Drop pod deviation above terrain
Drop pods scatter 2D6 inches.  If the scatter does not take the model fully over a piece of impassible terrain, it stops at the edge of the impassible terrain.  If the model can be physically placed on the other side of the terrain moving no further than the rolled distance-even if that would put it off the edge of the playing area-it must then be placed on the other side of the terrain. 

Sames goes for enemy units encountered by a drop pod scatter roll.