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REVIEWWWW > semiPhoto > Flashcards

semiPhoto Flashcards

1
Q

A spatial view can be obtained with naked eyes for a distance up to

A

640m

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2
Q

which of the following is an appropriate scale of an air photograph

A

1cm = 100m

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3
Q

The focal length of an aerial camera is 12.5cm and the exposure station was 2500m above datum. The scale of the photograph is

A

1cm=200m

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4
Q

An aircraft Flying at a ground speed of 180km/h. The focal length of the canera is 159mm. The longutudinal coverage of the ground is 900m. Ehixh one is the exposure interval.

A

18s

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5
Q

if the distance of the image of a point A from the isocentre, on a tilted photograph is 15.6mm and the same distance is equal to 14.9mm on a vertical photograph, tilt distortion is

A

0.7mm

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6
Q

A vertical photograph was taken at a altitude of 1500 MSL if the focal length of the camera is 20m, the scale of photograph for a terrain lying at sn elevation of 500m is

A

1:50

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7
Q

Twi consecutive photographs were taken with an overlap of 55% and the print size was 22.5cm X 22.5cm for both the photographs. All the conditions were same and the scale of the photograph was 1cm=200m. The lenght of air base is

A

2.025km

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8
Q

A vertical photograph of a chimney was taken from an elevation of 500m above MSL. The elevation of the base of chimney was 250m. If the relief displacement of the top of chimney was 51.4mm and the radial distance of the image of the top of the chimney was 110mm, the height of the chimney is

A

116.82

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9
Q

In an aerial photogrammetric survey, if the exposure interval is 20 seconds to cover a ground distance of 100m between exposure, what would be the ground speed of the aircraft?

A

180km/hr

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10
Q

What is the actual ground area covered by a 20cm X 20cm size vertical aerial photograph, at an average scale of 1cm = 200m having 60% forward overlap 0% side overlap?

A

4.48 km2

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11
Q

A tower appears in two successive photographs taken at an altitude of 4000m above datum. The focal length of the camera is 160mm, the length of the air base is 300m. The parallax for the top and bottom of the tower are 72mm and 63 mm respectively. The height of the top of the tower above its bottom is nearly

A

95m

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12
Q

A road section of length 1 km scales 8cm on a vertical photograph. The focal length of the camera is 160mm. If the terrain is fairly level, then the flying height will be

A

2000m

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13
Q

The distance of images of the top and bottom of a tower, in a print taken from H above ground, are D and d from principal point, respectively. The height is then

A

H(D-d)/D

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14
Q

If f is the focal length of camera and t is the tilt angle, distance of the photo nadir from the principal point will be

A

t tan (theta)

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15
Q

If the net length covered by each photograph is 1.2km and the length of strip os 20km, the number of air photographs required are

A

18

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16
Q

aerial photographs are

A

perspective projections

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17
Q

The perspective and orthographic projections produce similar images on a

A

vertical photograph

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18
Q

The vertical axis of a camera is inclined by 1degrees to the vertical to cover large number of details while photographing from air. The resulting photograph will be a

A

oblique photograph

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19
Q

Vertical photographs do not replresent the true plan of the ground because of

A

ground relief

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20
Q

Which of the following coincides with the point of intersection of x and y axes of an aerial photograph?

A

Principal point

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21
Q

The scale if vertical photographs of a flat terrain, with a variation in the flying altitude, will be

A

non-uniform

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22
Q

On a vertical photograph the relief displacement is always radial from

A

principal point

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23
Q

Ground control points are established in aerial photogrammetry to control

A

scale

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24
Q

When the effect of wind is not considered during flight planning, the result is a

A

drift

25
Q

When the aerial camera cannot be kept square with the direction of flight, the result is a

A

crab

26
Q

The spatial view of a photographed terrain canbe has through

A

stereoscope

27
Q

The elevation of the objects on air photographs can be measure because of the

A

stereoscopic fusion

28
Q

In aerial photogrammetry, map details are plotted by

A

All of the above

29
Q

slotted template method of map plotting in aerial survey is

A

mechanical method

30
Q

Rectification pf aerial photographs is required for

A

Both a and b

31
Q

In air photogrammetry the desired overlap is obtained by

A

intervalometer

32
Q

For reconnaissance of preliminary location of highways, the aerial photographs used should preferably be

A

oblique

33
Q

Aerial photograph in which the horizon is included is known as

A

tilted

34
Q

Tilt displacements are radial about

A

isocentre

35
Q

In a tilted photograph, the relief displacement is radial from the

A

nadir point

36
Q

Parallax bar is used to measure

A

parallax difference

37
Q

An example of air-photo interpretation key is

A

elimination key

38
Q

Observation of two photographs simultaneously is called

A

stereoscopy

39
Q

The relief displacement on an air photograph decreases with the

A

both B and C

40
Q

Pick out the correct statement for relief displacement in aerial photographs

A

It is positive and radially for points above datum

41
Q

Overlap in arrial photograph is necessary

A

for all the above

42
Q

The object of photo-interpretation is

A

all of the above

43
Q

photo- interpratation depends upon

A

All of the above

44
Q

Pick out the correct statement for picture control points in aerial photographs

A

these do not have corresponding ground control points

45
Q

Pick out the incorrect statement regarding mosaics in aerial photogrammetry

A

uncontrolled mosaics are obtained by rectified air photographs

46
Q

an aerial photographs is taken at a flying height of H1 metre above the datum. The focal length of the camera was f cm and the average scale was 1cm=H2 metre such that H2>H1. This implies that

A

the photograph terrain lies at an elevation (H2-H1) below the datum

47
Q

(i) The horizon point of an aerial photograph ABCD lies on the photo itself.
(ii) The photograph ABCD is a high oblique photograph
State whether

A

(ii) follows from (i)

48
Q

in a tilted photograph

A

the downward half has larger scale

49
Q

(i) In aerial photograph the principal and nadir points councide,
(ii) The isocentre also cooncide with the other two points
Conclusion: It is a truly vertical photograph
State whether

A

the conclusion can be deduced only if both (i) and (ii) are given

50
Q

An observer views two points A and B such that the angle of parallax of B is greater than that of A. Therefore,

A

object B is nearer the observer

51
Q

The difference of parallax for a given difference in elevation is independent of

A

All of the above

52
Q

Which of the following is true for a tilted photograph?

A

The scale is uniform for all the points on a line perpendicular to the principal line

53
Q

Which of the following is true

A

Both a and b

54
Q

Homologous points are

A

corresponding points on the ground and the photograph

55
Q

Setting off the ‘proper principal distance’ in the projectirs of projection stereoplotters is a procedure for which one of the following

A

evaluating the digital terrain model

56
Q

The basic requiremnts of an aerial camera is

A

All of the above

57
Q

(i) Every point on an aerial photograph is displaced from its true orthographic position
(ii) amAerial photographs show perspective view
State whether

A

both (ii) and (ii) are true and (i) follows from (ii)

58
Q

Pick out the correct statement

A

both (i) and (ii) are true

59
Q

Pick out the correct statement for aerial photogrammetry

A

both (i) and (ii) are correct

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