Correction of Geometric Distortions in

Line Scanner Imagery

Peter A. Kopacz

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Abstract 

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A Line Scanner is an electro-optical imaging instrument that remotely senses and collects ground data. Such a sensor is commonly found on airborne or spaceborne platforms. Images acquired by the sensor reflect certain geometric distortions. Some of these distortions are caused by the geometry of the sensor and platform motion.

It is desirable to remove geometric distortions from the acquired imagery prior to qualitative or quantitative interpretation. This research focuses on the most significant of these distortions -- roll, tangent, and V/H. A library of C algorithms has been implemented to remove the above mentioned distortions from the imagery. These algorithms are based on the sensor characteristics and information collected during the flight. Evaluation of the correction algorithms has been performed on synthetic imagery modeling an airborne line scanner. These initial test images were created with DIRSIG (Digital Imaging and Remote Synthetic Image Generator). The final phase of the validation will apply the algorithms to real imagery collected with the MISI (Modular Imaging Spectrometer Instrument) line scanner. From a scientific perspective, a sensitivity analysis has been performed on the involved flight parameters to identify potential sources of error.
 
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