Incorporation of relief in polynomial-based geometric corrections

This study focuses on the geometrical deformations introduced by relief in images captured by the TM sensor of Landsat satellites and by the HRV sensor of SPOT satellites. Different correction alternatives are presented in order to incorporate altitude data into correction procedures based on first-degree polynomial models. Column and row determinations from the corresponding map coordinates are carried out independently. Three different models for columns and two for rows are proposed. The results have been contrasted with those obtained using classic first- and second-degree polynomial calculations, and with those obtained using an orbital model (for SPOT images). The models presented are easy to implement and provide a level of precision similar to that of the orbital model used, while they are much more efficient in calculation time. In view of the results, the model which integrates altimetric data into a single first-degree polynomial seems of particular interest. -Authors