I admire the op's interest in looking into all of the possibilities. Precise drone taken measurements almost has to be possible if you are willing to invest a lot of time and money.
Let's say you invest a few $ thousand on the low side, or...
There's a standard solution for this that doesn't include drones. It's called an approved set of building drawings stamped by engineers and architects, and site visits.
Engineers and architects routinely make site visits while jobs are underway...
Slup is 100% right. The flags represent approx 15-20mph winds, and were perhaps filmed at a different location or time than the flight.
We licensed regular aircraft pilots, and many drone pilots who fly in high wind areas like the Obx in Nc...
am not recommending flying to less than 10% battery or not even to less than 20 , but in real world thing really happen. i recalll from the phantom days where i was capturing a celebration and the fire works started when i was 15% with the...