The rise of the ramp is the vertical dimension and the horizontal projection or run of the ramp is the horizontal dimension. If the slope of a ramp is between 1:12 and 1:16, the maximum rise shall be 30 inches (760 mm) and the maximum horizontal run shall be 30 feet (9 m).
GoPro, Inc. (formerly Woodman Labs, Inc), is an American manufacturer of action cameras, often used in extreme-action videography.
It actually forces the limits of the GoPro Hero 4 Black Edition with 4K@30 fps. You can see the differences of GoPro Hero 4 Silver Edition and the other GoPro editions in the chart below this review. 4K means extra extra video quality, near cinema quality.