Section 2.3 Flashcards
What is associated with business issues? (4)
Cost of survey
Scheduled period of inspection
Criteria for reflight
Schedules for delivery and payment
What is associated with study area? (2)
Delineation of the area to be photographed
Future flight plan map
What is associated with timing and cloud cover? (3)
Season
Time of day
Cloud cover
What is associated with film-filter combination
Colour photo, black and white.
What is associated with mapping camera? (2)
Focal length
Resolving power of the lense
What is associated with flight lines? (2)
Parallel along axis of study area
North-South , East-West?
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
What is the percentage of overlap and side lap?
Forward overlap = 60%
Side overlap = 20-30%
What is associated with photo alignment?
Drift should not effect more than 10% of the print width
What is associated with tilt?
It should not exceed 2-3 degrees
Average
What is associated with film and print products?
Type
Scale
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
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
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
