I have a problem with the data elaboration of a point cloud collected with L2. With the new software DJI TERRA updates I cannot avoid the removal of points from my clouds when there is poor POS. I just processed a point cloud and I lost some points...but the same survey, processed the 2024-10-11 in the old version of DJI TERRA was complete and no problem with the point cloud (that was complete).

I have no possibility to use PPK post-differential processing, because I did not use any other positioning support apart of the RTK connected with internet and, at least at the beginning of the flight, in FIX.

Having already processed the point cloud in a past process in DJI TERRA, there should be a way to tell the software the reconstruct even if the POS is poor... Can you help me with that? I cannot do the survey again...

Thank you!

Hi there. Thank you for reaching out. We have reported your issue to our engineer and will get back to you as soon as we have a response. Thank you for your understanding and patience.

Hi there. After importing radar data, DJI Terra will detect the accuracy of the operation and have relevant prompts. However, it is not possible to reconstruct this function without data with poor positioning, because DJI Terra itself requires fixed solution (FIX) data or PPK processing.
If you have other questions, please feel free to contact us.

Hello, thank you for your kind reply. I am working with LiDAR data and not radar, I acquired L2 RGB point cloud data. I read the warning that you are showing me, before to open this discussion here. The only thing that I cannot understand is why I reconstructed the point cloud with an older update of the DJI TERRA software and the point cloud was fully reconstructed while now, if I use the same dataset, with this new update introducing the "POS status", DJI TERRA is no more able to give me the entire point cloud. That's weird, do you mind?

Even if I have a stripe with poor POS status I must be able to extract the total point cloud, having already done it before. The data is here, but DJI TERRA is not  giving me it...

SistemiForestal Posted at 2-4 00:43
Hello, thank you for your kind reply. I am working with LiDAR data and not radar, I acquired L2 RGB point cloud data. I read the warning that you are showing me, before to open this discussion here. The only thing that I cannot understand is why I reconstructed the point cloud with an older update of the DJI TERRA software and the point cloud was fully reconstructed while now, if I use the same dataset, with this new update introducing the "POS status", DJI TERRA is no more able to give me the entire point cloud. That's weird, do you mind?

Even if I have a stripe with poor POS status I must be able to extract the total point cloud, having already done it before. The data is here, but DJI TERRA is not  giving me it...

Hi there. Thanks for your question. We have fed it back to the engineer.

SistemiForestal Posted at 2-4 00:43
Hello, thank you for your kind reply. I am working with LiDAR data and not radar, I acquired L2 RGB point cloud data. I read the warning that you are showing me, before to open this discussion here. The only thing that I cannot understand is why I reconstructed the point cloud with an older update of the DJI TERRA software and the point cloud was fully reconstructed while now, if I use the same dataset, with this new update introducing the "POS status", DJI TERRA is no more able to give me the entire point cloud. That's weird, do you mind?

Even if I have a stripe with poor POS status I must be able to extract the total point cloud, having already done it before. The data is here, but DJI TERRA is not  giving me it...

Hi there, we appreciate your kind patience. After checking with our engineer team, the new version of DJI Terra (4.3.0 and later) has higher requirements for POS quality in order to reduce noise and obtain better point cloud results, so data with poor POS accuracy will be eliminated, which leads to the problem encountered by customers. If you do not want to eliminate LiDAR data with poor POS, you can use DJI Terra versions before 4.3.0. If you need further assistance, please don't hesitate to contact us. Thank you.

Thanks for your reply. Where can I find the older versions and download them?

SistemiForestal Posted at 2-6 00:39
Thanks for your reply. Where can I find the older versions and download them?

Hi there, you can check it from this path on our DJI official website: Download Center>>>DJI Terra>>>Manuals>>>DJI Terra Earlier Version>>>download the PDF. (https://www.dji.com/global/downl ... b6-b800dff3a9cf#doc) If you need further assistance, please feel free to let us know. Thanks for your kind patience and have a wonderful day.

DJI Mindy Posted at 2-6 01:14
Hi there, you can check it from this path on our DJI official website: Download Center>>>DJI Terra>>>Manuals>>>DJI Terra Earlier Version>>>download the PDF. (https://www.dji.com/global/downloads/products/dji-terra?workspace=3424dbb9-e761-485a-8db6-b800dff3a9cf#doc) If you need further assistance, please feel free to let us know. Thanks for your kind patience and have a wonderful day.

Thank you for your support.
I downloaded the older version but now compare the following warning at the beginning of the point cloud processing phase: "The pose data is abnormal, please check the base station data and RTK data, and perform calibration flight before and after collecting the data".

1) during the flight, I did the IMU and LiDAR calibration (sensor L2)
2) during the flight, no RTK warning has been detected on the DJI Matrice 350RTK controller
3) I have processed the same point cloud some month ago and it worked (I hace it on my pc, processed) and now DJI TERRA blocks the reconstruction at the beginning.

I really do not know how to proceed.
Is there a DJI support where I can send all the folders of the flights and they can check if they can do something? It seems really strange and I do not know how to solve it!

Thanks a lot!

Best wishes

SistemiForestal Posted at 2-13 08:05
Thank you for your support.
I downloaded the older version but now compare the following warning at the beginning of the point cloud processing phase: "The pose data is abnormal, please check the base station data and RTK data, and perform calibration flight before and after collecting the data".

Hi there. Please try the troubleshooting steps below:

1. Verify that DJI Terra v3.6 or later is used. (In DJI Terra v3.5 and earlier, some base station data in RTCM 3.2 format cannot be parsed. That is, photos can be fixed while point-cloud data cannot. )

2. Please check whether the base station data and RTK data are missing.

3. Make sure that IMU Calibration is enabled during flight missions.

4. During manual flight, calibration flights before and after data collection:
Zenmuse L1 performs an IMU calibration every 100 seconds during flight;
Zenmuse L2 performs an IMU calibration every 200 seconds during flight.

5. Please make sure that a protocol type supported by DJI Terra is used:
RTK/PPK Protocol Signal Formats and Usage Limitations Supported By Zenmuse L1 Data Post-Processing
RTK/PPK Protocol Signal Formats Supported by Zenmuse L2 Data Post-Processing and Usage Limitations

6. Ensure that the base station uses data from at least 3 GNSS, and that the distance between the operating area of the device and the third-party base station is within 15 km.

If the issue persists after the abovementioned operations have been tried, please send us raw data for further analyze.

Thank you for your kind reply.

I am going to check the point 5....the other points should have been already respected.

How can I proceed for the raw data? At wich conctact should I write?
thanks

SistemiForestal Posted at 2-14 04:23
Thank you for your kind reply.

I am going to check the point 5....the other points should have been already respected.

Hi there. You can upload the original data to this network disk: https://pan-sec.djicorp.com/s/nqo7tNgSPkrysqA
We will help you submit it to the engineer for analysis.

Thanks.
I have uploaded the original dataset from my sensor L2 (DJI_202407091103_009_GenevrisW), the one that, if I start the point cloud processing phase, warns be with the following: "The pose data is abnormal, please check the base station data and RTK data, and perform calibration flight before and after collecting the data".

I also have included another dataset of the same area but a missing upper part (DJI_202407100956_010_GenevrisW-uppermissingpart-L2).

Moreover, I uploaded the point cloud that I was able to process with those two datasets. With the same point cloud processing steps that are not more working now (just to show that the data is present, something was collected during the flight mission...).

Thanks a lot!

Good morning, do you have any news about our shared data? Thanks a lot.

SistemiForestal Posted at 2-27 01:01
Good morning, do you have any news about our shared data? Thanks a lot.

Hi there, we appreciate your patience and understanding. When processing data using DJI Terra 4.4.6, our engineering team did not encounter the error you described. Thus, we recommend that you try processing this data again using DJI Terra 4.4.6. As for the point cloud missing issue you described, both of your data sets are in the RTK non-FIX state, which makes some point cloud data unable to be parsed, so there is a missing phenomenon. We sincerely hope this information proves helpful. Thank you!