This document discusses stereoscopy and parallax measurement in aerial photography. Stereoscopy uses two photographs of the same ground area taken from separate positions to create a stereo pair that enables three-dimensional viewing. Parallax is the displacement of an object caused by a change in the point of observation. Stereoscopic parallax occurs when photographs are taken of the same object from different positions, allowing measurement of differences in elevation.

1. Presentation
on
Presented by
Mr .Amol V. Ghogare
Assistant Professor, Civil Engineering Dept.
SRES, SCOE, Kopargaon
.

3. Distance between principal point of adjacent photographs is known as the “air
base”

4. Stereoscopy
Stereoscopy, sometimes called stereoscopic
imaging, is a technique used to enable a three-
dimensional effect
In aerial photography, when two photographs
overlap or the same ground area is photographed
from two separate position forms a stereo-pair,
used for three dimension viewing.
Thus obtained a pair of stereoscopic photographs or
images can be viewed stereoscopically to determine
parallax and stereo/3D viewing.

6. Parallax Measurement
Parallax:
The displacement of an
object caused by a change
in the point of observation
is called parallax.
Stereoscopic parallax is
caused by taking
photographs of the same
object but from different
points of observation.

9. Difference in Elevation

10. Thank you