In-Flight CCD Distortion Calibration for Pushbroom Satellites Based on Subpixel Correlation

We describe a method that allows for accurate inflight calibration of the interior orientation of any pushbroom camera and that in particular solves the problem of modeling the distortions induced by charge coupled device (CCD) misalignments. The distortion induced on the ground by each CCD is measu...

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Bibliographic Details
Published in:IEEE transactions on geoscience and remote sensing 2008-09, Vol.46 (9), p.2675-2683
Main Authors: Leprince, S., Muse, P., Avouac, J.-P.
Format: Article
Language:English
Subjects:
Applied geophysics
Calibration
Cameras
Change detection
charge coupled device (CCD) distortions
Charge coupled devices
Charge-coupled image sensors
Correlation
Distortion
Distortion measurement
Earth sciences
Earth, ocean, space
Exact sciences and technology
ground deformations
interior orientation
Internal geophysics
Mathematical models
Mechanical sensors
Optical distortion
orthorectification
pushbroom camera calibration
Satellite Pour l'Observation de la Terre (SPOT)
Satellites
Sensor phenomena and characterization
subpixel correlation
Thermal sensors
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Description
Summary:We describe a method that allows for accurate inflight calibration of the interior orientation of any pushbroom camera and that in particular solves the problem of modeling the distortions induced by charge coupled device (CCD) misalignments. The distortion induced on the ground by each CCD is measured using subpixel correlation between the orthorectified image to be calibrated and an orthorectified reference image that is assumed distortion free. Distortions are modeled as camera defects, which are assumed constant over time. Our results show that in-flight interior orientation calibration reduces internal camera biases by one order of magnitude. In particular, we fully characterize and model the Satellite Pour l'Observation de la Terre (SPOT) 4-HRV1 sensor, and we conjecture that distortions mostly result from the mechanical strain produced when the satellite was launched rather than from effects of on-orbit thermal variations or aging. The derived calibration models have been integrated to the software package Coregistration of Optically Sensed Images and Correlation (COSI-Corr), freely available from the Caltech Tectonics Observatory website. Such calibration models are particularly useful in reducing biases in digital elevation models (DEMs) generated from stereo matching and in improving the accuracy of change detection algorithms.
ISSN:0196-2892
1558-0644
DOI:10.1109/TGRS.2008.918649