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Geometric Correction

  • By: Sunhui Sim
  • In: Encyclopedia of Geography
  • Edited by: Barney Warf
  • Subject:General Geography, Earth & Environmental Science

Geometric correction is the preprocessing method of removing positional distortions in remotely sensed data caused by the movement of the sensor. Unrectified images contain distortions in their planimetric (x, y) map locations due to variations in sensor parameters (altitude, attitude, and velocity), in the Earth's curvature, and in remote sensing systems. Geometric correction seeks to eliminate these distortions and to transform the image into a map projection system, so that the image could be used as a map and integrated with other thematic information and other maps.

Sources of Geometric Distortions

Geometric distortions are typically classified into (a) internal distortion resulting from the geometry of the sensor and Earth rotation or curvature characteristics and (b) external distortions resulting from the attitude of the sensor or the shape ...

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