VisionMap A3 Digital Mapping System
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| Overview | |
|---|---|
| Type | Airborne Digital Camera and Ground Processing System |
| Sensor/medium | |
| Sensor type | Dual CCD |
| Recording medium | Flash Drive 1TB |
A3 Digital Mapping System is comprised of a digital airborn camera and an automatic ground processing system[1] produced by VisionMap. The A3 camera consists of a dual CCD camera, a Jpeg2000 compression and storage unit and a GPS unit. A3 captures imagery using a sweep mechanism, which collects vertical and oblique imagery simultaneously. The captured data is post-processed in the A3 LightSpeed ground processing system in order to create the final products.
The A3 System is used by numerous national and regional mapping agencies, as well as commercial mapping firms.
Camera Operation
The typical workflow consists of flight line planning, aerial survey and a data post-processing, which includes multiple geometric transformations in order to produce the resulting orthophoto and other types of output.
The camera consists of a frame, two lenses mounted on a special motor controlled axis that is attached to the frame. This construction allows the camera to operate in a sweeping mode in the cross-track direction. This provides a wide 104 degrees FOV.
The captured frames are compressed using hardware Jpeg2000 lossless compression unit allowing high data throughput. These frames along with the metadata recorded during the flight are processed on the ground.
The processing includes various photogrammetric techniques like aerial triangulation and image registration. The process can optionally produce the digital terrain model along with the final large image.
Major features
- Fully automatic processing with no ground control points needed.
- digital terrain and surface models generation
- Large 104 Degrees field of view and 62,000 pixel-wide footprint
- 300mm focal length allowing operation at high altitudes