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TitleProcessing Stereo Imagery From Line Imagers
AuthorGibson, J R
SourceCanadian Symposium on Remote Sensing, Proceedings, 9th, St. John's, Nfld., August 14-17; 1984 p. 471-487
Alt SeriesEarth Sciences Sector, Contribution Series 20040524
Alt SeriesRESORS 1050047
AbstractThe Canada Centre for Remote Sensing (CCRS) has embarked on a project to develop a processing system for electro-optical line imager data. The system follows the general lines of a photography based bundle adjustment. An essential element in the system, however, is the inclusion of aircraft position and attitude data and laser range measurements from the aircraft to the terrain below. The position and attitude data are derived from an inertial sensor package and the laser ranging system utilized has an operational flying height of 10 km above ground with a 2 milliradian beam divergence and a 20 Hz pulse repetition rate. By processing all of the data source in a simultaneous least-squares adjustment, the systematic errors of the inertial data may be removed. Ground control data is obtained for the adjustment of the imagery by scanning photographs containing surveyed targets or landmarks whose position bas been established in previous photogrammetric adjustments.

Some of the potential advantages of an electro-optical line imager system include the following: The radiometric properties of electro-optical devices are superior to those of utilized in classification algorithms. The imagery is generated directly in digital format which is convenient for automated processing. Completely digital systems would have the advantage of not requiring the expensive and restrictive optical trains and electro-mechanical motion and measuring devices found in modern photogrammetric instruments.

The system will be capable of handling both side-to-side and fore/aft stereo line imager data. Some preliminary results obtained by processing the navigation system and laser range data from a test flight during which side-to-side MSS data was acquired are shown to illustrate the effect of aircraft motion. In addition, some preliminary results of image matching processing for fore/aft stereo are illustrated which also show the effect of aircraft motion. Finally, a sample of the MSS side-to-side stereo imagery is shown, both before and after geometric correction processing to illustrate the correction process. No results are available at this time for the complete bundle adjustment processing.


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