Sich-2 satellite image georeferencing algorithm
We propose an algorithm for automatic image georeferencing for Ukrainian Sich-2 optical satellite. The idea of the algorithm is to perform automatic control points identification via area-based matching of satellite image with corresponding images from reference dataset. It is possible to identify large amount of control points under severe imaging conditions that enables using non-linear coordinate transformation models. We performed an accuracy assessment of our and existing algorithms on 73 Sich-2 images. The mean root mean squared error decreased in 42 times in comparison with error of georeferencing by orbital data only (from 590 m to 14 m) and decreased in 4 times in comparison with existing algorithms.