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LiDAR scans are finding hidden Roman roads and cutting crime

wired.co.uk

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Re: LiDAR scans are finding hidden Roman roads and cutting crime

#21

Post by RosanaAnaDana »

amelius wrote: post #3

I have a question about self-driving cars (SDCs). Some time ago it was mentioned that SDCs can't use deep-learning because it is not sufficiently reliable, and that instead techniques like LiDAR should be used to recognize objects. However, this made me wonder: how does the car recognize road-signs and traffic lights?

I believe this talk will specifically and completely answer your questions: https://www.youtube.com/watch?v=LSX3qdy0dFg

Short answer: Self driving vehicles do use deep learning, but they avoid some types not because it is unreliable, but it is processing power intense. Traffic lights, road signs, pedestrians etc.. That's a whole ball of wax to unravel. Check the lecture, its fantastic imo.

Re: LiDAR scans are finding hidden Roman roads and cutting crime

#24

Post by lostlogin »

fredley wrote: post #2

For those unaware, all scientific press releases in the UK must express areas in football pitches, and volumes in double-decker buses.

It is unhelpful when it’s 32 million of them, and especially so when the size of a football field is variable.

Re: LiDAR scans are finding hidden Roman roads and cutting crime

#25

Post by mschuetz »

alannala wrote: post #6

Has anyone seen any nice examples of work done with the open LiDAR data?

Was very helpful in creating a point cloud viewer. Not uk but US open lidar data:

- http://potree.org/potree/examples/ca13.html

- http://potree.org/potree/examples/showcase/lake_tahoe.html

Re: LiDAR scans are finding hidden Roman roads and cutting crime

#26

Post by edent »

swebs wrote: post #15
mentos wrote: post #13

Anyone know where I could license/purchase hi-res LIDAR scans for use in game development?

The UK scans are public domain. https://environment.data.gov.uk/ds/survey/index.jsp

Just to clarify - they're not Public Domain. They are released under the Open Government Licence - which is compatible with Creative Commons Attribution 4.0 and Open Data Commons Attribution License.

http://www.nationalarchives.gov.uk/doc/open-government-licen...

Re: LiDAR scans are finding hidden Roman roads and cutting crime

#27

Post by fredley »

gadders wrote: post #17
fredley wrote: post #2

For those unaware, all scientific press releases in the UK must express areas in football pitches, and volumes in double-decker buses.

And height in double decker buses as well.

Actually yes, I think I'm wrong: Double Decker Busses is height, and for volume it's Olympic Size Swimming Pools.

Re: LiDAR scans are finding hidden Roman roads and cutting crime

#28

Post by al2o3cr »

amelius wrote: post #3

I have a question about self-driving cars (SDCs). Some time ago it was mentioned that SDCs can't use deep-learning because it is not sufficiently reliable, and that instead techniques like LiDAR should be used to recognize objects. However, this made me wonder: how does the car recognize road-signs and traffic lights?

Based on this paper, I'd say "poorly".

https://arxiv.org/abs/1707.08945

TLDR: the authors demonstrate that it's possible to apply minor perturbations to signs (for instance, rectangular stickers) that don't significantly change the appearance to humans but cause a classifier to confuse a stop sign with a speed-limit sign.

Re: LiDAR scans are finding hidden Roman roads and cutting crime

#29

Post by gadders »

fredley wrote: post #27
gadders wrote: post #17

Earlier quoted context omitted.

And height in double decker buses as well.

Actually yes, I think I'm wrong: Double Decker Busses is height, and for volume it's Olympic Size Swimming Pools .

Thank God you corrected yourself. Conversion issues like this have derailed spacecraft.
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