Section 2.3 Flashcards Preview

Geography 228 > Section 2.3 > Flashcards

Flashcards in Section 2.3 Deck (14):
1

What is associated with business issues? (4)

Cost of survey
Scheduled period of inspection
Criteria for reflight
Schedules for delivery and payment

2

What is associated with study area? (2)

Delineation of the area to be photographed
Future flight plan map

3

What is associated with timing and cloud cover? (3)

Season
Time of day
Cloud cover

4

What is associated with film-filter combination

Colour photo, black and white.

5

What is associated with mapping camera? (2)

Focal length
Resolving power of the lense

6

What is associated with flight lines? (2)

Parallel along axis of study area
North-South , East-West?

7

What is associated with flight plan map? (7)

Flight altitude above terrain
Flight altitude above sea level
Lateral ground distance per photo
Alignment of flight lines
Number of photos per flight line
Total number of photos

8

What is the percentage of overlap and side lap?

Forward overlap = 60%
Side overlap = 20-30%

9

What is associated with photo alignment?

Drift should not effect more than 10% of the print width

10

What is associated with tilt?

It should not exceed 2-3 degrees
Average

11

What is associated with film and print products?

Type
Scale

12

Identify the variables:

NL = (W/(D x Sg))+ 2

NL = number of flight lines
W = width of study area
D = lateral ground distance of single photo
Sg = sidelap gained by each successive flight line
2 = number of extra photos added to ensure coverage

13

Identify the variables:

NP = (L/(D x Og)) +4

NP = number of photos per flight line
L = length of flight line
D = lateral ground distance
Og = overlap
4 = number of photos added to assure coverage

14

What ten things need to be considered when looking at aerial photography missions?

Business issues
Study area
Required timing, cloud cover
Film-filter combination
Mapping cameras
Flight lines
Overlap and side lap
Photo alignment
Tilt
Film and print products