Where to find high resolution images of the game map?

Does anybody know if it is possible to somehow get a high resolution image out of playrust.io or other similar tools?

Ideally I want to make a high resolution poster, printed on a large format printer.

You know those tables in old war movies that have a map of the battlefield, generals placing pins and noting where their units are?

I want to make something similar.

I used the Snipping Tool