Just a couple things here. First, TBC works better with LAS versus LAZ files so I'd recommend avoiding any use of LAZ. Second, can you confirm if you set your coordinate system/datum, geoid model, and units prior to brining any data in? Third, when you bring the las/laz file into TBC, are you choosing Grid scaled in the project's system or ground, or manually specify the system? Lastly, ensure you are working in the 2011 realization of NAD83 in Topo Dot, as you cannot use legacy realizations of Nad83 within TBC. Honestly, it should be supported in Topodot either!
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Zach Edwards
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Original Message:
Sent: 02-10-2026 11:08
From: M_ Hufford
Subject: TopoDOT LAS/LAZ Export into TBC Not Matching
Another thing I've noticed but forgot to mention is sometimes the first time you bring in a point cloud it will shift a few feet, but when you delete and bring it in again, or bring it in again on top of itself, it lines up perfectly. I never determined why this happens.
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M Hufford
Original Message:
Sent: 02-10-2026 11:04
From: Seth Zora
Subject: TopoDOT LAS/LAZ Export into TBC Not Matching
Everything is in US Survey Feet. The weird thing is the break lines I am drawing in TD and importing into TBC are lining up perfectly. TBC is in PA S USSF. When pulling in the LAZ I specified USSF. LAS didn't ask.
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Seth Zora
Original Message:
Sent: 02-10-2026 07:59
From: M_ Hufford
Subject: TopoDOT LAS/LAZ Export into TBC Not Matching
US Survey Feet vs International Feet? What are the TopoDOT coordinate system settings? What are the TBC coordinate system settings and units? What settings did you select in the dialog box when importing the point cloud into TBC?
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M Hufford
Original Message:
Sent: 02-10-2026 06:53
From: Seth Zora
Subject: TopoDOT LAS/LAZ Export into TBC Not Matching
I'm doing some working in TopoDOT and exported a new point cloud that I have tried as an LAS and LAZ and they are shifted up and to the right. I reimported the same files back into TopoDOT and they align perfectly. Any suggestions?
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Seth Zora
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