Footprint Removal with Co-ordinate Rotation

Summary Some of the effective footprint removal filtering techniques assume that the footprint orientations are parallel to the co-ordinate axes of the filter; but when they are not, those techniques may fail. A direct rotation of the data volume in order to line up the footprint orientation with the co-ordinate axes for filter operation, and rotating it back to the original orientation will involve two re-binning processes. Data rotation introduces errors due to imperfect interpolation methods in practice. Given this fact, in this paper, we will try to minimize those errors by only estimating the footprint in the rotated co-ordinates, and rotating it back to be removed from the original unrotated input data.