Geographic Information System
Image rectification in GIS converts images to a standard map coordinate system. This is done by matching ground control points (GCP) in the mapping system to points in the image. These GCPs calculate necessary image transforms.
Primary difficulties in the process occur
- when the accuracy of the map points are not well known
- when the images lack clearly identifiable points to correspond to the maps.
The maps that are used with rectified images are non-topographical. However, the images to be used may contain distortion from terrain. Image orthorectification additionally removes these effects.
Image rectification is a standard feature available with commercial GIS software packages.
Read more about this topic: Image Rectification
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