Earth observation satellite

Earth observationenvironmental satelliteEarth observation satellitesEarth-observing satelliteremote sensing satellitesatelliteEarth observing satelliteEarth-observation satelliteimaging satellitesatellite monitoring
An Earth observation satellite or Earth remote sensing satellite is a satellite used or designed for Earth observation from orbit, similar to spy satellites but intended for non-military uses such as environmental monitoring, meteorology, map making etc.wikipedia
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Satellite

satellitesartificial satelliteartificial satellites
An Earth observation satellite or Earth remote sensing satellite is a satellite used or designed for Earth observation from orbit, similar to spy satellites but intended for non-military uses such as environmental monitoring, meteorology, map making etc.
Common types include military and civilian Earth observation satellites, communications satellites, navigation satellites, weather satellites, and space telescopes.

Reconnaissance satellite

spy satellitereconnaissance satellitesreconnaissance
An Earth observation satellite or Earth remote sensing satellite is a satellite used or designed for Earth observation from orbit, similar to spy satellites but intended for non-military uses such as environmental monitoring, meteorology, map making etc.
A reconnaissance satellite or intelligence satellite (commonly, although unofficially, referred to as a spy satellite) is an Earth observation satellite or communications satellite deployed for military or intelligence applications.

Envisat

MIPASAdvanced Synthetic Aperture RadarPolar Platform
The Earth observation satellites ERS-1, ERS-2 and Envisat of European Space Agency as well as the MetOp spacecraft of EUMETSAT are all operated at altitudes of about 800 km.
Envisat ("Environmental Satellite") is a large inactive Earth-observing satellite which is still in orbit.

European Remote-Sensing Satellite

ERSERS-1ERS-2
The Earth observation satellites ERS-1, ERS-2 and Envisat of European Space Agency as well as the MetOp spacecraft of EUMETSAT are all operated at altitudes of about 800 km.
European remote sensing satellite (ERS) was the European Space Agency's first Earth-observing satellite programme using a polar orbit.

DubaiSat-2

DubaiSat - 2DubaiSat 2
The Earth observation satellites of UAE, DubaiSat-1 & DubaiSat-2 are also placed in Low Earth Orbits (LEO) orbits and providing satellite imagery of various parts of the Earth.
DubaiSat-2 is an electro-optical Earth observation satellite built by the Emirates Institution for Advanced Science and Technology under an agreement with Satrec Initiative, a satellite manufacturing company in South Korea.

Satellite imagery

satellite imagessatellite imagesatellite imaging
The Earth observation satellites of UAE, DubaiSat-1 & DubaiSat-2 are also placed in Low Earth Orbits (LEO) orbits and providing satellite imagery of various parts of the Earth.
Satellite imagery (also Earth observation imagery or spaceborne photography) are images of Earth or other planets collected by imaging satellites operated by governments and businesses around the world.

Earth observation

Earth imagingEarth imagesEarth observation satellite
An Earth observation satellite or Earth remote sensing satellite is a satellite used or designed for Earth observation from orbit, similar to spy satellites but intended for non-military uses such as environmental monitoring, meteorology, map making etc.

Polar orbit

polarpolar-orbitingnear-polar
To get (nearly) global coverage with a low orbit it must be a polar orbit or nearly so.
Polar orbits are often used for Earth-mapping, Earth observation, capturing the Earth as time passes from one point, reconnaissance satellites, as well as for some weather satellites.

Low Earth orbit

Low EarthLEOlow-Earth orbit
The Earth observation satellites of UAE, DubaiSat-1 & DubaiSat-2 are also placed in Low Earth Orbits (LEO) orbits and providing satellite imagery of various parts of the Earth.

Sun-synchronous orbit

Sun-synchronousSSOSun Synchronous
Most are in Sun-synchronous orbits. These types of satellites are almost always in Sun synchronous and "frozen" orbits.
This orbit is also useful for imaging, spy, and weather satellites, because every time that the satellite is overhead, the surface illumination angle on the planet underneath it will be nearly the same.

Radarsat-1

Canadian RADARSAT
Terrain can be mapped from space with the use of satellites, such as Radarsat-1 and TerraSAR-X.
RADARSAT-1 was Canada's first commercial Earth observation satellite.

TerraSAR-X

Terrain can be mapped from space with the use of satellites, such as Radarsat-1 and TerraSAR-X.
TerraSAR-X, an imaging radar Earth observation satellite, is a joint venture being carried out under a public-private-partnership between the German Aerospace Center (DLR) and EADS Astrium.

List of Earth observation satellites

List of climate research satellitessatelliteEarth satellites
Partial list of Earth observation satellites by series/program.

Earth observation satellites transmission frequencies

This article lists a number of current active Earth observation satellites and their downlink transmission frequencies.

Weather satellite

satellitemeteorological satelliteWeather
This type of orbit is mainly used for meteorological satellites.

Frozen orbit

frozenJ3 perturbationneeded an inclination of 63.4°
These types of satellites are almost always in Sun synchronous and "frozen" orbits.
The Earth observation satellites ERS-1, ERS-2 and Envisat are operated in sun-synchronous frozen orbits.

Orbit

orbitsorbital motionplanetary motion
An Earth observation satellite or Earth remote sensing satellite is a satellite used or designed for Earth observation from orbit, similar to spy satellites but intended for non-military uses such as environmental monitoring, meteorology, map making etc.

Natural environment

environmentenvironmentalpaleoenvironment
An Earth observation satellite or Earth remote sensing satellite is a satellite used or designed for Earth observation from orbit, similar to spy satellites but intended for non-military uses such as environmental monitoring, meteorology, map making etc.

Meteorology

meteorologicalmeteorologistmeteorologists
An Earth observation satellite or Earth remote sensing satellite is a satellite used or designed for Earth observation from orbit, similar to spy satellites but intended for non-military uses such as environmental monitoring, meteorology, map making etc.

Cartography

cartographercartographicmapping
An Earth observation satellite or Earth remote sensing satellite is a satellite used or designed for Earth observation from orbit, similar to spy satellites but intended for non-military uses such as environmental monitoring, meteorology, map making etc.

Sputnik 1

SputniksatelliteEarth's first artificial satellite
The first occurrence of satellite remote sensing can be dated to the launch of the first artificial satellite, Sputnik 1, by the Soviet Union on October 4, 1957.

Ionosphere

ionosphericD layerionospheric physics
Sputnik 1 sent back radio signals, which scientists used to study the ionosphere.

Explorer 1

Explorer IExplorerExplorer-1
NASA launched the first American satellite, Explorer 1, in January 31, 1958.

Van Allen radiation belt

Van Allen beltsradiation beltVan Allen belt
The information sent back from its radiation detector led to the discovery of the Earth's Van Allen radiation belts.