Re: Follow-up to GPS article -re UAV's
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No for the Oxford we used a convenient high rise and Nearmap also flew Wollongong towards the end of the project so we had good coverage. It was the site over the road, Dwyers Car Yard formerly the site of the Cricketer’s Arms.
Dr Iain Stuart
P.O. Box 2397
From: LRRSA@... [mailto:LRRSA@...]
Sent: Sunday, 23 October 2016 7:54 PM
Subject: RE: [LRRSA] Follow-up to GPS article -re UAV's
What was the site in Wollongong? Oxford Hotel?
I have some limited experience in using drones for taking aerial images of archaeological sites.
We used a well-known surveying/engineering firm who claimed to provide that capability for an archaeological site I was Excavation Director on. Turns out they lied –they sub-contracted to another specialist supplier of UAV’s. It took a considerable amount of time and organisation to actually get the site flown. Some of this was because it was in an urban area, Wollongong, and the airspace is a little congested as well. We also had to get the supplier down from Sydney, the site pretty much cleaned up and the weather right – i.e. not very windy and not raining. I think a Phantom rotary drone was used.
The outcome was that we got some fly throughs of the site which were very interesting but what we really wanted was overlapping photographic images so we could map the site by using geo-referenced aerial images (we could load these into a Geographic Information System to do the mapping or into Photoscan to create a 3D model ). Although it was claimed that these images were taken during the flight there have been on-going issues getting the data….etc. I suspect that this was because we asked for something that the equipment actually couldn’t supply. Fortunately the site was also mapped using pencil and paper methods.
I had better results with a Trimble set up using their UAV which looks rather line Thunderbird 2 which was optimised for aerial images and less for fly throughs. As a demo The Gatewing was flown over an area of Parramatta park and produced a wonderful aerial image – the whole story is at http://iains-archaeologyheritageandtrains.blogspot.com.au/2014/03/a-different-view.html for those who are interested.
My feelings are that there are fly throughs and aerial photography. Geoff Baxter of Hollywood Foundry has some shot some fly throughs of bridges with a Phantom UAV http://abandonedbutnotforgotten1.blogspot.com.au/ and it thing that gives a good idea of what they can do. However the images are not suitable for mapping and it is unclear whether a Phantom can carry a decent camera.
I think I have a bit more to learn and like many LRRSA members can see the potential but are not sure how to turn it into something useful.
If anyone in the Sydney area wants to experiment/discuss …etc I’d be happy to join in.
Dr Iain Stuart
P.O. Box 2397