What is the purposes of grid-like pattern route for small aircraft? In these days, I see small aircraft like P68 fly with a very accurate "grid-like" pattern. I'm sorry but I don't know the correct word. Here a couple of examples, grabbed today at the same time:



and



What kind of job they might do with these routes?
I don't think it's about agriculture because the patterns are too long and they fly over cities and sea as well (and I don't think this kind of aircraft is the most suitable for such a task).

I thought about observation of restriction for COVID-19, but I would use helicopters instead of aircraft, and again the patterns are so long for just be sure if anyone goes out for a walk.

Any sort of collecting photographic data? Like Google does for its Maps?
These are most likely photography flights for cartography. Due to the COVID crisis, there are many flights like these lately because it is now easy to obtain permission from Air Traffic Control for these patterns.