sip_rot90¶

grizli.utils.sip_rot90(input, rot, reverse=False, verbose=False, compare=False)[source]¶

Rotate a SIP WCS by increments of 90 degrees using direct transformations between x / y coordinates

Parameters

inputHeader or WCS: Header or WCS
rotint: Number of times to rotate the WCS 90 degrees clockwise, analogous to numpy.rot90
reversebool, optional: If input is a header and includes a keyword ROT90, then undo the rotation and remove the keyword from the output header
verbosebool, optional: If True, print the root-mean-square difference between the original and rotated coordinates
comparebool, optional: If True, plot the difference between the original and rotated coordinates as a function of x and y

Returns

headerHeader: Rotated WCS header
wcsWCS: Rotated WCS
descstr: Description of the transform associated with rot, e.g, x=nx-x, y=ny-y for rot=±2.