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WorksheetsPhotogrammetry
Total questions: 70
Worksheet time: 35mins
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
If the data's CRS is WGS 1984, can we compute for a polygon's area (i.e. sqm, ha, sqkm)?
No
Sometimes
Yes
Maybe
In UTM coordinate system, the Northing is referenced from
Prime Meridian
Equator
Apparels
Parallels
In UTM, the reference for the Easting is the False Central Meridian (FCM) which is valued at:
0 meter
300,000 meters
10,000,000 meters
500,000 meters
Photogrammetry can be used for
Engineering tasks
Forensic invesigation
Heritage recording
All of the above
Photogrammetry can be used to
check the weight of an object
measure the temperature of an object
compare the colour of two surfaces
verify the size and shape of an object
Photogrammetry systems are highly portable, and are often used when large objects can not be moved.
True
False
HISTORY!!!
Niepce takes first picture of nature from a window view of the french countryside using a camera obscura and an emulsion using bitumen of judea, a resinous substance, and oil of lavender (it took 8 hours in bright sunlight to produce the image)
1839
1840
1827
1849
Father of Photogrammetry
(a)
In the Philippines, Photogrammetry started in _______ as an alternative to conventional survey methods used in large scale projects such as forestry and cadastral surveys.
1945
1954
1964
1966
Monophotogrammetry involves the use of single photographs taken one at a time.
TRUE
FALSE
Stereophotogrammetry uses more than one overlapping photographs know as stereopairs.
TRUE
FALSE
Digital Elevation Model is a digital representation of topographic surface with the elevation of ground height above any geodetic datum.
TRUE
FALSE
Digital Terrain Model is a digital representation of terrain features including elevation, slope, aspect, drainage and other terrain attributes.
TRUE
FALSE
Topographic maps are a detailed record of a land area, giving geographic positions and elevations for both natural and man-made features.
TRUE
FALSE
In Aerial Photogrammetry, photographs are taken from the air using various objects/vehicles such as balloons, kites, helicopters, or twin engine airplane.
TRUE
FALSE
In Terrestrial Photogrammetry the axis of the camera is vertical
TRUE
FALSE
In terrestrial Photogrammetry, photographs are taken near or at the surface of the earth using a phototheodolite.
TRUE
FALSE
in 1903, the Bavarian Pigeon Corps. Small light weight cameras were attached to the pigeons and a timer was set to take pictures every 30 seconds as it flew.
TRUE
FALSE
in 1906 a Kite was used to take aerial photo of San Francisco.
TRUE
FALSE
In Analytical Photogrammetry the 3D model us mathematical and measurements are made in the 3D images?
TRUE
FALSE
In DIgital Photogrammetry the analytical solutions applied in digital images can also incorporate computer vision and digital image processing techniques.
TRUE
FALSE
What is the recommended minimum requirement for target size?
1 millimeter at any distance
any size target will work
1 millimeter per meter
10 millimeters per meter
What Apex angle (angle between cameras) produces the small error or best results?
360 degrees
45 degrees
10 degrees
90 degrees
A lens with a smaller aperture produces greater depth of focus
True
False
A narrow field of view, telephoto lens is better suited to photogrammetry
True
False
What is the minimum number of photos required for triangulation?
1
2
3
4
When a photograph is taken directly downwards this is a...
Vertical Photograph
Oblique Photograph
Aerial photograph is a _____ from an airplane or other flying objects.
drawing
photo
What type of aerial photo is this image?
High Oblique
Vertical
Low Oblique
What type of aerial photo is this image?
High Oblique
Vertical
Low Oblique
Orthophoto maps have a scale of...
1:1 000
1: 100 000
1:10 000
1:1 000 000
What is an orthophoto map?
A realistic map taken from above
A photographic map
An accurate map of buildings, rivers and trees
An aerial photograph that includes map features
What type of aerial photo is this image?
High Oblique
Vertical
Low Oblique
Tick (/) 2 requirement of an aerial camera.
Must have very short cycle time
Lens must have high medium geometry
Enough roll film
Suitable storage for unused film only
There are 4 types of an aerial camera
TRUE
FALSE
"It has the ability to provide highest geometric picture quality" refers to .....
Strip Camera
Single Lens Frame
Multi Lenses Frame
Panoramic Camera
Which statement id TRUE?
Normal angle (up to 70°)
Wide angle (75° to 100°)
Super wide angle (greater than 90°)
"Has 2 or more lens and synchronized two or more photographs for an exposure" refer to .....
Single lens frame
Multi lenses frame
Strip camera
Panoramic camera
Panoramic camera is suitable for mapping purpose. TRUE or FALSE?
TRUE
FALSE
There are 3 component of aerial camera. TRUE or FALSE?
TRUE
FALSE
The function of camera magazine is to ......
Holds exposed and unexposed film
Pulled out without breaking the film
Able to set the film to be in the focus plane
Process the film quickly
The fixed relative positions in lens assembly and focal plane is so called elements of interior orientation.
It refer to ?
Inner cone
Diaphragm
Lens
Shutter
Scale can be expressed as ?
Unit equivalents
Ratios
Fraction
All above
If 1 cm on an aerial photograph represents 30000 cm on the ground, expressed it in FRACTION.
1cm = 3000cm
1:3000
1/3000
All above
A larger number in a scale expression denotes a larger scale.
TRUE
FALSE
1:2000 is larger than 1:6000
TRUE
FALSE
Scale = ab/AB = f/H . What is H?
focal length
height above sea level
flying height
Scale = ab/AB = f/H . What is f?
focal length
flying height
height above sea level
What is X
Positive print
Principle point
Image space
What is Y?
Optimus prime
Optic lens
Optical axis
------ is the taking of photographs of the ground from an elevated position.
Photography
Aerial photography
Satellite Image
Image
Which is following types of photograph are used in Aerial photogrammetry
Horizontal
Verical
Tilt
Oblique
Ideal photograph in aerial photogrammetry.
Vertical Photograph
Oblique Photograph
Aerial Photograph
The camera lens axis is truly vertical or perpendicular at the moment of exposure to the surface of the earth is called......
Vertical Photograph
Horizontal Photograph
Oblique photograph
Which photographs records only single band visible spectrum?
Colour
Panchromatic
Infrared
Which photographs are records by visible portion of spectrum?
Black and White
Colour
Panchromatic
Which photograph cover large area?
Vertical
Low Oblique
High Oblique
How close to your actual position can a GPS receiver measure?
Within 10.0 cm
Within 1.0 m
Within 10.0 m
Within 20.0 m
