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Importing ASCII photo position file and assigning camera GPS/IMU offsets

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  • Importing ASCII photo position file and assigning camera GPS/IMU offsets

    I have photos with no EXIF position data, but have a separate ASCII file that has the photo name, and the GPS position
    when the photo was taken. The file has the following format:

    pix PIX_lat PIX_lon PIX_nad83h Accuracy_Z Flash_Ztime Q ns sdu g ps_sow
    2022-0613-200912-DSC08499-N7251F.jpg 39.578955543 -75.575058360 275.519 0.118011 2022-06-13 20:09:10.999320116 1 9 0.0090 1 days 20:09:28.999320120
    2022-0613-200913-DSC08500-N7251F.jpg 39.579121685 -75.574549556 276.005 0.118211 2022-06-13 20:09:11.995901676 1 9 0.0091 1 days 20:09:29.995901680
    2022-0613-201009-DSC08501-N7251F.jpg 39.588667235 -75.544882511 305.969 0.113011 2022-06-13 20:10:08.018459876 2 9 0.0065 1 days 20:10:26.018459880
    2022-0613-201010-DSC08502-N7251F.jpg 39.588895739 -75.544374863 307.654 0.113011 2022-06-13 20:10:09.020219036 2 9 0.0065 1 days 20:10:27.020219040
    2022-0613-201012-DSC08503-N7251F.jpg 39.589365267 -75.543383739 312.145 0.113011 2022-06-13 20:10:11.023728436 2 9 0.0065 1 days 20:10:29.023728440
    2022-0613-201013-DSC08504-N7251F.jpg 39.589622520 -75.542914896 312.729 0.113011 2022-06-13 20:10:12.022151876 2 9 0.0065 1 days 20:10:30.022151880


    I also know the offset in XY&Z of the camera to the GPS antenna. How can I import this information
    into 3DF Zephyr? I do not want to "burn" the positions into EXIF, as I need to be able to re-process
    with new PPK or different PPK data as part of the work flow.

    I am looking at migrating to 3DF from Metashape. Metashape has had the ability to do this for many years
    and I'm hoping 3DF can also do this, or be modified to do it.

    -Wayne


  • #2
    Hi Wayne,

    you can indeed import cameras as constraints from a text file, althought it requires the full version of 3DF Zephyr (3DF Zephyr Free and 3DF Zephyr Lite do not have this functionality). Make sure to check "Import Camera Position Constraints" in the wizard when starting a new project in order to feed the txt file to zephyr.

    If you want to share your dataset with us we will be happy to take a look at it if there are specific parts of the workflow that you need help with

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