First experience of 3D georeferencing accuracy assessment of SPOT 6 stereo panchromatic primary images by sensor-dependent orientation model

The panchromatic stereo images of SPOT 6 were assessed with respect to three-dimensional georeferencing accuracy using sensor-dependent orientation model for the first time. The panchromatic images were acquired in stereo mode with similar to 1.50 m ground sampling distance at nadir-view, covering Zonguldak (Turkiye) test site. The sensor-dependent orientation model developed for the Pleiades 1A & 1B and Gokturk 1 satellites were preferred since the imaging geometry of SPOT 6 is mostly identical with them. However, the quaternion estimation was modified in accordance with the SPOT 6's metadata. Two point sets, consisting of ground control points (GCPs) and independent check points (ICPs), were established by in-field GNSS survey, and adjusted georeferencing accuracy was estimated to be approximately +/- 1 cm and +/- 1.50 m (+/- 1 GSD) at GCPs and ICPs, respectively. All process was carried out by Geo3o1 tool of GeoEtrim derived in MATLAB environment.

Automated summary

The panchromatic stereo images of SPOT 6 were evaluated for their three-dimensional georeferencing accuracy using a sensor-dependent orientation model. Ground control points and independent check points were used to establish two point sets, and the accuracy was estimated to be around +/- 1 cm and +/- 1.50 m at the respective points.