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  2. Tree height measurement - Wikipedia

    en.wikipedia.org/wiki/Tree_height_measurement

    American Forests, for example, uses a formula to calculate Big Tree Points as part of their Big Tree Program [3] that awards a tree 1 point for each foot of height, 1 point for each inch (2.54 cm) of girth, and ¼ point for each foot of crown spread. The tree whose point total is the highest for that species is crowned as the champion in their ...

  3. Ski geometry - Wikipedia

    en.wikipedia.org/wiki/Ski_geometry

    Ski geometry is the shape of the ski. Described in the direction of travel, the front of the ski, typically pointed or rounded, is the tip, the middle is the waist and the rear is the tail. Skis have four aspects that define their basic performance: length, width, sidecut and camber. Skis also differ in more minor ways to address certain niche ...

  4. Construction point - Wikipedia

    en.wikipedia.org/wiki/Construction_point

    Nearly all competitions in the FIS Ski Jumping World Cup use large hills with a construction point between 120 and 130. The largest is Mühlenkopfschanze in Germany.In addition, there is a bi-annual FIS Ski-Flying World Championship, which is held in one of the world's five ski flying hills: Vikersundbakken in Norway, Letalnica Bratov Gorišek in Slovenia, Čerťák in the Czech Republic ...

  5. Hill size - Wikipedia

    en.wikipedia.org/wiki/Hill_size

    Overview of a ski jumping hill Letalnica Bratov Gorišek in Planica, Slovenia. The construction point is marked with a horizontal line at the top of the red vertical line, while the line at the bottom is the hill size point. Hill size at 106 m. The hill size (HS) is the most important measurement for the size of a ski jumping hill.

  6. Ski pole - Wikipedia

    en.wikipedia.org/wiki/Ski_pole

    Wooden Cross Country ski poles, circa 1950. As of 2012, the earliest ski pole was found in Sweden and dates back to 3623 BC, while the earliest depiction of a man with a ski pole was found in Norway in the form of a cave painting, dated at 4000 BC. [4] [5] Early skiers would use this pole for the purposes of balancing, braking, and turning. [4]

  7. Ski jumping hill - Wikipedia

    en.wikipedia.org/wiki/Ski_jumping_hill

    The steepest point of the hill is the construction point, which is used to determine the score of a particular length. [clarification needed] The size of a hill is measured in the hill size. Hills with a hill size exceeding HS185 are designated ski flying hills; there are five such hills in the world.