| AIRBORNE GPS
Aero-Metric is an industry leader in the application of precision GPS positioning and attitude determination of airborne platforms. We use the latest in GPS and Inertial Measurement instruments and software, adapting breaking technologies into production systems tailored to photogrammetric applications.
Capabilities include:
• Project control network design and datum resolution
• Accurate geodetic ground control surveys
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Precise GPS positioning of aircraft and mapping sensors
• Attitude determination of aerial mapping cameras and other airborne sensors
Inertial Measuring Unit (IMU)
The IMU is an instrument that combines three accelerometers and three gyroscopes. These two types of sensors are combined to measure two distinctly different but equally important parameters. Starting at a known position provided by GPS and tracking over time the changes in acceleration of the instrument, the IMU improves the accuracy of the dimensional coordinates (latitude, longitude and height). The three gyroscopes sense rotational acceleration and provide the orientation of the body in three dimensions (roll, pitch and yaw).
These advanced positioning systems greatly reduce, or sometimes eliminate, the need for ground survey control for mapping operations. In some cases the need for the aerotriangulation step in map production can be eliminated. Both of these attributes bring great cost savings and accelerated schedules to projects.
Our present technology allows us to position airborne mapping sensors to accuracies up to 5 centimeters, and to determine orientation angles to accuracies of 20 arc seconds. These stated accuracies are in reference to the map product ground coordinate system and allow us to produce both high accuracy and cost efficient mapping.
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