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Low-Pass Filter posted:I've worked with one of these things before; slap it on continuous rotation servo, or somethign with a slip-ring, and you can make a little room scanner! One of the customers at my computer shop was a marble and granite shop, and they had one of these too. theyd put it on a tripod, let it scan the room and it would drive the marble countertop saws to cut the exact profile of your walls on the back edge so you didnt have any gaps. I helped them fix it one day when a wire came loose. soldering iron and everything. they were amazed
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Mar 22, 2018 17:42
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go play outside Skyler posted:i want to play with a fuckin' lidar now pretty much any surveying company will have one these days, the tech got cheap gently caress you if you need to store point cloud data for them, though
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Mar 22, 2018 17:42
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also this one was good too but i think the amazon thread is dead now https://twitter.com/cashbonez/status/976707778596057088
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Mar 22, 2018 17:43
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Low-Pass Filter posted:I've worked with one of these things before; slap it on continuous rotation servo, or somethign with a slip-ring, and you can make a little room scanner! or just buy a used kinect
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Mar 22, 2018 17:44
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same
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Mar 22, 2018 17:45
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BangersInMyKnickers posted:pretty much any surveying company will have one these days, the tech got cheap well, "cheap" means it's dropped from 1.5 Million to $150k. Survey grade poo poo is $$$$ but yeah, you bring up a good point, often acquiring data is easy/cheap, but manipulating it in a meaningful way is both very expensive and very time consuming.
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Mar 22, 2018 17:47
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BangersInMyKnickers posted:pretty much any surveying company will have one these days, the tech got cheap we’re finally getting lidar imagery for the municipality i work for. i can’t loving wait to start playing with it. i wonder how pissed the IT guy would be if i tried to generate and store a 36 square mile point cloud..... 
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Mar 22, 2018 17:48
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BangersInMyKnickers posted:pretty much any surveying company will have one these days, the tech got cheap yeah i remember back in like 2011 when it was the hot new thing now that it had gotten cheap enough to take off of an airplane and mount onto a 4-wheeler for $insane
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Mar 22, 2018 17:48
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Low-Pass Filter posted:I've worked with one of these things before; slap it on continuous rotation servo, or somethign with a slip-ring, and you can make a little room scanner! i wish i had any reason at all to own and use a lidar
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Mar 22, 2018 17:49
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President Beep posted:we’re finally getting lidar imagery for the municipality i work for. i can’t loving wait to start playing with it. If I remember right a single building will clock in at somewhere around 50gb for standard resolution surveying. You can probably get away lower res depending on your needs but you're going to probably need tens to hundreds of TB in storage arrays to house that scale of surveying and big loving SDD scratch disks on the workstations to copy them to when they're being manipulated
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Mar 22, 2018 17:51
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BangersInMyKnickers posted:If I remember right a single building will clock in at somewhere around 50gb for standard resolution surveying. You can probably get away lower res depending on your needs but you're going to probably need tens to hundreds of TB in storage arrays to house that scale of surveying and big loving SDD scratch disks on the workstations to copy them to when they're being manipulated lol. gently caress. i knew it’d be big... e: at least i can make those sweet, sweet hillshades. way better than the low-res DEM that i’m stuck with currently.
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Mar 22, 2018 17:52
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nevermind trying to render the point clouds
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Mar 22, 2018 17:52
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infernal machines posted:or just buy a used kinect kinects are cool as poo poo too, but they're not lidar. they project a specfic dot pattern in infrared onto things, then use a pair or IR cameras a set distance apart, then derive distance or depth using triangulation.
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Mar 22, 2018 17:53
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yeah, i guess it comes down to what you want it for, i meant in terms of "thing i can plug in and use to make a 3d map of a space for very cheap"
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Mar 22, 2018 17:56
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kinect: the product that tanked so hard apple decided to cram it into their phones
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Mar 22, 2018 17:59
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hobbesmaster posted:nevermind trying to render the point clouds That part isn't too bad. This was a couple years ago but memory consumption was floating around 4gb for the viewer. It's going to depend on what the scale of your dataset is but the captures do multiple passes at different resolutions and what pass you is loaded in ram is dictated by the zoom level. That could vary based what software you are using, but it was very doable on mid-range hardware five years ago. The biggest issue was it thrashing disk to read new points when you changed zoom level, that's where the SSD comes in.
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Mar 22, 2018 17:59
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infernal machines posted:yeah, i guess it comes down to what you want it for, i meant in terms of "thing i can plug in and use to make a 3d map of a space for very cheap" kinects aren't calibrated and don't hold calibrations well if you try iirc
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Mar 22, 2018 18:01
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Post-Sandy NOAA and USGS teamed up to do a full aerial LIDAR scan of NYC, so if you want to fuss around with a huge chunk data, go nuts: https://coast.noaa.gov/htdata/lidar1_z/geoid12b/data/4920/ After duct taping together a bunch of GIS apps developed by grad students, I got the data into a format I could use to do RF antenna coverage simulation and it was rad.
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Mar 22, 2018 18:01
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thats awesome
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Mar 22, 2018 18:03
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for generating point clouds, regular cameras end up working quite well if you fly them low enough in a drone or something. Quite a lot cheaper and more durable than LiDAR, and certainly accurate enough for DEMS or other municipal level stuff.
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Mar 22, 2018 18:06
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Low-Pass Filter posted:thats awesome
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Mar 22, 2018 18:06
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Jimmy Carter posted:Post-Sandy NOAA and USGS teamed up to do a full aerial LIDAR scan of NYC, so if you want to fuss around with a huge chunk data, go nuts: https://coast.noaa.gov/htdata/lidar1_z/geoid12b/data/4920/ back when i was practicing there i used the louisiana statewide lidar maps for ad-hoc topographic information before we could send the surveyors out to a site idk if they're still the only state that has them publicly available but they've certainly had them the longest
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Mar 22, 2018 18:06
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H.P. Hovercraft posted:back when i was practicing there i used the louisiana statewide lidar maps for ad-hoc topographic information before we could send the surveyors out to a site a few years back i heard that michigan had something like that in the works. haven’t seen it yet though.
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Mar 22, 2018 18:08
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Low-Pass Filter posted:kinects are cool as poo poo too, but they're not lidar. they project a specfic dot pattern in infrared onto things, then use a pair or IR cameras a set distance apart, then derive distance or depth using triangulation. that was how the first kinect for xbox 360 worked, the kinect 2 for xbox one was specifically described as a time of flight sensor
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Mar 22, 2018 18:09
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woah cool didnt know they made a 2.0. If they still have that decent SDK, i should pick one up to play with!
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Mar 22, 2018 18:19
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Low-Pass Filter posted:woah cool didnt know they made a 2.0. If they still have that decent SDK, i should pick one up to play with! they were packed with every xbone so they're probably pretty cheap
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Mar 22, 2018 18:22
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i think the v2 ones had hardware drm that specifically prevent them from being used as a standard usb device though
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Mar 22, 2018 18:26
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Low-Pass Filter posted:it doesn't meaure "brightness" at all; it measures the % amplitude of returned pulse. It uses this in conjunction with time of flight, and a shitload of DSP to determine if it's looking at something kind of reflective, or if it's shooting though, say, a bush, and each leaf will return part of the pulse. It can use this to return multiple "depths" from one pulse. It's real cool poo poo. I wonder if it would mess up on the bike wheels. like it would get signals from the spokes and rims but also the road behind it.
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Mar 22, 2018 18:31
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it would certainly get returns from the wheels/spokes as well as the road behind it. That doesn't mess it up in any way though; it would simply say "hey i got something that returned X% of the pulse at distance 10 meters (bike parts), and something that returned 80% of the pulse at 50 meters (road) or whatever. Do this tens of of thousands of times a second, and you can get a decent idea of whats there.
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Mar 22, 2018 18:41
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i'm glossing over stuff, in reality, you have to manage a bunch of specifications like beam width, field of view, number of lasers, type of lasers, angular resolution, what the expected range of objects is, refresh rate, rotation rate, and other stuff. certainly though, passing a bike wheel in front of a $80,000 lidar won't make it freak out. If it does, then, uh, they certainly shouldnt be used as mission critical sensors.
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Mar 22, 2018 18:45
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Improbable Lobster posted:they were packed with every xbone so they're probably pretty cheap except microsoft discontinued it. it feels like they kind of never really finished the product as a whole. the sdk is working but most tutorials on the net are not up-to-date. it's kind of hard to get started with it. also, since it's abandoned, most robotics labs are hoarding them and it's getting more and more difficult to find. especially the kinect v2 to PC adapter.
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Mar 22, 2018 18:53
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just strap shaggar to the front of your car, when you hear the 108 dB screeching, a bicycle is ahead
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Mar 22, 2018 18:58
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how exactly are these vehicles parsing and processing that amount of data quickly enough for it to be useful for driving?
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Mar 22, 2018 19:08
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Shifty Pony posted:how exactly are these vehicles parsing and processing that amount of data quickly enough for it to be useful for driving? as recent events have shown, not very well
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Mar 22, 2018 19:16
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Shifty Pony posted:how exactly are these vehicles parsing and processing that amount of data quickly enough for it to be useful for driving? lots of GPUs
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Mar 22, 2018 19:24
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Jonny 290 posted:just strap shaggar to the front of your car, when you hear the 108 dB screeching, a bicycle is ahead lmao
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Mar 22, 2018 19:25
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Shifty Pony posted:how exactly are these vehicles parsing and processing that amount of data quickly enough for it to be useful for driving? probably keeping a very narrow context and throwing tons of information away and hoping complex algorithms can make up for it
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Mar 22, 2018 19:27
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i remember years ago when lidar got cheaper our engineering department at my old job was really happy because they could just strap one on a truck and survey all kinds of information about our infrastructure just driving it down our routes
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Mar 22, 2018 19:29
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haveblue posted:that was how the first kinect for xbox 360 worked, the kinect 2 for xbox one was specifically described as a time of flight sensor yep and i only figured that out after i impulse bought a used kinect 1 at a pawn shop to play with, thinking it was the latter 
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Mar 22, 2018 19:33
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lancemantis posted:probably keeping a very narrow context and throwing tons of information away and hoping complex algorithms can make up for it so neural networks, then
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Mar 22, 2018 19:33
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