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How to obtain coordinates from Autotags? - PIX4Dcatch

This article provides step-by-step instructions for using the tag detection feature to extract Autotag coordinates. This workflow enables accurate measurement of multiple points within a project.

Instructions on obtaining Autotag coordinates:

  1. Evenly distributed Autotags across the project area.
    image-png-Sep-26-2024-01-27-03-5961-PMimage-png-Sep-26-2024-01-27-39-5782-PM

  2. On the PIX4Dcatch home screen, tap Capture at the bottom.

  3. Before starting to capture a project, tap the Tools icon in the bottom right corner.

  4. Select Tag Detectionautotag icon. 
    PIX4Dcatch tag detection import point collection

  5. Turn on Detect Autotags under the Tie Points section. Tap Done.

     

  6. Start capturing. Ensure Autotags are clearly detected in at least three images.   PIX4Dcatch tag detection enabled

  7. Once the capture is done, save the dataset.

     PIX4Dcatch save dataset with GCPs

  8. Open the captured project in the project folder at the bottom. 
  9. Tap the three-dot icon Pix4dcatchexport_icon-1 at the top and select Optimize
    PIX4Dcatch open project optimize autotag-1
  10. Once the optimization is finished, tap the three-dot icon PIX4Dcatch three dot icon at the top-right corner.

  11. Select Create Point Collection from Tie Points.

    PIX4Dcatch create point collection from TPs

  12. Name the point collection. Select the output coordinate reference system.

  13. Tap Create in the top right. PIX4Dcatch will display a list of points with their coordinates. To check their geographical distribution, tap the map icon Map view icon in the top-right corner.

     PIX4Dcatch create point collection from TPs RTK

  14. To export coordinate data, tap the export icon on the top. Select the desired export method for the .zip file.

PIX4Dcatch export GCPs

export method

Note: The Tag Detection feature can also be activated post-capture through the Optimize Autotags workflow. The subsequent processing steps remain unchanged.