Hello, is it possible to import the plane obtained from the classic GPS measurement in the PIX4D software or create plane from .txt file? I have a zero level measurement done and I would like to calculate the volume between the previous measurement and the current measurement made with the drone.
Hi @arturbajko,
Welcome to the Pix4D Community 
.
If you want to compare volume changes between two dates, please follow this procedure:
- Measure the volume on the project acquired on date 1. Make sure you choose the best base surface according to your project (https://support.pix4d.com/hc/en-us/articles/217114246-Which-Base-Surface-is-recommended-for-the-Volume-Calculation)
- Export the volume base (https://support.pix4d.com/hc/en-us/articles/211245943-How-to-export-Volumes).
- Open the project acquired on date 2 and import the volume base (https://support.pix4d.com/hc/en-us/articles/204836569-How-to-import-a-volume-into-Volumes)
- Calculate the volume
- Compare the volumes obtained on steps 1 and 4.
Let me know if this helps you.
Happy mapping!