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Welcome to the wonderful world of ‘alternative data’

You can similarly track certain flights to certain places.

https://www.cnbc.com/2019/04/30/a-corporate-jet-revealed-buf...

There was a bunch of analysis over on /r/wallstreetbets a while back based on satellite imagery of roads in China, using them to estimate coronavirus recovery levels for factories there.

Where do you get up to date satellite imagery?

https://www.planet.com/ has 3-5 meter resolution satellite images updated daily for almost all the land surface in the world. Their business model is to launch many lower power and resolution satellite with a few year life rather than launching a few super big and expensive satellite.

Clients can then get historical imagery of a target location to track daily developments (for things like deforestation, crop health, etc.).