Colorado LiDAR Findings

[RyanSchilling]

I take your meaning now, thank you!

I meant from meters to feet, apologies. In las2las there’s an option to convert to survey feet (as well as meters and feet) in the Target Projection menu on the right. For consistency you could use this option, though it shouldn’t make too much of a difference for vertical measurements (<0.03 ft).

Sounds like you have a GUI for LasTools? Is this in ArcGIS? I'm using command lines for las2las

[bdloftin77]

I take your meaning now, thank you!

I meant from meters to feet, apologies. In las2las there’s an option to convert to survey feet (as well as meters and feet) in the Target Projection menu on the right. For consistency you could use this option, though it shouldn’t make too much of a difference for vertical measurements (<0.03 ft).

Sounds like you have a GUI for LasTools? Is this in ArcGIS? I'm using command lines for las2las

Yeah, there's a GUI for las2las which is nice. Here's where I got las2las from: I downloaded lastools from rapidlasso.com. After unzipping the downloaded folder, in the Bin folder, you'll see a bunch of .exes. I'm using the las2las .exe.

[bdloftin77]

Seems like a few of interest in jeffco, Blackhawk might be of interest to some. Home near summit.

https://listsofjohn.com/mobile/peak/3183

Don't know if all of Clear Creek has been checked yet. Mt Susan?

The demotion candidate list is pretty long.

Looks like Susan's summit has coverage, but the saddle doesn't.

Susan.png

[RyanSchilling]

This page states that the survey foot is being phased out, so does it make sense for this community's use-case?

https://www.nist.gov/pml/us-surveyfoot

[RyanSchilling]

I take your meaning now, thank you!

I meant from meters to feet, apologies. In las2las there’s an option to convert to survey feet (as well as meters and feet) in the Target Projection menu on the right. For consistency you could use this option, though it shouldn’t make too much of a difference for vertical measurements (<0.03 ft).

Sounds like you have a GUI for LasTools? Is this in ArcGIS? I'm using command lines for las2las

Yeah, there's a GUI for las2las which is nice. Here's where I got las2las from: I downloaded lastools from rapidlasso.com. After unzipping the downloaded folder, in the Bin folder, you'll see a bunch of .exes. I'm using the las2las .exe.

Hah, I'd wrongly assumed these were all command line applications!

[bdloftin77]

This page states that the survey foot is being phased out, so does it make sense for this community's use-case?

https://www.nist.gov/pml/us-surveyfoot

Yep, I read that too. It sounds like it'll be phased out sometime this year, which coincidentally is also when the new datum should be nearing completion. As for datums/geoids, we might as well use what we currently have (GEOID12/12A/12B and GEOID18). For survey feet vs international feet for elevations, that's probably a detail that doesn't matter too much for our purposes. So you're right, it's probably best to not worry about that too much.

Hah, I'd wrongly assumed these were all command line applications!

No worries!

[glenmiz]

I've been through the following Jeffco soft-ranked summits and it looks to me like none will become ranked.

Special thanks to Eli; there is absolutely no way I could have done this without the excellent tutorials. Thanks man!

glenmiz LiDar Summary.JPG

[DaveLanders]

Palomino Mtn quad: Peak 12340 (interpolated) near Sugarloaf. There is another point with a surveyed elevation of 12338 about .5 miles northeast that could actually be the summit?

[RyanSchilling]

Palomino Mtn quad: Peak 12340 (interpolated) near Sugarloaf. There is another point with a surveyed elevation of 12338 about .5 miles northeast that could actually be the summit?

A quick & dirty check suggests they're close, but that the interpolated point wins the day:

NE surveyed pt: 3761.91 m (12342.2 ft)
SW interpolated pt: 3762.94 m (12345.6 ft)

[RyanSchilling]

I'm still in the honeymoon phase with this data, astonished at the level of detail.

Take a look at this side-by-side comparison of Quail Mountain's summit... You can see a trail, the depression of an old mine, mining shack remains, the large summit cairn!

[bdloftin77]

I'm still in the honeymoon phase with this data, astonished at the level of detail.

Take a look at this side-by-side comparison of Quail Mountain's summit... You can see a trail, the depression of an old mine, mining shack remains, the large summit cairn!

Isn't it super cool?! I love it. I thought the same thing when I was downloading 1/3 arc second TNM tiles a few years ago. Prettier than many paintings I've seen. And this lidar takes the cake!

[supranihilest]

Hey Ben, can you do a major check of an entire area for me? Whiley reminded me that there's a peak in between "V 9" and San Miguel Peak that, while it may not be ranked, it stands out so much that I wonder if maps of the area are wrong. That said, it will require analysis of an entire ridge. I have approximately half a dozen photos of the ridge from different angles including "V 9", Lake Hope, 13,300 D, and an area far north of the lake, but the ridge is so complex that even when I added colored markers to the photos I still don't know what I'm looking at. I can upload the annotated photos but ultimately it's kind of irrelevant, I think the entire ridge needs to be analyzed starting at San Miguel Peak, going southeast to Point 13,400 (the tri-point of San Miguel, Dolores, and San Juan counties), across to 13,269 (so labeled on Forest Service maps), to "V 9". The point I'm most interested in is 13,269 (red circle in the photos and on the map) which I think has significantly more prominence than shown on maps.

map.png

53EDF8A4-5E01-4B88-B2B9-975A8E65F841.jpg

Whiley also wants a check of "V 9"'s west-southwest sub-summit (blue circle), since it appears to be of nearly identical elevation to the currently accepted summit of "V 9" (orange circle).

20200823_090322.jpg