local_partial_pixel_derivatives

astropy.wcs.utils.local_partial_pixel_derivatives(wcs, *pixel, normalize_by_world=False)

Return a matrix of shape (world_n_dim, pixel_n_dim) where each entry [i, j] is the partial derivative d(world_i)/d(pixel_j) at the requested pixel position.

Parameters:

wcsWCS

The WCS transformation to evaluate the derivatives for.

*pixelpython:float

The scalar pixel coordinates at which to evaluate the derivatives.

normalize_by_worldbool

If True, the matrix is normalized so that for each world entry the derivatives add up to 1.