Judging your hand strength on different boards

[donkeykong2]

while this seems easy in nl holdem because of the limited amount of starting hands and calculations necessary, in omaha i think it is more difficult.
are there any easy ways or helps to determine the quality distribution of our opponents hand on the flop/turn/river?
what i am interested in is the ratio of hands that didnt hit at all, have bad straight draws, good straight draws, (top)two pair, sets, combo draws, one pair.... be able to merge the opponents preflop range with the board texture.