Covariance field empty

Hello @fabianschenk : I'm just getting started with opensfm. When I checked my reconstruction.json, the covariance field was empty for the data/berlin. How can I enable covariance or get the computed covariance field explicitly?

Also, can you guide me on how I can check or deduce something like a confidence score over the feature descriptors, which feature descriptor is credential and which is not? Is there any utility within the API that I could use to get that?

Thanks in advance for your help.

Start by tracing how reconstruction.json is generated for the data/berlin dataset and review the API documentation for covariance and feature descriptors. Determine whether covariance can be enabled or exposed and whether the API provides descriptor confidence information; document the relevant entry points and a verifiable way to obtain both results.