![]() However, the elevation at the Bhakra dam has submeter level variation when measured using CORONA DEM. The change percentage of elevation is within 1%, between CORONA DEM and ASTER DEM, and TanDEM-X when computed for random 100 points. These profiles match very closely with each other. The CORONA DEM elevation profiles at three different locations were compared with ASTER DEM and TanDEM-X. ASTER DEM and TanDEM-X were used to validate the generated CORONA DEM. In the present work, KH-9 Hexagon CORONA images of Bilaspur district, Himachal Pradesh, India are used for the generation of DEM and orthophoto using photogrammetric techniques and tools. Declassified CORONA images provide stereo pairs that could be used for preparation of Digital Elevation Models (DEMs) and orthophotos that could be an invaluable resource in accounting historical information.
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