The "Thin LiDAR Line of DEATH!!!"

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kdjacob
Posts: 5
Joined: Thu Mar 06, 2025 3:28 pm
Location: Boston, USA

The "Thin LiDAR Line of DEATH!!!"

Post by kdjacob »

I'm relatively new to CloudCompare.

I'm running CC 2.13.2 on a MacBook with Apple Silicon M1. Attachment 0 is a screenshot with more exact info on my build.

Attachment 0.jpg
Attachment 0.jpg (31.51 KiB) Viewed 328 times

I've been successfully downloading .laz files from two sites: NOAA and USGS (see links below).

The .laz files from USGS load beautifully into CC but the files from NOAA result in the "Thin Line of Death" (Attachment 1).

Attachment 1.jpg
Attachment 1.jpg (41.55 KiB) Viewed 328 times

There are multiple threads about this issue from others, and it seems from reading other threads that the NOAA files are doing this because of their spherical coordinates when CC wants cartesian coordinates. In Attachment 2 it looks to me like the X and Y are in degrees and Z is a length, which probably confirms the source of the problem.

Attachment 2.jpg
Attachment 2.jpg (139.62 KiB) Viewed 328 times

I've tried a number of ways to convert the NOAA files into something that uses a cartesian CRM -- like converting to UTM in QGIS -- but nothing I've tried has worked.

In Attachment 3 and Attachment 4 I show the results of running two files (one from NOAA and the other from USGS) through LAStools lasinfo, in case that information might be helpful.

I would appreciate any advice on how I might go about fixing this problem?

Thanks,

Ken


USGS Site: https://apps.nationalmap.gov/lidar-explorer/#/
NOAA Site: https://coast.noaa.gov/dataviewer/#/lidar/search/
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