PHOTOGRAMMETRIC ANALYSIS OF AIRCRAFT MULTISPECTRAL SCANNER DATA

JAMES CHRISTOPHER MCGLONE, Purdue University

Abstract

The purpose of this investigation is the photogrammetric study of the geometric properties of aircraft multispectral scanner data. The research involves three areas; the use of Gauss-Markov processes in single strip rectification procedures, the use of spatial block adjustment techniques with multiple sidelapping strips, and the implementation of object space geometric constraints into aircraft MSS restitution algorithms. The research into Gauss-Markov processes involves the study of the theoretical nature of the processes and their application in a rigorous and efficient manner to aircraft MSS data restitution. Comparisons of the results using first and second order Gauss-Markov processes show that the second order process gives results equal to or slightly worse than those of the first order, while taking more execution time. The first order Gauss-Markov is therefore chosen as the optimum method. The spatial block adjustment algorithm was implemented using the collinearity technique, constrained segmentation of strips, a priori weighting of parameters and constraints, and complete editing and evaluation statistics. Tests were conducted, using three sidelapping strips of data, to compare single and multiple strip adjustments, to determine the effect of constrained segmentation of the strips, and to evaluate the determinancy of the (omega) and (phi) orientation parameters. It is concluded that constrained segmentation does have a beneficial effect and that the determination of points by the use of multiple sidelapping strips, is more accurate than using only one ray. Inclusion of the (omega) parameter improves the accuracy, although high correlations result among the orientation parameters. Due to the lack of terrain relief in the data set used, the (phi) parameter was not recoverable. The mathematical basis for the use of object space straight line constraints is developed and their application outlined. Tests using single strips show that accuracy and precision of points on the line are greatly improved, with some improvements for other points in the adjustment. It is possible to use the straight line constraints in place of elevation assignment for single ray points. The use of straight line constraints also improved the results of multiple strip adjustments.

Degree

Ph.D.

Subject Area

Civil engineering

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