code: def point_window_unitxy(x, y, affine):
      
      fcol, frow = ~affine * (x, y)
      r, c = int(round(frow)), int(round(fcol))
  
      # The new source window for our 2x2 array
      new_win = ((r - 1, r + 1), (c - 1, c + 1))
  
      # the new x, y coords on the unit square
      unitxy = (0.5 - (c - fcol),
                0.5 + (r - frow))
  
      return new_win, unitxy
docs: Given an x, y and a geotransform
      Returns
          - rasterio window representing 2x2 window whose center points encompass point
          - the cartesian x, y coordinates of the point on the unit square
            defined by the array center points.
  
      ((row1, row2), (col1, col2)), (unitx, unity)