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Image processing is a set of techniques that have been developed over the years for the enhancement or semiautomated analysis of remotely sensed imagery. These techniques can work on panchromatic images but are more highly developed for color, multispectral, and hyperspectral imagery. Imagery is an essential source of data used in GIS, and it is important for all GIS users to understand how that imagery is processed before it becomes part of the analytical database. Image processing techniques usually fall into three categories: geometric correction, image enhancement, and pattern recognition. The functions that exist within each of the categories are discussed in this entry.

Geometric Correction

Images captured by aircraft or satellite sensors are rarely geometrically corrected. What this means is that the imagery, whether interpreted or ...

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