I am trying to use ndimage's uniform_filter (for a simple local mean filtering) on a map-projected image that has NAN's at the border (basically the corners where the rotated map projected image does not fit into the rectangular grid).

Is there a way, maybe in skimage, to use a uniform_filter on an array that contains NANs? ndimage' version does not cope with it correctly:

array([ nan,   1.,   2.,   3.,   4.,   5.,  nan])

> nd.filters.uniform_filter(arr, 3)

array([ nan,  nan,  nan,  nan,  nan,  nan,  nan])

Cheers,

Michael