@stefanv, see the example in scipy.ndimage.map_coordinates:
http://docs.scipy.org/doc/scipy/reference/generated/scipy.ndimage.interpolation.map_coordinates.html

More specifically, any array-like is valid, but the order of the dimensions of that array-like is dims-coords, rather than coords-dims. That is, in array notation, `start[i][j]` gives the coordinate in the ith dimension of the jth point. It's merely a transposition of what you would consider intuitive, not a big deal really. =)