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Mr. Nicholas Johnson

USACE

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USACE

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Advancing Bathymetric Lidar Through Community Practices - guest review

Posted By Mr. Nicholas Johnson 11-07-2025 05:29 PM
Found In Community: WG - Lidar - Bathymetry - Public Events
Please join a conversation with guest Dr. Gottfried Mandlburger and Nicholas Johnson for a conversation about bathy lidar depth biases, water surface fun, and other signal processing challenges we face. We'll share a brief of the paper on the topics which can be reviewed before meeting. https://is ...

Nov meeting - discussion

Posted By Mr. Nicholas Johnson 10-15-2025 12:29 PM
Found In Egroup: WG - Lidar - Bathymetry - Public \ view thread
Busy busy world in bathy lidar and all apologies on the time gap since our last meeting. I am working on a researcher guest mid November to provide comments on my paper submitted to ISPRS, Clear Waters, Stronger Depths: Advancing Bathymetric Lidar Through Community Practices. I've shared these thoughts ...

RE: Bottom detection algorithms - how best to share this information?

Posted By Mr. Nicholas Johnson 06-16-2025 01:12 PM
Found In Egroup: WG - Lidar - Bathymetry - Public \ view thread
06/09/2025 meeting notes - Please feel free to add comments and support clarifying our needs. I shared CZMIL bathy lidar data and some of what I noted as "fuzzy" turbid water algorithm data. I also showed bathymetry class 40 data which used class 41 detected surfaces and ones that used class 42 modeled ...

BWG Monthly - Algorithms for detecting the bottom

Posted By Mr. Nicholas Johnson 05-19-2025 02:50 PM
Found In Community: WG - Lidar - Bathymetry - Public Events
Chat about interest point algorithms and how we can help share information to help the end users. Apologies about the time confusion. The meeting is set 1300CDT.

Bottom detection algorithms - how best to share this information?

Posted By Mr. Nicholas Johnson 05-19-2025 02:16 PM
Found In Egroup: WG - Lidar - Bathymetry - Public \ view thread
As systems and processes evolve and advance, we continue to see new approaches to identifying the bottom. Traditional peak detection methods continue to be used where we have the data but we are now seeing image approaches, AI strategies, turbid water, shallow water, waveform stacking, area averaging, ...

Confidence - request to add class or confidence values to the bathy domain profile

Posted By Mr. Nicholas Johnson 05-19-2025 02:02 PM
Found In Egroup: WG - Lidar - Bathymetry - Public \ view thread
Chris Parrish recently requested a class 49 low confidence bathy point be added to the bathy domain profile. A few from the community joined Parrish on a call on 5/12 to discuss. I've updated the bathy domain profile thread at Update topobathy LDP to v2 · Issue #117 · ASPRSorg/LAS. We talked about ...

Bathy Lidar Confidence - What comes to mind?

Posted By Mr. Nicholas Johnson 04-30-2025 02:10 PM
Found In Community: WG - Lidar - Bathymetry - Public Events
Dr. Christopher Parrish and I , along with the community will discuss confidence when it comes to bathy lidar. What and where do we go as a community and what information would help the technology and use of the data?

Bathy Sub Working Group - Calibration Best Practice Effort Meeting

Posted By Mr. Nicholas Johnson 12-12-2024 01:08 PM
Found In Community: WG - Lidar - Bathymetry - Public Events
What does the community need in a bathy lidar calibration report? Lets see what we have so far, Overview and Simple Outline hopefully

RE: BWG Wiki Wishlist

Posted By Mr. Nicholas Johnson 12-12-2024 01:02 PM
Found In Egroup: WG - Lidar - Bathymetry - Public \ view thread
See our wish list on the shared drive. These are from some past conversations and todays meeting. We will mine and sort this list to keep a shorter list on our WIKI!!! More are joining the calls and speaking up. I appreciate the support and ideas! ------------------------------ Nicholas Johnson ...

Bathy Sub Working Group - Calibration Best Practice Effort Meeting

Posted By Mr. Nicholas Johnson 12-10-2024 05:44 PM
Found In Community: WG - Lidar - Bathymetry - Public Events
What does the community need in a bathy lidar calibration report? Time: Dec 12, 2024 10:00 AM Central Time (US and Canada) Every 14 days, until Feb 20, 2025, 9 occurrence(s) Please download and import the following iCalendar (.ics) files to your calendar system. Daily: ...

RE: Vertical Uncertainty-Accuracy, Calibration to processing to validation - sub-group

Posted By Mr. Nicholas Johnson 12-09-2024 04:21 PM
Found In Egroup: WG - Lidar - Bathymetry - Public \ view thread
Thanksgiving week dropped our last meeting and the next meeting for every other week after this Thurs is Dec 26th so I'll drop that as well. See yall Thur 12/12 at 10am Central. Meeting links will be the same as the postings above but I'll share again below. I was about to add an event for this week ...

RE: Vertical Uncertainty-Accuracy, Calibration to processing to validation - sub-group

Posted By Mr. Nicholas Johnson 11-12-2024 11:49 AM
Found In Egroup: WG - Lidar - Bathymetry - Public \ view thread
I corrected my last comment as I copied the event details from my email with ASPRS when setting up a reoccurring meeting which had the date from our last meeting. Next calibration conversation will be When: Nov 14, 2024 from 10:00 AM to 11:00 AM (CT). See our events page. ------------------------------ ...

RE: Vertical Uncertainty-Accuracy, Calibration to processing to validation - sub-group

Posted By Mr. Nicholas Johnson 10-31-2024 04:05 PM
Found In Egroup: WG - Lidar - Bathymetry - Public \ view thread
A smaller group today but coming off an awesome week at the JALBTCX workshop, not that bad. I've asked those that attended to check out Lockhart_TPU and ChatGPT docs through our resources-drive link under the Examples-Specs directory for our next call to discuss accuracy and precision metrics and ...

RE: Vertical Uncertainty-Accuracy, Calibration to processing to validation - sub-group

Posted By Mr. Nicholas Johnson 10-26-2024 12:25 PM
Found In Egroup: WG - Lidar - Bathymetry - Public \ view thread
SEE YALL Thursday!!! Topic: Bathy Sub Working Group - Calibration Best Practice Effort Meeting Time: Oct 31, 2024 10:00 AM Central Time (US and Canada) Every 14 days, until Feb 20, 2025, 9 occurrence(s) Please download and import the following iCalendar (.ics) files to your calendar system. ...

RE: Cork Sniffing flights.

Posted By Mr. Nicholas Johnson 10-26-2024 12:23 PM
Found In Egroup: WG - Lidar - Bathymetry - Public \ view thread
The BWG meeting we had Friday at the workshop, though not advertised as the BWG meeting, worked through a number of items with this being a big one, Risk Management. Part of this is education and use of language/managing expectation but we all need to make sure we acquire the data intended and communicate ...

Bathy Lidar Sampling and Feature Resolution: Theory to Practice

Posted By Mr. Nicholas Johnson 10-23-2024 10:53 AM
Found In Egroup: WG - Lidar - Bathymetry - Public \ view thread
I will be presenting "Bathy Lidar Sampling and Feature Resolution: Theory to Practice" at the JALBTCX workshop today and wanted to make this presentation available following questions. Minsu Kim will be following my talk though his presentations aren't the easiest to guide oneself through. We are also ...

RE: Vertical Uncertainty-Accuracy, Calibration to processing to validation - sub-group

Posted By Mr. Nicholas Johnson 10-17-2024 03:32 PM
Found In Egroup: WG - Lidar - Bathymetry - Public \ view thread
All, Until we meet, maybe have a little fun and add comments to the "CHAT GPT - Bathy Lidar Cal - fun" google doc at ,https://docs.google.com/document/d/18dbL5pwOyUtwZWt2kpUlu0-uDwxU7xUHXH3KRN9lOh8/edit?usp=drive_link, which you can get to through our community pages via the library tab. I ...

RE: Vertical Uncertainty-Accuracy, Calibration to processing to validation - sub-group

Posted By Mr. Nicholas Johnson 10-17-2024 03:26 PM
Found In Egroup: WG - Lidar - Bathymetry - Public \ view thread
AL, I'm good with that time as well, 10 ET. I've reached out to Yuki to see if I could manage a sub-group via my own outlook or if I've misunderstood some of the group/event management functions with these community pages. ------------------------------ Nicholas Johnson Physical Scientist ...

RE: Vertical Uncertainty-Accuracy, Calibration to processing to validation - sub-group

Posted By Mr. Nicholas Johnson 10-17-2024 11:44 AM
Found In Egroup: WG - Lidar - Bathymetry - Public \ view thread
Hey Everyone! Apologies for the confusion with the meeting and then the late calendar add. For those that have responded in this discussion as interested in a calibration guideline / reporting best practice for our wiki, or for those that do want to join, how does every other Thur 10am central starting ...

RE: Vertical Uncertainty-Accuracy, Calibration to processing to validation - sub-group

Posted By Mr. Nicholas Johnson 10-10-2024 04:44 PM
Found In Egroup: WG - Lidar - Bathymetry - Public \ view thread
Oct 17th 1300 central is taken in the ASPRS Calendar. I'll put in for 9am central. Between the JALBTCX workshop and some storm related work, I will not have new info to present but would love to continue our talk from where we left off. When and where do we need bathy related calibration values for different ...