Investigation of the effects of different GPS solutions and different base distances to the orientation accuracy in kinematic GPS supported aerial triangulation

In this research, A block of photos with 43 cm ground sampling distance covering a 1/100.000 scale topographic map area have been taken by a large format digital aerial camera (i.e. Vexcel UltraCam X). Approximate orientation parameters have been defined by GPS/IMU system placed in the plane. Four Ground Control Points (GCP) have been marked on the corners of the rectangular block and made GPS observations. 20 Independent Check Points (ICP) have been collected over the block in order to test the accuracy of the triangulation. CORS Points with different number, distribution and distance have been used to process the GPS/IMU data collected during flight. Besides these points Precision Point Positioning (PPP) data available in the internet have been used process the GPS/IMU data. It is seen that distances of CORS Points until 150 km in processing GPS/IMU data for approximate orientation of aerial photos are in acceptable tolerances in 1/25.000 scale topographic map production accuracies. Also, using PPP in processing GPS/IMU data is acceptable in the production of 1/25.000 scale topographic maps.