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Provide a general description of the issue or problem.
I am trying to use calculate_solar_rotate_shift and mapsequence_coalign_by_rotation to remove solar rotation in the Solar Orbiter EUI/HRI data. However, I found these functions are not designed to derotate the images except for SDO cutout data.
For example, in mapsequence_coalign_by_rotation, the xshift and yshift in arcsecs are converted to pixels by
which assumes a diagonal rotation matrix PC_ij. There are similar treatments in calculate_match_template_shift and mapsequence_coalign_by_match_template but they cancel each other.
In addition, the rotation shift in arcseconds is calculated by the difference between the coordinates of the reference layer center and the derotated map center,
and this only works when all maps in the sequence have the same center Tx and Ty. Considering the worst scenario that the center coordinates vary significantly along the latitudinal direction, then the routine will shift the image to compensate the solar rotation and the difference in Ty.
The text was updated successfully, but these errors were encountered:
In addition, the rotation shift in arcseconds is calculated by the difference between the coordinates of the reference layer center and the derotated map center,
Provide a general description of the issue or problem.
I am trying to use
calculate_solar_rotate_shift
andmapsequence_coalign_by_rotation
to remove solar rotation in the Solar Orbiter EUI/HRI data. However, I found these functions are not designed to derotate the images except for SDO cutout data.For example, in
mapsequence_coalign_by_rotation
, the xshift and yshift in arcsecs are converted to pixels bywhich assumes a diagonal rotation matrix PC_ij. There are similar treatments in
calculate_match_template_shift
andmapsequence_coalign_by_match_template
but they cancel each other.In addition, the rotation shift in arcseconds is calculated by the difference between the coordinates of the reference layer center and the derotated map center,
and this only works when all maps in the sequence have the same center Tx and Ty. Considering the worst scenario that the center coordinates vary significantly along the latitudinal direction, then the routine will shift the image to compensate the solar rotation and the difference in Ty.
The text was updated successfully, but these errors were encountered: