Display original and modified maps to determine necessary rotation
File name of the original map without anything drawn over
it (either a
File name of the modified version with drawings (either a
Rotation value to be applied, generally +/- 90
No return value. Function either modifies files on disk by rotating
images by the specified amount (if
apply_rotation = TRUE), or displays a
rotated version of
apply_rotation = FALSE).
If a call to ms_rectify_map detects potential image rotation,
that function will stop and suggest that rotation be applied using this
function in order to determine the required degree of image rotation. Values
rotation can be trialled in order to determine the correct value,
following which that value can be entered with
apply_rotation = TRUE in
order to actually apply that rotation to the modified image.
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