Updating DEMs using RADARSAT-1 data

TitleUpdating DEMs using RADARSAT-1 data
Publication TypeJournal Article
Year of Publication2004
AuthorsSeymour, M., and I. Cumming
JournalCanadian Journal of Remote Sensing

We present and analyze an algorithm for the production of accurate digital elevation models (DEMs) using interferometric synthetic aperture radar (InSAR). The algorithin requires minimal manual intervention. as a result of using coarse or low-quality DEMs in the InSAR processing stream. The low-quality DEM data are used to estimate the relative geometry (baseline parameters) of the SAR systems. The baseline parameters are estimated during two different stages of InSAR processing: (i) during interferogram conditioning, where the raw interferogram is preconditioned in preparation for phase unwrapping; and (ii) during production of the final InSAR-updated DEM. Analysis of the algorithm shows that the estimated baseline parameters result in an output InSAR DEM with approximately the same mean and trends in range and azimuth as the input DEM. This is achieved because the new algorithm allows the baseline parameters to absorb errors due to offsets and trends in the auxiliary parameters, such as range distance and satellite altitudes. and in the unwrapped phase. We have demonstrated the ability of the algorithm to improve DEMs of various qualities using RADARSAT-1 InSAR dataThe generated DEMs have standard deviations of 12-20 m with respect to a control DEM with an accuracy of 3 m standard deviation. This represents a two to four times improvement in height accuracy compared with the input DENts.

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