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TitleThree-dimensional topographic mapping with ASTER stereo data in rugged topography
DownloadDownloads (Preprint)
LicencePlease note the adoption of the Open Government Licence - Canada supersedes any previous licences.
AuthorToutin, T
SourceIEEE Transactions on Geoscience and Remote Sensing (Institute of Electrical and Electronics Engineers) vol. 40, issue 10, 2002 p. 2241-2247, Open Access logo Open Access
Alt SeriesEarth Sciences Sector, Contribution Series 20043016
PublisherInstitute of Electrical and Electronics Engineers (IEEE)
Mediapaper; on-line; digital
File formatpdf
Subjectsremote sensing; mapping techniques; Digital Elevation Model (DEM); ASTER
Illustrationsdiagrams; tables; graphs; histograms
AbstractDEM were generated from a stereo pair using ASTER backward and nadir images with 27.7° intersection angles (B/H=0.6) over a high relief area, the Rocky Mountains in Canada. 15 GCPs is a good compromise to compute the stereo bundle adjustment when they are only 25-30 m precise to avoid their error propagation in the modelling. It enables to keep accuracy in the order of one pixel (15 m). DEM accuracy was then evaluated along the full process and as a function of different parameters. By applying CCD calibration in order to reduce the striping effects, it improves the DEM accuracy with a factor of 10%. The major problems in the image matching were the clouds, snow, lakes and occlude/shadowed areas, which generate mismatched areas and artificialrelief in the lakes (1000-2000 m) during the correlation process and the automatic interpolation method. Post-processing the DEM with semi-automatic 3D tools improves its accuracy with a factor of 10%. The final results (LE68 and LE90 of 28 m and 51 m, respectively) were obtained with the interactive correction of lake elevations, but without taking into account the large mismatched areas, which are specific to this challenging mountainous study site. The final results demonstrated that the DEM is almost-linearly correlated with the terrain slopes, and 20-m LE68 can be obtained on a medium topography. BRDF and local topography effects should then be corrected on the ASTER stereo-images to improve DEM extraction in an iterative processing method.

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