detail the possible use of communications satellites for mass communications. He suggested that three geostationary satellites would provide coverage over the entire planet, the first artificial satellite was Sputnik 1, launched by the Soviet Union on October 4,1957, and initiating the Soviet Sputnik program, with Sergei Korolev as chief designer. This in turn triggered the Space Race between the Soviet Union and the United States, Sputnik 1 helped to identify the density of high atmospheric layers through measurement of its orbital change and provided data on radio-signal distribution in the ionosphere
10.
Landsat program
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The Landsat program is the longest-running enterprise for acquisition of satellite imagery of Earth. On July 23,1972 the Earth Resources Technology Satellite was launched and this was eventually renamed to Landsat. The most recent, Landsat 8, was launched on February 11,2013, the instruments on the Landsat satellites have acquired millions of images. Landsat 7 data has eight spectral bands with spatial resolutions ranging from 15 to 60 meters, Landsat images are usually divided into scenes for easy downloading. Each Landsat scene is about 115 miles long and 115 miles wide, Hughes Santa Barbara Research Center initiated, designed, and fabricated the first three Multispectral Scanners in 1969, the same year man landed on the moon. The first prototype MSS was completed nine months, in the fall of 1970. It was tested by scanning Half Dome at Yosemite National Park, the program was initially called the Earth Resources Technology Satellites Program, which was used from 1966 to 1975. In 1975, the name was changed to Landsat and this occurred in 1985 when the Earth Observation Satellite Company, a partnership of Hughes Aircraft and RCA, was selected by NOAA to operate the Landsat system with a ten-year contract. EOSAT operated Landsat 4 and Landsat 5, had rights to market Landsat data. In 1989, this transition had not been completed when NOAAs funding for the Landsat program was due to run out. The head of the newly formed National Space Council, Vice President Dan Quayle, noted the situation and arranged emergency funding that allowed the program to continue with the data archives intact. Again in 1990 and 1991, Congress provided only half of the funding to NOAA. In 1992, various efforts were made to procure funding for follow on Landsats and continued operations, Landsat 6 was finally launched on October 5,1993, but was lost in a launch failure. Processing of Landsat 4 and 5 data was resumed by EOSAT in 1994, NASA finally launched Landsat 7 on April 15,1999. Timeline Landsat missions 1 through 5 carried the Landsat Multispectral Scanner and this construct ensured the secondary mirror would simply oscillate about the primary optic axis to maintain focus despite vibration inherent from the 360 mm beryllium scan mirror. This engineering solution allowed the United States to develop LANDSAT at least five years ahead of the French SPOT and this was a direct result of the commercialization efforts begun under the Carter administration, though finally completed under the Reagan administration. This main plate was assembled on a frame, then attached to the magnesium housing with helicoil fasteners. Key to the success of the multi spectral scanner was the scan monitor mounted on the underbelly of the magnesium housing, the beam struck the beryllium scan mirror seven times as it reflected seven times off the flat mirrors
11.
Greenbelt, Maryland
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Greenbelt is a city in Prince Georges County, Maryland, United States. Contained within todays City of Greenbelt is the planned community now known locally as Old Greenbelt. Greenbelts population was 23,068 at the 2010 U. S. Census, Greenbelt is known widely as a public cooperative community founded in the New Deal Era. Greenbelt was one of three green towns planned in 1935 under the United States Resettlement Administration, along with Greendale, Wisconsin and Greenhills, Greenbelt is located at 39°0′2″N 76°53′18″W. According to the United States Census Bureau, the city has an area of 6.34 square miles. Greenbelts ZIP codes are 20768,20770, and 20771, the National Aeronautics and Space Administrations Goddard Space Flight Center is located in Greenbelt, as is Greenbelt Park, a unit of the National Park System. Two major highways pass through and have interchanges in Greenbelt, the Capital Beltway, Greenbelt Road is a portion of State Highway 193, which connects several suburban towns. Kenilworth Avenue traverses Greenbelt in a North-South direction, Washington Metro rapid transit rail service from Washington, D. C. serves Greenbelt Metro Station, the northern terminus of the systems Green Line. Beltsville Agricultural Research Center Berwyn Heights College Park Goddard Lanham New Carrollton Glenn Dale Old Greenbelt was settled in 1937 as a cooperative community in the New Deal Era. Construction of the new town would create jobs and thus help stimulate the national economic recovery following the Great Depression. Working alongside Tugwell was Charles W. Yost, the two other green towns are Greendale, Wisconsin and Greenhills, Ohio. A fourth green town, Roosevelt, New Jersey, was planned but was not fully developed on the large scale as Greenbelt. Eleanor Roosevelt, wife of President Franklin D. Roosevelt, helped Tugwell lay out the Maryland town on a site that had formerly consisted largely of tobacco fields. The architectural planning of Greenbelt was innovative, but no less so than the engineering involved in this federal government project. Applicants for residency were interviewed and screened based on income and occupation, African-Americans were initially excluded, but were later included by the Greenbelt Committee for Fair Housing founded in 1963, and came to number 41% of residents according to the 2000 census. Much of the community is now located within the Greenbelt Historic District, Greenbelt was the subject of the 1939 documentary film The City. As of the census of 2010, there were 23,068 people,9,747 households, the population density was 3,673.2 inhabitants per square mile. There were 10,433 housing units at a density of 1,661.3 per square mile
12.
Remote sensing
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Remote sensing is the acquisition of information about an object or phenomenon without making physical contact with the object and thus in contrast to on-site observation. It may be split into active remote sensing and passive remote sensing, passive sensors gather radiation that is emitted or reflected by the object or surrounding areas. Reflected sunlight is the most common source of radiation measured by passive sensors, examples of passive remote sensors include film photography, infrared, charge-coupled devices, and radiometers. Active collection, on the hand, emits energy in order to scan objects and areas whereupon a sensor then detects. RADAR and LiDAR are examples of remote sensing where the time delay between emission and return is measured, establishing the location, speed and direction of an object. Remote sensing makes it possible to data of dangerous or inaccessible areas. Remote sensing applications include monitoring deforestation in areas such as the Amazon Basin, glacial features in Arctic and Antarctic regions, military collection during the Cold War made use of stand-off collection of data about dangerous border areas. Remote sensing also replaces costly and slow data collection on the ground, the basis for multispectral collection and analysis is that of examined areas or objects that reflect or emit radiation that stand out from surrounding areas. For a summary of major remote sensing satellite systems see the overview table, conventional radar is mostly associated with aerial traffic control, early warning, and certain large scale meteorological data. Other types of active collection includes plasmas in the ionosphere, interferometric synthetic aperture radar is used to produce precise digital elevation models of large scale terrain. Laser and radar altimeters on satellites have provided a range of data. By measuring the bulges of water caused by gravity, they map features on the seafloor to a resolution of a mile or so, by measuring the height and wavelength of ocean waves, the altimeters measure wind speeds and direction, and surface ocean currents and directions. Ultrasound and radar tide gauges measure sea level, tides and wave direction in coastal, light detection and ranging is well known in examples of weapon ranging, laser illuminated homing of projectiles. Vegetation remote sensing is an application of LIDAR. Radiometers and photometers are the most common instrument in use, collecting reflected and emitted radiation in a range of frequencies. The most common are visible and infrared sensors, followed by microwave, gamma ray and rarely and they may also be used to detect the emission spectra of various chemicals, providing data on chemical concentrations in the atmosphere. Simultaneous multi-spectral platforms such as Landsat have been in use since the 1970s and these thematic mappers take images in multiple wavelengths of electro-magnetic radiation and are usually found on Earth observation satellites, including the Landsat program or the IKONOS satellite. Landsat images are used by agencies such as KYDOW to indicate water quality parameters including Secchi depth, chlorophyll a density
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