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Photogrammetry
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A Study on Digital Orthophoto Generation of Mount Everest Region
Table 1, Characteristics of data sets available for Mount Everest-digital orthophoto project.
| Project Name | Mount Everest |
| Scene Content | Open, snow covered | |
| Scene topography | Steep to very Steep | Most rugged terrain |
| Image Scale | 1:50.000 | Large variation in Scale |
| Camera | Wild RC 30 | GPS onboard |
| Focal Length | 153.19 mm | Calibrated |
| Flight Date | Nov-Dec, 1992 | |
| Film Material | Panchromatic (B/W) | |
| Number of Images | 93=30*90 sq. km | 47 used |
| Overlap | l=80%, q= 40% | |
| Scanner used | Photo Scan 2001 | ZI Imaging’s Product |
| Scanned pixel size | 14 um and 12 bits depth | Per image=728MB |
| Scanned Material | Positive Film | |
| Scanned Channel | Panchromatic | |
| Scan Date | August 2001 | |
| Source | Mount Everest, Nepal | Survey Department |
3. Procedures:
3.1 Aerial Triangulation:
First of all aerial images available in hard film copy were scanned using PhotoScan 2001.The results of scanning were 14um pixel size in resolution, 12 bits CCD data output and full set of overviews. The disk space occupied by one image data came to be 728 MB. These data were loaded to run automatic image matching process. A commercial software called ImageStation Automatic Aerial Triangulation (ISAT 2001 version 3.2-provided by Zeiss-Intergraph Imaging GmbH), was used to perform the automatic orientation of the input images for orthorectification. The final results of this is exterior orientation parameters of the images to be rectified.
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