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WorksheetsBasic Photogrammetry
Total questions: 13
Worksheet time: 7mins
What is Photogrammetry?
Photogrammetry is the art, science, and technology of obtaining reliable information about physical objects and the environment through processes of recording, measuring, and interpreting photographic images and patterns of electromagnetic radiant energy and other phenomena
Photogrammetry is the technique, profession, art and science of determining the terrestrial or three-dimensional positions of points and the distances and angles between them
Photogrammetry is the is a framework for gathering, managing, and analyzing data. Rooted in the science of geography, gis integrates many types of data
Photogrammetry is the is the study and practice of making maps. Combining science, aesthetics, and technique, cartography builds on the premise that reality can be modeled in ways that communicate spatial information effectively.
What is Aerial Photogrammetry?
the scanning of the earth by satellite or high-flying aircraft in order to obtain information about it
used to describe survey techniques using photographs taken from the air or from space.
taking photos and combine to make orthophoto
have the information such as scale and focal length
List two techniques of aerial photogrmmetry:
Elavation
Surveying
Aerial
Terrestrial
Give two advantages using photogrammetry:
Covers large area
Weather dependent
Easy to interpret and understand
Costly at the time of installation/initiation
Give two disadvantages using photogrammetry:
Less time consumtion/ fast
Can ‘reach’ inaccessable and restricted area
Heavy and sophisticated equipment needed
Lengthy administration procedure for getting permission to fly
Type of Aerial Photograph:
Fiducial Mark
Oblique
Vertical
Camera Axis
State the characteristics of Low Oblique:
It does not show the horizon
It covers a very large area
Relief may be quite discernible but distorted as in any oblique view.
It covers a relatively small area
State the characteristics of High Oblique:
No scale is applicable to the entire photograph, and distance cannot be measured.
The view varies from the very familiar to unfamiliar, depending on the height at which the photograph is taken.
It covers a very large area
Relief is discernible but distorted
2 main factors of scale variation
Cover area
Variable terrain
Distance of the principle point
Tilt of photographs
Define to find the Scale of a Vertical Aerial Photograph over Variable Terrain
S = f / (H + h)
S = f * (H - h)
S = f / (H - h)
S = f * (H + h)
Define f, S, H, PP:
Focal Point, Scale, Height, Principle Point
Focal Point, Scale, Flying Height, Principle Point
Focal length, Scale, Height, Principle Point
Focal length, Scale, Altitude above ground level, Principle Point
What is the formula of Scale by Comparing Real Object Size versus Photographic Image Size?
Scale = f/H
Scale = F/H
Scale = f/h
Scale = H/f
A camera with a 152 mm focal length takes an aerial photograph from a flying height of 2280m above ground level. What is the scale of the photograph?
Scale = 1: 10000
Scale = 1: 20000
Scale = 1: 11300
Scale = 1: 15000
