Some GT / F9P_GNSS / M8T_GNSS files seem to be missing from the official ECMD download folders

[Hyeonwoooo]

Hello, thank you for maintaining the ECMD dataset.

I downloaded and synchronized the files currently available from the official ECMD SharePoint links on April 13, 2026, and then audited my local copy against the public sequence list from the download page.

Current status:

• all expected .bag files are present locally
• many GT, F9P_GNSS, and M8T_GNSS files are also present
• but some sequence-level files still seem to be absent from the official download folders themselves

I also checked the existing open and closed issues in this repository and could not find one that matches these specific missing files.

Could you please clarify whether these files:

1. are available at another official location,
2. were intentionally not released, or
3. correspond to sequences that should not be expected in the public release?

Missing GT pose

Tunnel

• Tunnel_medium_b
• Tunnel_difficult_c

Missing F9P_GNSS

Dense_street

• Dense_street_night_easy_a

Urban_road

• Urban_road_night_easy_a
• Urban_road_night_easy_rainy
• Urban_road_night_medium_a
• Urban_road_night_medium_b
• Urban_road_night_medium_c
• Urban_road_night_medium_d
• Urban_road_night_medium_rainy_a
• Urban_road_night_medium_rainy_b
• Urban_road_night_difficult_a
• Urban_road_night_difficult_b
• Urban_road_night_difficult_c
• Urban_road_night_difficult_rainy_a
• Urban_road_night_difficult_rainy_b

Tunnel

• Tunnel_easy_a

Highway

• Highway_night_medium_a
• Highway_night_difficult_a
• Highway_night_difficult_b

Suburban_road

• Suburban_road_night_medium_a
• Suburban_road_night_medium_b
• Suburban_road_night_difficult

Missing M8T_GNSS

Dense_street

• Dense_street_night_easy_a
• Dense_street_day_medium_a
• Dense_street_day_medium_b
• Dense_street_day_medium_c
• Dense_street_day_difficult

Urban_road

• Urban_road_night_easy_a
• Urban_road_night_easy_rainy
• Urban_road_night_medium_a
• Urban_road_night_medium_b
• Urban_road_night_medium_c
• Urban_road_night_medium_d
• Urban_road_night_medium_rainy_a
• Urban_road_night_medium_rainy_b
• Urban_road_night_difficult_a
• Urban_road_night_difficult_b
• Urban_road_night_difficult_c
• Urban_road_night_difficult_rainy_a
• Urban_road_night_difficult_rainy_b

Tunnel

• Tunnel_easy_a
• Tunnel_difficult_b

Highway

• Highway_day_medium_c
• Highway_night_medium_a
• Highway_night_difficult_a
• Highway_night_difficult_b

Bridge

• Bridge_day_medium_b

Suburban_road

• Suburban_road_night_medium_a
• Suburban_road_night_medium_b
• Suburban_road_night_difficult

Possibly related observation

In the Urban_road GNSS folders, I also found files for:

• Urban_road_day_difficult_a
• Urban_road_day_difficult_b

but I could not match those two sequences to the public sequence list I was using from the download page.

If there is an official public-release manifest for sequence-level artifacts, that would also help resolve this ambiguity.

Thank you.

[cpymaple]

Thank you for your interest in the ECMD dataset. Previously, the dataset was hosted on OneDrive, but due to insufficient storage space, we have had to migrate the data to Baidu Netdisk. The updated download link and extraction code are as follows:

Link: https://pan.baidu.com/s/1K6CLgVzLAjHEfLTlysn4VQ?pwd=sjzr
Extraction code: sjzr

If you have trouble accessing Baidu Netdisk, please let me know and I will try to help further. Thank you for your understanding.

[Hyeonwoooo]

Thank you for the updated Baidu Netdisk link.

I checked the new ECMD_open folder against the sequence-level files I reported earlier. The scenario folders are accessible, but the same missing GT, F9P_GNSS, and M8T_GNSS files still do not seem to be present under the corresponding public-release folders.

I also found some GNSS files under GNSS/cut_data, but their names appear to follow the original recording names rather than the public sequence names, so I cannot confidently determine whether they correspond to the missing public sequence-level files.

Could you please check whether these files may have been omitted during the migration, and if so, provide the missing files or update the Baidu Netdisk folder?

Thank you again for your help.

[cpymaple]

Thank you for the updated Baidu Netdisk link.

I checked the new ECMD_open folder against the sequence-level files I reported earlier. The scenario folders are accessible, but the same missing GT, F9P_GNSS, and M8T_GNSS files still do not seem to be present under the corresponding public-release folders.

I also found some GNSS files under GNSS/cut_data, but their names appear to follow the original recording names rather than the public sequence names, so I cannot confidently determine whether they correspond to the missing public sequence-level files.

Could you please check whether these files may have been omitted during the migration, and if so, provide the missing files or update the Baidu Netdisk folder?

Thank you again for your help.

Thank you for your further checking and feedback.

Regarding the missing GNSS and GT files you mentioned:
For the sequences you listed, we indeed do not have the corresponding raw GNSS data. Due to factors such as tunnels, tall buildings, complex terrain occlusion, and device stability issues during data collection, these sequences lack the raw data. We apologize for this inconvenience. If you do need complete GNSS data, we suggest considering other sequences as alternatives.

Regarding the GNSS/cut_data folder in the Baidu Netdisk:
This was our operational mistake — please ignore that folder. Please continue to refer to the data under the public-release folders as the correct source.

Regarding the GNSS files for the Urban_road_day_difficult_a and b sequences:
Are you referring to issues with the M8T or F9P GNSS data? Or do both have problems? Please let us know so we can better assist you.

Thank you again for your understanding and support.

[Hyeonwoooo]

Thank you for the clarification.

Regarding Urban_road_day_difficult_a and Urban_road_day_difficult_b, I was referring to both the M8T_GNSS and F
9P_GNSS data.

I asked because these two sequence names do not appear in GT_Urban_road or rosbag_urban_road, but files with these names are present in both the M8T_GNSS and F9P_GNSS folders.

Could you please confirm whether these two GNSS files should be used, or whether they should be ignored?

Thank you again for your help