The document presents an outline of aerial photogrammetry, defining it as an advanced technique for obtaining information about objects or areas without physical contact. It discusses objectives such as mapping, reconnaissance, military intelligence, and environmental assessments, and distinguishes between terrestrial and aerial photogrammetry based on investment, technical skill, and land size. The document also compares maps with aerial photographs and describes types of aerial photographs, including vertical, tilted, and oblique orientations.

1. Advance Surveying
Aerial Photogrammetry
Prof. Rajguru R.S.
Civil Engineering Department
(rajgururajeshcivil@sanjivani.org.in)
Sanjivani College of Engineering,
Kopargaon,MH,India

2. Lecture Outline
 Definition
 Objectives
 Classification: quantitative and qualitative
photogrammetry Application
 Comparison of map and aerial photograph
 Vertical, Tilted and Oblique photograph

3.  Definition of Aerial Photogrammetry:
Aerial Photogrammetry is advance technique of
obtaining the information about object or area
without coming into the physical contact with the
object or area under investigation.
Photo=Picture
Grammetry =Measurement
Photogrammetry= Photo-measurement

4.  Objectives:
• To prepare the maps
• To make the reconnaissance survey
• To collect the military intelligence
• To interpret the geology and soil data
• To make survey of remote area
• To make survey of buildings
• To conduct environmental assessment
• To conduct Power line inspection
• To conduct forest survey
• Movie production

5.  Classification:
Sr. No. Terrestrial photogrammetry Aerial photogrammetry
1
2 Photographs are taken by photo
theodolite mounted at stationary
and elevated position.
Cameras fit to an aeroplane that flies
take pictures
3 Terrestrial photogrammetry
comparatively needs much less
investment and technical skill to
carry out.
Aerial photogrammetry requires a
high-end infra support:
4 To map a small piece of land. To map a large piece of land.
5 Maps are compiled from the
photographs
Accessories required for
interpretation & plotting the maps

6.  Comparison of map and aerial photograph:
Sr. No. Map Aerial photogrammetry
1
2 It is an orthogonal Projection. It is a central Projection
3 A map is a geometrically correct. An aerial photograph is a geometrically
incorrect.
4 The scale of the map is uniform The scale of the photograph is not
uniform
5 Enlargement/reduction of the maps
involves redrawing it
Enlargement/reduction does not change
the contents of the photographs
6 Map reading is common and more
familiar to users
Photograph needs a special technique to
read the photo-views
7 Plotting of map is economical Plotting of map is uneconomical
8 Map Prepared by conventional
method
Aerial Photograph preparation is highly
skill job
9 Time consuming method Time saving method

7.  Types of Photographs: Vertical , Tilted & Oblique
Types of aerial photographs on the basis of orientation of
camera axis:
• Vertical photograph: An aerial photograph taken with the camera
axis/optical axis coinciding with the vertical to the ground is known as
vertical photograph.
• 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.

8. • Oblique photograph:
An aerial photograph taken keeping the camera axis intentionally tilted from
the vertical is known as oblique aerial photograph. The amount of tilt ranges
from 30° to 60 °. 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 30°.
High oblique: Oblique photographs in which horizon is seen. Tilt is 30° to 60°.

9. Thank you