I am happy to tell that it is so easy to make fantastic orthophotos and 3d models by WebODM. Also, position accuracy without GCP are still good enough for my usage such as about 1 m difference depend on number of pictures. It is also impressive to show orthophoto on QGIS from my UAV photos.
Also, I have two problems such as unable to export kmz files from the menu setting and unable to update following message “title: cannot check for update message: certificate has expired, check for WebODM Drone Software - OpenDroneMap for update”. I found solution of kmz file problem from this community.
These are my impressions. Thanks for working webODM software.