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[edit | edit source]

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[edit | edit source]

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

Active Remote Sensing[edit | edit source]

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[edit | edit source]

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[edit | edit source]

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

Geography[edit | edit source]

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

Geology[edit | edit source]

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[edit | edit source]

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

Environmental Science[edit | edit source]

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

Military Intelligence[edit | edit source]

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

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