Advanced Surveying- Aerial Photogrammetry Part-I

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

2. Photogrammetry- Introduction
►photo = "picture“,
► grammetry = "measurement“, therefore
photogrammetry = “photo-measurement”

9. Aerial Photogrammetry – Aerial photogrammetry is a method of
collecting information by using aerial photograph or remote sensing technology
using electromagnetic spectrum such as infrared, gamma or ultraviolet rays.
Aerial photogrammetry (survey ) can provide information of many things which
are not visible from ground.
Aerial photography (or airborne imagery) is the taking of photographs from an
aircraft or other flying object. Platforms for aerial photography include fixed-
wing aircraft, helicopters, unmanned aerial vehicles (UAVs or "drones"),
balloons, kites etc.
Field Work:- Flying
Photography
Ground control
plotting
Uses:- Land survey
mining
Archeology
Monitoring wild life & inspect population

10. Comparison b/w Maps & Aerial Photogrammetry
Sr
No
Maps Aerial Photogrammetry
1 Takes linear & angular measurements of
terrain
Takes photograph of terrain & showing
all details
2 Elevation of object determine directly by
plotting contour
Elevation of object can not determine
directly
3 Plotting & reading common to users
details of objects shown by sign &
symbols
Aerial photograph views not familiars to
users needs special technique to read
4 Economical uneconomical
5 No confusing details & easily recognizable Confusing details, not easily identified
6 No distortion caused by tilt & relief
displacement
Distortion of details of terrain caused by
tilt & relief displacement

11. Types of aerial Photograph
 Vertical Photograph
 Tilted Photograph (unintentionally tilted)
 Oblique Photograph (Intentionally tilted)
a] Low Oblique
b] High Oblique

14. Vertical Aerial Photograph
• An aerial photograph taken with the camera
axis/optical axis coinciding with the vertical to the
ground is known as vertical photograph.

15. Tilted photograph
• An aerial photograph in which the camera axis is
unintentionally tilted by small amount (less than 3
°) from vertical/perpendicular to the ground is
known as tilted photograph.

16. Oblique photograph
• An aerial photograph taken keeping the camera
axis intentionally tilted from the vertical is known
as oblique aerial photograph. The advantage of
oblique photographs is that they cover large area
and they also provide side view of features.
• Oblique photographs are of two types –
• Low oblique: Oblique photographs in which
horizon is not seen. Tilt is upto30°.
• High oblique: Oblique photographs in which
horizon is seen. Tilt is more than 30° & less than
90°

17. Low oblique High oblique

18. Principle of Aerial survey

20. Definitions

23. Thank you