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I build 3d models using Agisoft and need to record the position of the Ground Control Points as accurately as possible, latitude , longitude and altitude. What is the best way of doing this?

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The most accurate position is probably calculated by using a sensor-fusion algorithm.

As sensors you can use:

  • GPS for absolute (but relatively inprecise position)
  • Distance sensors (either via triangulation with multiple ground stations or via a SLAM algorithm)
  • Odometric data from your quadrocopter (motor power)
  • Acceleration (lot's of drift over time but precise for a short time)

This sensor data can be fused used something like a Kalman-Filter.

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