5-10cm. accuracv should be normally achievable under most circumstances on RTK/PPK only, but you do need some sort of checking to pick up when it goes...
We found problems with Pix4D not being able to correctly use UK datums. Photoscan handles UK transforms much better. GCP's with PPK appear to tighten ...
Exactly what we have found with another system. For RTK/PPK you need a minimum of 3 GCP. As few more are helpful if they can be put in without much ad...
We normally put an plan offset onto the ground floor threshold level, to throw it inside the building - that way there isn't any doubt that it is inte...
It all depends on the client and what they understand by 3D. Take it exactly as it is stated and the survey is a full scan point cloud. Most clients s...
Nice image Bisenberger. We've found similar results. See article starting on page 23 in Geomatics World.
It's out now! ??ÿ
We use Photoscan - to date only LIDAR seems to be able to get really consistent extraction of ground from under vegetation (note I said consistent rat...
We allow for some field work to check and "calibrate" the vegetation. The guy fixing the GCP also records as he walks between those locations picking ...
Yes, one advantage of the UK is you can pick days when the sun isn't out. As long as there is only a short gap between the flights then the shadows sh...
I would completely disagree with your 30 acres. The FAA rules are similar to those in the UK, except that the UK specify a normal maximum horizontal d...
This only works when the airport is small and quiet. Some years ago I had to do something similar at the main airport on Malta (Luqa). Trying to threa...
If the aircraft is so low that it hits the trees then it was going to hit something anyway. Nobody intentionally flies to miss obstructions by 3 ft.
Does it depend on who has commissioned the work? I've just had a quick look at the FAA guidance document and outside the airport boundary it appears t...
Given that for an obstruction survey you don't need tree "heights", just the canopy elevation then drone photography processed without any filtering s...
If you are intending to use these over an extended period of time, once you have worked out the maximum distance reduce it by a third - to allow for a...
Peter, I chose aluminium rather than stainless steel for the weight aspect. We quite often have to use the poles to pick detail within high undergrowt...
Factual correction - you applied your conversion the wrong way round, 23mph is 20 kts. With an A6000 on board you should be able to fly at 200ft+ and ...