| Digital
Camera
The cameras we utilize for digital photos is the Imacon Ixpress
132C with a Rodenstock
Apo-Sironar Digital HR lens. Each camera has a 22 mega pixel sensor,
37mm x 49mm (4080 x 5440 pixels) with a 60mm lens. More
equipment info.
Single
Camera Configuration
The camera is
positioned vertically where the width of the ground coverage (5440
pixels) is determined by flying height. The length will be shorter
(4080 pixels) therefore requiring more exposures per flight line.
Bicamera
Configuration
Two cameras are
arranged so that one looks off to the left while the other looks
to the right. Both cameras are exposed at the same time so that
the right and left images overlap slightly directly under the aircraft.
The bicamera configuration allows for approximately twice the width
of ground coverage compared to the single camera vertical configuration
requiring fewer flight lines and therefore reducing cost and time.
Schematic
Diagram
Digital
versus Analog
| Imacon
Ixpress 132C
with 60mm lens |
Wild
RC 30
with 153mm (6”) or 303mm (12”) lens |
- Raw
images are processed as 8 or 16 bit TIFF’s and shipped
on CD's, DVD's, or removable hard drives
- Each
camera is capable of storing up to 850 images
- Ranges
from 10cm to 100cm GSD
- Perspective
centre recovery and FMC is currently unavailable but we
are looking into integrating GPS and IMU for this purpose
- Allows
for acquisition of digital stereo imagery without the added
cost of scanning. Currently researching orthophoto production
processes for the digital images
- Imagery
can be acquired in less then favourable lighting conditions
thereby increasing the number of flying hours
- Rapid
response time from acquisition to final product delivery
|
- Black
and white or colour negative film requires processing
- Approximately
580 images on a 500ft roll of black and white film and 460
images on a 400ft roll of colour film
- Ranges
from 1:2,000 – 1:44,000 Scale
- Capable
of GPS for perspective centre recovery as well as forward
motion compensation (FMC)
- Allows
for acquisition of stereo imagery, photogrametric mapping
and digital orthophoto production with scanned imagery
- Imagery
should be taken between 35 and 53 degrees of sun angle for
black and white film and between 38 and 53 degrees for colour
film. This limits the number of flying hours depending on
the time of year
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