A government agency is a permanent or semi-permanent organisation in the machinery of government that is responsible for the oversight and administration of specific functions, such as an intelligence agency. There is a notable variety of types of agency. Although usage differs, a government agency is normally distinct both from a Department or Ministry, and other types of public body established by government. The functions of an agency are normally executive in character since different types of organisation (such as commissions) are normally used for advisory functions, but this distinction is often blurred in practice.
A government agency may be established by either a national government or a state government within a federal system. (The term is not normally used for an organisation created by the powers of a local government body.) Agencies can be established by legislation or by executive powers. The autonomy, independence and accountability of government agencies also vary widely.

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Australian Centre for Remote Sensing - Australia's Earth resources satellite data receiving, processing and archiving facility
Mississippi Space Commerce Initiative - Joint project between State of Mississippi, NASA, Stennis Space Center, Mississippi universities and GIS Technology Businesses to promote remote sensing research and industry in Mississippi.
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NASA - Earth Science Applications Directorate - NASA remote sensing and geoinformation products derived from advanced remote sensing technologies with links to tutorials.
NASA Earth Observatory - Explore the causes and effects of climatic and environmental change through the use of real satellite data.
Meta Description: [ Welcome to NASA's Earth Observatory, where you can monitor regional and global changes on our planet almost as they happen. Here you can explore with NASA scientists the causes and effects of climatic and environmental change through the use of real satellite data. ]
NASA Earth Observing System - EOS - EOS consists of a science component and a data system supporting a coordinated series of polar-orbiting and low inclination satellites for long-term global observations of the land surface, biosphere, solid Earth, atmosphere, and oceans.
Meta Description: [ The Earth Observing System (EOS) is a coordinated series of polar-orbiting and low inclination satellites for long-term global observations of the land surface, biosphere, solid Earth, atmosphere, and oceans. EOS is a major component of the Earth Science Division of NASA's Science Mission Directo... ]
National Imagery and Mapping Agency (NIMA) - NIMA provides imagery, imagery intelligence and geospatial information in support of the nation's military forces and national policy makers and civil users.
Meta Description: [ NGA provides timely, relevant, and accurate geospatial intelligence in support of national security. ]
National Operational Hydrologic Remote Sensing Center - National Weather Service (NWS) center of expertise in satellite and airborne remote sensing and geographic information systems (GIS) to support the NWS operational hydrology program. Provides remotely sensed and GIS hydrology products, GIS applications and spatial data sets.
Remote Sensing Research at the Lunar and Planetary Institute - Research activities at the Lunar and Planetary Institute in reflectance spectroscopy and thermal infrared spectroscopy of Mars and Earth.
Meta Description: [ This site describes research activities at The Lunar and Planetary Institute and The Aerospace Corporation in reflectance spectroscopy and thermal infrared spectroscopy of Mars and Earth, for NASA and the DoD/Intell communities. ]
Synthetic Aperture Radar -- Sandia National Laboratories - Sandia National Laboratories is a world leader in Synthetic Aperture Radar. This site includes a variety of SAR imagery, movies and information.
Meta Description: [ Sandia National Laboratories is a world leader in analyzing, designing and building high performance Microwave Imaging Radar systems, including Synthetic Aperture Radar. ]
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