LIDAR LAZ FILE UPLOAD -TRAJECTORY FILE -TIME DATE STAMP MISSING-ERROR MESSAGE

RE: LIDAR LAZ FILE UPLOAD -TRAJECTORY FILE -TIME DATE STAMP MISSING-ERROR MESSAGE

Jason Hagon — Tue, 11 Apr 2023 15:07:43 GMT

Hi Eko Setiawan , I would contact Terrasolid support and explain to them what you are trying to do. Alternatively you can email me at jason@geodronesurvey.com for details of our commercial services.

My recommended workflow would be to import your SBET and export as lat long. More details about the trajectory support in Terrascan can be found here: https://terrasolid.com/guides/tscan/managetrajectories.html

RE: LIDAR LAZ FILE UPLOAD -TRAJECTORY FILE -TIME DATE STAMP MISSING-ERROR MESSAGE

Eko Setiawan — Thu, 06 Apr 2023 06:41:06 GMT

Hi @Jason Hagon, so I trial terrascan and with your guide, I manage to convert timestamp, how do I convert lat long from radian to degree?

RE: LIDAR LAZ FILE UPLOAD -TRAJECTORY FILE -TIME DATE STAMP MISSING-ERROR MESSAGE

Robert Alleway — Thu, 06 Apr 2023 05:08:17 GMT

Hi Eduardo, No I haven't revisited in a little while. I will try again with more recent posts in this thread.

RE: LIDAR LAZ FILE UPLOAD -TRAJECTORY FILE -TIME DATE STAMP MISSING-ERROR MESSAGE

Enrico Pieri — Tue, 04 Apr 2023 15:16:29 GMT

to have GPS time from SOW you have to add GPS time of the previous sunday midnight (you can use this link https://www.andrews.edu/~tzs/timeconv/timeconvert.php? to find gps time of sunday midnight.

Then you have to convert lat/long from radians to degrees and then from lat/long to xy.

so you can edit your excel file and save as txt

RE: LIDAR LAZ FILE UPLOAD -TRAJECTORY FILE -TIME DATE STAMP MISSING-ERROR MESSAGE

Jason Hagon — Tue, 04 Apr 2023 07:52:10 GMT

Please see information here: https://terrasolid.com/guides/tscan/convert-time-stamps.html?q=time

This can be completed for trajectories and point clouds.

RE: LIDAR LAZ FILE UPLOAD -TRAJECTORY FILE -TIME DATE STAMP MISSING-ERROR MESSAGE

Eko Setiawan — Tue, 04 Apr 2023 02:50:35 GMT

Hi Jason Hagon , thank you for your guidance, can you point me to a guide for the process needed to be done in TerraScan for correcting the timestamp?

RE: LIDAR LAZ FILE UPLOAD -TRAJECTORY FILE -TIME DATE STAMP MISSING-ERROR MESSAGE

Jason Hagon — Mon, 03 Apr 2023 07:24:51 GMT

Hi Eko Setiawan , I would suggest using TerraScan if possible. In their software package it is possible to change the timestamp format of both the trajectory and point cloud as well as re-project your data to various coordinate systems. This is likely to be the best solution as there are many potential sources of error when completing these multiple conversions in excel.

RE: LIDAR LAZ FILE UPLOAD -TRAJECTORY FILE -TIME DATE STAMP MISSING-ERROR MESSAGE

Eko Setiawan — Mon, 03 Apr 2023 02:46:42 GMT

hi thank you very much for the respons, in labsat, where do I input SOW to get GPS Time? I try inputting in GPS Second of Week, then stuck there, I don't know which value should i use for the correct timestamp, is there any formula that you can share for converting in excel for time and lat long?

about TerraScan, if i use that software, can i export the correct trajectories from there? and using said trajectories in contextcapture?

RE: LIDAR LAZ FILE UPLOAD -TRAJECTORY FILE -TIME DATE STAMP MISSING-ERROR MESSAGE

Jason Hagon — Thu, 30 Mar 2023 08:53:43 GMT

Hi Eko Setiawan , so you have a point cloud which indicates GPS Time (global encoding 1) and your trajectory is Seconds of Week. The easiest way is probably to change your trajectory, rather than your point cloud. You need to convert your trajectory from Seconds of week to GPS Time and convert radians to Lat Long. There are lots of different ways of doing this, including in excel. Typically we have completed this process using Terrascan software.

RE: LIDAR LAZ FILE UPLOAD -TRAJECTORY FILE -TIME DATE STAMP MISSING-ERROR MESSAGE

Eko Setiawan — Thu, 30 Mar 2023 03:30:55 GMT

Hi, thx for the guidance, so from DJI Terra i already get the .las and sbet.txt with time in SOW as picture below

and i check with lasinfo, the global encoding is 1

so what do i do from here?? what do i need to convert? im sorry for the trouble, kinda new into this, and thx for sparing your time helping me

RE: LIDAR LAZ FILE UPLOAD -TRAJECTORY FILE -TIME DATE STAMP MISSING-ERROR MESSAGE

Jason Hagon — Wed, 29 Mar 2023 08:17:43 GMT

Hi Eko, you need to make sure your trajectory and point cloud have the same time. You can use Las info to find out what the global encoding stamp is inside your .las file. Once this is known (in some examples I have it is 1) you need to ensure your trajectory is in the same format. See some useful links here: https://support.geocue.com/las-global-encoding-bytes-explained/ https://www.labsat.co.uk/index.php/en/gps-time-calculator

RE: LIDAR LAZ FILE UPLOAD -TRAJECTORY FILE -TIME DATE STAMP MISSING-ERROR MESSAGE

Eko Setiawan — Wed, 29 Mar 2023 02:52:58 GMT

Hi, i got LiDAR dataset from Zenmuse L1, can you give me step by step how to solve the mismatch issue using lastool or excel?

RE: LIDAR LAZ FILE UPLOAD -TRAJECTORY FILE -TIME DATE STAMP MISSING-ERROR MESSAGE

Oto — Thu, 22 Dec 2022 13:15:17 GMT

Added such idea proposal - realitymodeling.ideas.aha.io/.../RMI-I-652

RE: LIDAR LAZ FILE UPLOAD -TRAJECTORY FILE -TIME DATE STAMP MISSING-ERROR MESSAGE

Jason Hagon — Thu, 22 Dec 2022 11:59:17 GMT

Yes, LAStools can convert your point between SOW and GPS and update the global encoding. If you need to change your trajectory I would do that in excel.

RE: LIDAR LAZ FILE UPLOAD -TRAJECTORY FILE -TIME DATE STAMP MISSING-ERROR MESSAGE

Peter Jackson — Thu, 22 Dec 2022 11:00:46 GMT

Thanks Jason

So Lastools should be able to solve the conversion / mismatch issue. ?

RE: LIDAR LAZ FILE UPLOAD -TRAJECTORY FILE -TIME DATE STAMP MISSING-ERROR MESSAGE

Peter Jackson — Thu, 22 Dec 2022 11:00:01 GMT

Thanks Oto - how do you get around the mismatch issue ?

RE: LIDAR LAZ FILE UPLOAD -TRAJECTORY FILE -TIME DATE STAMP MISSING-ERROR MESSAGE

Jason Hagon — Wed, 21 Dec 2022 18:16:13 GMT

Hi @ Peter Jackson. You can use LAStools: https://rapidlasso.com/lastools/

If you are struggling I can help in Terrasolid.

Regards,Jason.

RE: LIDAR LAZ FILE UPLOAD -TRAJECTORY FILE -TIME DATE STAMP MISSING-ERROR MESSAGE

Oto — Wed, 21 Dec 2022 15:51:52 GMT

Wasted effort. SOW is the same GPS time.

Problem is with Contextcapture strange way of interpreting data, it is Bentley way or no way.

RE: LIDAR LAZ FILE UPLOAD -TRAJECTORY FILE -TIME DATE STAMP MISSING-ERROR MESSAGE

Peter Jackson — Wed, 21 Dec 2022 12:58:50 GMT

Hi All

I am having the same issues. I have received a las file and the corresponding trajectory files but get a mismatch error.

Been looking on the net to see how i can convert the SOW time to GPS time but not seen anything that works or really makes sense.

% Time

% (SOW)

311612.2129

311612.2179

These are the time stamps i have on my .txt file and the Las file is saying it should be 1.35446e+09

Any idea what conversion method you should use or work flow. We have spoken to Bentley and DJI both say its the others problem.

Pete

RE: LIDAR LAZ FILE UPLOAD -TRAJECTORY FILE -TIME DATE STAMP MISSING-ERROR MESSAGE

pnajarro — Wed, 04 May 2022 23:21:03 GMT

no still can't read trajectory file.

RE: LIDAR LAZ FILE UPLOAD -TRAJECTORY FILE -TIME DATE STAMP MISSING-ERROR MESSAGE

EDUARDO POMBO — Tue, 05 Apr 2022 23:06:07 GMT

Hi Oto, this is what i got using lasinfo in QGIS. It is the first time using Zenmuse L1 and CC so I am not sure if I am doing the whole process as it should be.

RE: LIDAR LAZ FILE UPLOAD -TRAJECTORY FILE -TIME DATE STAMP MISSING-ERROR MESSAGE

Oto — Tue, 05 Apr 2022 10:27:24 GMT

Do report with lasinfo of the cloud and post results.

RE: LIDAR LAZ FILE UPLOAD -TRAJECTORY FILE -TIME DATE STAMP MISSING-ERROR MESSAGE

EDUARDO POMBO — Tue, 05 Apr 2022 05:29:00 GMT

Hi Paul, any later success on this? thanks

RE: LIDAR LAZ FILE UPLOAD -TRAJECTORY FILE -TIME DATE STAMP MISSING-ERROR MESSAGE

EDUARDO POMBO — Tue, 05 Apr 2022 04:28:19 GMT

Hi Robert, did you have some success importing point clouds from L1 into CC? if so, please could you advise about the workflow? thanks

RE: LIDAR LAZ FILE UPLOAD -TRAJECTORY FILE -TIME DATE STAMP MISSING-ERROR MESSAGE

Oto — Thu, 24 Mar 2022 12:17:53 GMT

Because it needs scan locations for calculating direction of normals.