Peak lists are changing!

Discuss geopolitical area highpoints, prominence, and similar lists.

Re: Peak lists are changing!

Postby mikeofferman » Tue Dec 21, 2021 7:38 pm

I think that the saddle for Yale is off by 1k


# Name Map Elevation Map Saddle Map Prominence LiDAR Elevation LiDAR Saddle LiDAR Prominence
40 Yale, Mount 14,196' 12,300' 1,896' 14,200' 13,326' 874'
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Re: Peak lists are changing!

Postby bdloftin » Tue Feb 01, 2022 5:11 pm

jmbrooks,

Here's a useful link with all the info you wanted (or didn't want) to know about the USGS 3DEP lidar base specifications.
https://www.usgs.gov/ngp-standards-and- ... e-contents

Regarding nominal pulse spacing and vertical accuracy, see this link: https://www.usgs.gov/ngp-standards-and- ... ion-tables
The USGS is wanting to fill the CONUS and Hawaii with Quality Level 2 lidar data (Alaska will be covered by interferometric synthetic-aperture radar).

Regarding coordinate systems/datums, see here: https://www.usgs.gov/ngp-standards-and- ... nts#datums
For the vertical datum, they were first required to use GEOID12 iterations, but are now going with GEOID18 which differs from the former by less than a couple centimeters.
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Re: Peak lists are changing!

Postby jmbrooks8 » Sun May 22, 2022 4:43 pm

I just noticed you are updating the coordinates of LiDAR based peak data with 5 digits. I think that is fantastic. I believe in CO that is ~ +/- 2 ft.
Sure appreciate the extra accuracy & precision.

I've checked some of my old summit gps pts and the new data definitely aligns better.
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