Upgrade to Pro — share decks privately, control downloads, hide ads and more …

Green Speed is More Than a Number

C62291821dac0dd5b7ef3b72a30cd137?s=47 Micah Woods
January 22, 2018

Green Speed is More Than a Number

I've collected data on green speed and on dispersion of golf balls as they roll across a putting green. The analyses I've made of these data are not so much about the exact measurements, or the average of the measurements, but more about the variation in the measurements. That is, what is normal variation if I measure green speed at location X on green 1 and then move to location Y on green 1. Is the speed identical? What if it varies by 7 inches, is that normal, or is that unusual? What is the normal variation in green speed from all 19 or 20 greens at an 18 hole facility? What is abnormal variation? And what is normal dispersion of ball roll across a green? What is abnormal dispersion?

C62291821dac0dd5b7ef3b72a30cd137?s=128

Micah Woods

January 22, 2018
Tweet

Transcript

  1. Green Speed is More Than a Number Micah Woods 22

    January 2018 Chief Scientist Asian Turfgrass Center www.asianturfgrass.com
  2. creeping bentgrass, Japan

  3. Today’s topics 1. Green speed described, compared to what we

    actually report
  4. Today’s topics 1. Green speed described, compared to what we

    actually report 2. Measurements I’ve made of green speed
  5. Today’s topics 1. Green speed described, compared to what we

    actually report 2. Measurements I’ve made of green speed 3. Measurements under tournament conditions
  6. Today’s topics 1. Green speed described, compared to what we

    actually report 2. Measurements I’ve made of green speed 3. Measurements under tournament conditions 4. Measurements of ball dispersion
  7. Today’s topics 1. Green speed described, compared to what we

    actually report 2. Measurements I’ve made of green speed 3. Measurements under tournament conditions 4. Measurements of ball dispersion 5. Case study: 2016 Ryder Cup at Hazeltine
  8. Green speed described, compared to what we actually report

  9. None
  10. First sentence: “One of the most significant aspects of a

    golf course is the uniformity of its putting greens.”
  11. Second sentence: “Variations in speed, whether from one green to

    the next or on different parts of the same green, can do more to negate a player’s skill than can ragged fairways or unkempt bunkers.”
  12. None
  13. None
  14. None
  15. None
  16. None
  17. None
  18. Measurements I’ve made of green speed

  19. creeping bentgrass, Japan

  20. None
  21. Novotek bermudagrass, Thailand

  22. None
  23. None
  24. Variation between greens

  25. korai, Japan

  26. None
  27. None
  28. What does a standard deviation of 0.3 feet look like?

  29. None
  30. Measurements under tournament conditions

  31. Keya GC, Fukuoka, Japan, greenkeeper Andrew McDaniel, on Twitter as

    @drumcturf
  32. Keya GC, Fukuoka, Japan

  33. Keya GC, Fukuoka, Japan

  34. None
  35. None
  36. None
  37. None
  38. None
  39. None
  40. Measurements of ball dispersion

  41. korai, Thailand, project of Dr. Eric Reasor, on Twitter as

    @TurfBlade
  42. korai, Thailand

  43. bermudagrass, Thailand

  44. bermudagrass, Thailand

  45. None
  46. None
  47. None
  48. None
  49. None
  50. Case study: 2016 Ryder Cup at Hazeltine

  51. Hazeltine National GC, superintendent Chris Tritabaugh, on Twitter as @ct_turf

  52. creeping bentgrass, Minnesota

  53. creeping bentgrass, Minnesota

  54. None
  55. None
  56. None
  57. None
  58. For more, please see www.asianturfgrass.com or @asianturfgrass on Twitter.