Airborne GPS (ABGPS) collects photo center coordinates; these coordinates are triangulated and used to control the photography. During the flight mission GPS receivers are simultaneously collecting data at 1-second intervals.
A Positional Dilution of Precision (PDOP) report that includes charts and plots for the available satellites will also be supplied to our clients. ABGPS data will only be collected when the number of satellites and their geometry can support a PDOP of 3 or less.

Light Detection And Ranging (Lidar) can also be collected during the same mission. Lidar is similar to Sonar or Radar except it uses laser light pulses instead of sound or radio waves, combined with ABGPS and IMU, it produces a dense point cloud.

Benefits of Lidar:

• Penetrates through dense vegetation for better accuracy.
• Able to fly day or night.
• Large areas of land can be covered relatively quickly.
• Post processing is quicker than traditional photogrammetry.
• Digital orthos can be produced right away.

Inertial Measurements Units (IMU) provides rotation angles which enables us to set up 3D stereo models for immediate quality control and collection.