Remote sensing

Remote sensing is the process of detecting and monitoring the physical characteristics of an area by measuring its reflected and emitted radiation at a distance (typically from satellite or aircraft). Special cameras collect remotely sensed images, which help researchers "sense" things about the Earth.

History

The concept of remote sensing originated in the mid-20th century with the development of photogrammetry. The technology evolved with the advent of aerial photography, satellite imaging, and radar and sonar systems.

Types of Remote Sensing

Remote sensing can be classified into two types: active and passive.

Active Remote Sensing

Active remote sensing involves the emission of radiation by the sensor itself and the measurement of the energy reflected back. Examples include Lidar and radar.

Passive Remote Sensing

Passive remote sensing involves the measurement of natural energy that is reflected or emitted from the observed scene. Examples include infrared, photographic, and radiometric sensors.

Applications

Remote sensing has a wide range of applications in many fields, including geography, geology, agriculture, environmental science, and military intelligence.

Geography

In geography, remote sensing is used to create detailed maps and to monitor changes in land use and land cover.

Geology

In geology, remote sensing can help identify different types of rocks and soils, and detect changes in the Earth's surface due to natural events such as earthquakes and landslides.

Agriculture

In agriculture, remote sensing is used to monitor crop growth, identify disease outbreaks, and assess drought conditions.

Environmental Science

In environmental science, remote sensing is used to monitor environmental changes, such as deforestation, desertification, and climate change.

Military Intelligence

In military intelligence, remote sensing is used for reconnaissance and surveillance, and to detect and monitor military activities.

See Also

• Geographic Information System
• Satellite Imagery
• Photogrammetry
• Lidar
• Radar
• Sonar

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Remote_sensing

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  Death valley sar

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  Mapping The Future With Landsat

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  Remote Sensing Illustration

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  25cm radar image of Aswan Dam, Egypt from Umbra Lab Inc

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  Deployment of oceanographic research vessels

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  Usaf u2 750pix

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  2001 mars odyssey wizja