That's my approach to it:
Wind:
From 1-10 MPH
Headwind: + MPH in Yards (Wind 5 MPH = + 5 Yards)
Tailwind: - MPH in Yards (Wind 5 MPH = - 5 Yards)
From 11+ MPH I calculate times 1.5
Headwind: + MPH in Yards (Wind 12 MPH = + 18 Yards or more because of Backspin)
Tailwind: - MPH in Yards (Wind 15 MPH = - 18 Yards)
Elevation:
3 Ft = 1 Yard
Up 9 Ft = + 3 Yards
Down 9 Ft = - 3Yards
Up to AI strength (difficulty) 90 I managed very good approach shots with it in career mode. I'm currently playing on difficulty 95 and need to fine-tune it a bit.
For Siedwind i also count the aquares like @theycagednon did.
Another tip:
- Go into the challenges and do the approach challenges or single player with mulligan function.
- Hit every shot with every club to maximum length.
- Make a note of how far the ball flies and make a note of about 5 shots.
Then you know approximately how much your shot deviates from the distance specification and you can also add these yards if you want to hit a certain point.
Of course, you then also have to consider whether the ball will roll or backsppin. You can also make a note of this when doing your test swings.
This should give you a list of the distances and characteristics of your clubs and shots.