Digital photogrammetry
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This document discusses digital photogrammetry. It begins by explaining that digital photogrammetry uses digital images that are stored and processed on a computer, rather than hard copy photos. These digital images can come from satellites, airplanes, or cameras. The document then discusses some applications of digital photogrammetry like topographic mapping and creating orthophotos, digital elevation models (DEMs), and virtual landscapes. It also notes that nadir imagery and image overlap are needed to provide 3D information. Finally, the document lists some common products of digital photogrammetry such as maps, DEMs, and virtual landscapes.
Digital photogrammetry
- 1. Presentation on Presented by Mr .Amol V. Ghogare Assistant Professor, Civil Engineering Dept. SRES, SCOE, Kopargaon .
- 3. In digital photogrammetry input is digital image obtain through scanning hard copy photo or direct taken from Digital camera Digital Photogrammetry-
- 6. Digital Photogrammetry- Introduction Digital photogrammetry is applied to digital images that are stored and processed on a computer. Digital photogrammetry is sometimes called softcopy photogrammetry. The output products are in digital form, such as digital maps, DEMs, and digital or thophotos saved on computer storage media.
- 7. Single or pairs of digital images are loaded into a computer with image processing capabilities. Images may be from satellite or airborne scanners, CCD cameras or are conventional photographs captured by a line scanner. Images are either displayed on the screen for operator interpretation, enhanced by image processing or Digital Photogrammetry
- 8. Applications of Photogrammetery Topographic mapping Creation of value added products: – Ortho images – Digital Elevation Models – Virtual landscapes Nadir imagery is essential for mapping Overlap and sidelap is required to give 3D information
- 9. Different Products of digital Photogrammetry Maps
- 10. DTMs Sources of terrain models – Stereo photogrammetry – Interferometric radar – Stereo radar – Laser scanning – Digitising maps
- 11. Contour digitizing Digital terrain model – Digitizing contour maps Two step procedure: click on the contours, then grid the data Liable to error if the DEM spacing grid is too large
- 12. Contour map
- 15. Thank you