Détail de la notice
Titre du Document
Digital terrain model (DTM) from Indian remote sensing (IRS) satellite data from the overlap area of two adjacent paths using digital photogrammetric techniques
Auteur(s)
MALLESWARA RAO T. C. ; VENUGOPALA RAO K. ; RAVI KUMAR A. ; ...
Résumé
Present day needs for medium- and small-scale topographic mapping at reduced cost and time can be met by using stereoscopic digital data acquired by present and planned satellites. In anticipation of the planned IRS-1C stereo data, attempts are made to use the overlap area between two adjacent paths of IRS-1A linear imaging self scanning (LISS)-II data as a stereo pair for generating a digital terrain model (DTM) using digital photogrammetric techniques. Software has been developed to recover the epipolar geometry of the stereo pair and to accomplish automated digital stereo matching to find the corresponding points in the left and right images by correlation techniques to calculate parallax to the sub-pixel level. The parallax is then used in conjunction with the IRS-1A data acquisition system to compute relative elevations. The absolute DTM is generated by referring the relative elevation to a few control points with known Z-coordinates. To evaluate the developed methodology and the software, three test sites at different locations in India near Palghat, Pune, and Dehradun were selected. It is observed that the overlap area between two adjacent paths increases from the equator to the poles whereas the base-to-height ratio (B/H) decreases. A methodology to calculate the percentage of overlap and B/H value at a given latitude is presented. The resultant DTMs for the three test sites were evaluated for error, and it is observed that 90 percent of RMSz errors fall within 33.95
Editeur
American Society for Photogrammetry and Remote Sensing
Identifiant
ISSN : 0099-1112 CODEN : PERSDV
Source
Photogrammetric engineering and remote sensing A. 1996, vol. 62, n° 6, pp. 727-731 [Illustrations : Illustration] [bibl. : 14 ref.]
Langue
Anglais
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