Photogrammetry is based on the intersection of two or more light rays which are used to define a point in object space.

Correct reconstruction of camera geometry and lens distortion parameters is necessary for good results.

Camera resolution is also important – a higher resolution will provide increased precision. For example, using a 12 Mp camera from a flying height of 300 m will give a ground resolution of better than 6 cm (note this is not the same as accuracy, which is project dependent).

• GPS ground control points to improve accuracies and apply absolute coordinates
• Correct reconstruction of camera geometry and lens distortion parameters
• GPS data collected 5/second along with UTC time, lat/long, elevation, roll, pitch and yaw, bearing, flight line, etc
• Centimeter precisions
• Best in the industry resolution of 5cm