Title: DEM-Aided Block Adjustment for Satellite Images With Weak Convergence Geometry
Authors: Teo, Tee-Ann
Chen, Liang-Chien
Liu, Chien-Liang
Tung, Yi-Chung
Wu, Wan-Yu
Department of Civil Engineering
Keywords: Digital elevation model (DEM);direct georeferencing;modified bundle adjustment;rational function model (RFM)
Issue Date: 1-Apr-2010
Abstract: To acquire the largest possible coverage for environmental monitoring, it is important in most situations that the overlapping areas and the convergent angles of respective satellite images be small. The traditional bundle adjustment method used in aerial photogrammetry may not be the most suitable for direct orientation modeling in situations characterized by weak convergence geometry. We propose and compare three block adjustment methods for the processing of satellite images using the digital elevation model (DEM) as the elevation control. The first of these methods is a revised traditional bundle adjustment approach. The second is based on the direct georeferencing approach. The third is a rational function model with sensor-oriented rational polynomial coefficients. A collocation technique is integrated into all three methods to improve the positioning accuracy. Experimental results indicate that using the DEM as an elevation control can significantly improve the geometric accuracy as well as the geometric discrepancies between images. This is the case for all three methods. Moreover, the geometric performance of the three methods is similar. There is a significant improvement in geometric consistency between overlapping SPOT images with respect to single image adjustment for steep areas.
URI: http://dx.doi.org/10.1109/TGRS.2009.2033935
ISSN: 0196-2892
DOI: 10.1109/TGRS.2009.2033935
Volume: 48
Issue: 4
Begin Page: 1907
End Page: 1918
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