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Dave Pelz[1] stated “My research shows that while tougher greens (meaning faster and more severely sloped) affect all players, multi-level greens are especially troublesome. Whether they’re putting or chipping, few golfers know how to negotiate well-defined uphill and downhill slopes.” His solution is to putt to a “virtual hole” which is further away from actual hole on uphill putts, and closer than the actual hole on down-hill putts. This difference is calculated from the estimated elevation change (inches), by multiplying it by 10 to obtain the change. “So if the tier is two- to three-inches different, your ‘target’ is two feet from the real hole.”
Picture 6 of reading green photos represents a golfer making a green reading of the ball-hole slope on the low side about midway between the ball-hole distance. He’s in a squatting position while holding the club with the top edge of the shaft in line with the ball-hole line.
An analysis was made of the fractional change in the virtual hole distance (delta factor) as a function the green slope. It was concluded that the delta factor for a medium speed green is 15% per unit slope. For example, for a 3% slope, the delta factor would be 45%. For example, a 10 ft. putt, the virtual hole is about 15 ft. or 5 ft. from the ball depending on whether it’s an up-hill or down-hill putt.
Reading green photos:
http://www.facebook.com/album.php?ai...8&l=31622d981b
[1] Dave Pelz, Tiers of Relief, Sports Illustrated, Feb. 2001
Picture 6 of reading green photos represents a golfer making a green reading of the ball-hole slope on the low side about midway between the ball-hole distance. He’s in a squatting position while holding the club with the top edge of the shaft in line with the ball-hole line.
An analysis was made of the fractional change in the virtual hole distance (delta factor) as a function the green slope. It was concluded that the delta factor for a medium speed green is 15% per unit slope. For example, for a 3% slope, the delta factor would be 45%. For example, a 10 ft. putt, the virtual hole is about 15 ft. or 5 ft. from the ball depending on whether it’s an up-hill or down-hill putt.
http://www.facebook.com/album.php?ai...8&l=31622d981b
[1] Dave Pelz, Tiers of Relief, Sports Illustrated, Feb. 2001