LiDAR - US State High Points
Posted: Mon Jun 13, 2022 2:15 pm
Summary:
I've found class 2 (ground) points a foot higher than Pennsylvania's traditionally accepted high point, the top of a ~5' boulder. Since these are class 2 only, it's likely that there are boulders in these areas that are a few, if not several feet higher than the traditional high point. See links below:
New PA high point (highest class 2 returns): https://listsofjohn.com/peak/218278
Old PA high point (class 1 return on traditionally accepted boulder): https://listsofjohn.com/peak/17861
Notes: https://listsofjohn.com/lidarnotes?id=17861
Background:
I've been taking a look at some state high points recently, especially ones with lidar coverage and that have competing contours. No surprises until I came to the Pennsylvania high point, Mt. Davis. John Kirk, Andy Hatzos (Andy Martin's friend), and I agree that the traditional high point is on top of a boulder ~5' above the ground, with a class 1 lidar return reading at 3212.73 feet. Looking elsewhere though, I came across class 2 returns (ground only - not including boulders, trees, etc) that were above 3213 feet, some even almost 3214 feet.
Areas with class 2 returns over 3213':
39.783126,-79.178375,3213.45 (four returns, highest shown)
39.783179,-79.17820,3213.19 (four returns, highest shown)
39.783520,-79.177894,3213.55 (six returns, highest shown)
39.783648,-79.177709,3213.71 (seven returns, highest shown) (~900 ft from old HP)
39.783773,-79.177766,3213.25 (two returns, highest shown)
39.798385,-79.171250,3213.81 (11 returns in 3 clusters, highest shown -- 2 returns tie for highest) (0.9 mi from old HP)
John and I agreed on the traditional high point location and elevation, and he also agreed with the other findings. John notified Any Martin, who notified several others - one of whom (Andy Hatzos) responded with the email below:
I've found class 2 (ground) points a foot higher than Pennsylvania's traditionally accepted high point, the top of a ~5' boulder. Since these are class 2 only, it's likely that there are boulders in these areas that are a few, if not several feet higher than the traditional high point. See links below:
New PA high point (highest class 2 returns): https://listsofjohn.com/peak/218278
Old PA high point (class 1 return on traditionally accepted boulder): https://listsofjohn.com/peak/17861
Notes: https://listsofjohn.com/lidarnotes?id=17861
Background:
I've been taking a look at some state high points recently, especially ones with lidar coverage and that have competing contours. No surprises until I came to the Pennsylvania high point, Mt. Davis. John Kirk, Andy Hatzos (Andy Martin's friend), and I agree that the traditional high point is on top of a boulder ~5' above the ground, with a class 1 lidar return reading at 3212.73 feet. Looking elsewhere though, I came across class 2 returns (ground only - not including boulders, trees, etc) that were above 3213 feet, some even almost 3214 feet.
Areas with class 2 returns over 3213':
39.783126,-79.178375,3213.45 (four returns, highest shown)
39.783179,-79.17820,3213.19 (four returns, highest shown)
39.783520,-79.177894,3213.55 (six returns, highest shown)
39.783648,-79.177709,3213.71 (seven returns, highest shown) (~900 ft from old HP)
39.783773,-79.177766,3213.25 (two returns, highest shown)
39.798385,-79.171250,3213.81 (11 returns in 3 clusters, highest shown -- 2 returns tie for highest) (0.9 mi from old HP)
John and I agreed on the traditional high point location and elevation, and he also agreed with the other findings. John notified Any Martin, who notified several others - one of whom (Andy Hatzos) responded with the email below: