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.

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

13. Virtual landscapes

14. Ultimate Surface model

15. Thank you