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Satellite Imaging Corporation (SIC) provides orthorectification processing services for satellite image data affected by systematic sensor and platform-induced geometry errors.
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Terrain distortions are introduced when the satellite sensor is not pointing directly at the Nadir location. Terrain displacement can be hundreds of meters. For example, if theacquires image data over an area with a kilometer of vertical relief, with the sensor having an elevation angle of 60° (30° from Nadir), the image product will have nearly 600 meters of terrain displacement.
IKONOS Satellite Image Orthorectification
Click on image to view Orthorectification animation
IKONOS (0.8m) Satellite Image
(Image Copyright © DigitalGlobe and processed by Satellite Imaging Corporation)
When unorthorectified Satellite Imagery is used in a mapping or GIS environment and features are digitized, vector data produced can have considerable distortions and cannot be adjusted with a "Bulk" shift.
Additional terrain displacement can result from errors in setting the reference elevation. Low elevation angles of images, imperfect terrain models, and variability of sensor azimuth and elevation angles within an image limit accuracy potential if image orthorectification is attempted. For this reason, when new satellite image data is acquired over rough terrain, high elevation angles of the sensor is required.
The topographical variations in the surface of the earth and the tilt of the satellite affect the distance with which features on the satellite image are displayed. The more topographically diverse the landscape, the more distortion inherent in the Satellite Image.
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