>Why you guys think they fly patterns over and over at the same spot?
All of the planes are registered to some
"2115828 Ontario Inc." (Trade Name First Base Solutions)
https://wwwapps.tc.gc.ca/saf-sec-sur/2/ccarcs-riacc/DDZip.aspx
https://www.ontario.ca/page/eligibility-list-registered-air-operators
"First Base Solutions" seems to be doing aerial imagery, geospatial data and stuff like that.
So they're probably mapping/imaging the area.