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That works best for leveling trenches left by concrete extractors and some nearly-level terrain. And in some instances, it will cause the drones to get rid of pesky rocks that would otherwise prevent placement of things.

I do wish they would put in a ground "grader" machine so we could flatten out some of the bumpier parts of the terrain - like the areas the transports and drones can drive through but aren't "level" for placing things down.
 
I used to put down several waste rock sites to level old concrete pit. I recently discovered that pausing time and putting domes on top of the old pits then cancelling them immediately is the best. Very best. It only takes five seconds or so. I suggest.

Wish you the best,
Fonur
 
Actually, I found the newly added landing area for rockets does a great job at leveling a large area. It doesn't even need to be completed, the ghost alone levels the land so you can delete it right after before it gets built.